CN109239124A - The Artificial Frozen Soil and the coefficient experimental rig of the borehole wall and method of various soils - Google Patents
The Artificial Frozen Soil and the coefficient experimental rig of the borehole wall and method of various soils Download PDFInfo
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- CN109239124A CN109239124A CN201811027101.2A CN201811027101A CN109239124A CN 109239124 A CN109239124 A CN 109239124A CN 201811027101 A CN201811027101 A CN 201811027101A CN 109239124 A CN109239124 A CN 109239124A
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- 239000002689 soil Substances 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000007710 freezing Methods 0.000 claims abstract description 111
- 230000008014 freezing Effects 0.000 claims abstract description 111
- 238000012360 testing method Methods 0.000 claims abstract description 81
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 230000004308 accommodation Effects 0.000 claims abstract description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention provides the Artificial Frozen Soil and the coefficient experimental rig of the borehole wall and method of a kind of various soils.Device can freeze the soil body of Artificial Frozen Soil, simulate the experimental enviroment of coal mine shaft lining freezing process, it includes testing stand, cylinder, loading system, monitoring system and freezing system, testing stand provides installation space, the borehole wall of concrete is equipped in cylinder, accommodation space between cylinder and the borehole wall accommodates the soil body, loading system applies pressure to the soil body and the borehole wall, inside soil body is provided initially to press, freezing system freezes the soil body, temperature, the data of moisture and stress of monitoring system soil body of monitoring various soils during the soil body is frozen.The present invention is able to achieve the simulation of the experimental enviroment of coal mine shaft lining freezing process, data in simulation process handle and then obtained with the variation tendency of soil temperature, moisture, stress of various soils etc., and the variation that the borehole wall is displaced in simulation process, reference frame is provided for the further genralrlization experiment of freezing process.
Description
Technical field
The present invention relates to civil engineerings to test field, in particular to a kind of Artificial Frozen Soil of various soils is made jointly with the borehole wall
Experimental rig and method.
Background technique
Artificial stratum freezing process is to make the water freezing in stratum using artificial cooling technology, the soil body of natural rock is become
Frozen soil, increases its strength and stability, completely cuts off contacting for underground water and underground engineering, to guarantee mine shaft or underground engineering pick
Build the special constructional technique of construction.Frozen soil stratum is multiphase medium, moisture field, temperature field and stress in soil layer in freezing process
Sizable change occurs for field, and process is complicated and changeable, in order to guarantee the safe and reliable of construction, carries out effective model test
It probes into and seems very necessary.In actual formation, unconsolidated formation is since the period of experience is different, under long-term deposition, pine
It dissipates layer and is dispersed with heterogeneity rock-soil layer with buried depth interval macroscopic view, and these rock-soil layers respond each under identical congelation
It is different, freeze complexity difference, expansion characteristics difference, intuitively shows that the pressure on concrete walling is not quite similar, cause well
The inhomogeneities of pressure of freezing wall on wall influences the stability of the borehole wall, thus studies the collective effect of various soils frozen soil and the borehole wall
Also it seems very necessary.
Cause in borehole wall discontinuity and freezing zone about various soils frozen soil and the coefficient difference of the borehole wall at present
Water, heat, the test method of power THM coupling effect and not perfect, thus probe into a kind of various soils Artificial Frozen Soil and the borehole wall it is total
The model test apparatus and method of same-action are of great significance.
Summary of the invention
The purpose of the present invention is to provide a kind of Artificial Frozen Soil of various soils and the coefficient experimental rig of the borehole wall and
Method, the device can be realized quantitatively characterizing moisture field to the Artificial Frozen Soil of various soils during manual pipe jacking, temperature
And stress field variation tendency and the purpose of quantitative research is carried out with the difference of displacement caused by the borehole wall under collective effect.
To achieve the goals above, one aspect of the present invention provides the following technical solutions:
A kind of Artificial Frozen Soil of various soils and the coefficient experimental rig of the borehole wall, the experimental rig can freeze institute
The soil body for stating Artificial Frozen Soil, for simulating the experimental enviroment of coal mine shaft lining freezing process, including testing stand, cylinder, loading system, prison
Examining system and freezing system, wherein the soil body includes banketing there are many various soils, and the cylinder is placed in the testing stand
On, the borehole wall is arranged in the cylinder, and the top of the cylinder is provided with cover board, the borehole wall, the cylinder and described
Cover board surrounds accommodation space, and for the accommodation space for accommodating the soil body, the soil body is from top to bottom provided with multiple levels
Fill stratum, each fill stratum is provided with the earthen fill zones of multiple fan annulars, is filled with a kind of institute in each earthen fill zone
It states and bankets；The loading system includes reaction frame and hydraulic cylinder, and the top of the cylinder is arranged in the reaction frame, multiple described
The top of hydraulic cylinder is connect with the reaction frame, and the bottom end of multiple hydraulic cylinders is connect with the cover board, described hydraulic
Cylinder can be that the soil body applies pressure by the cover board；If the freezing system include refrigerator, inlet tube, outlet tube and
Dry freezing pipe, the freezing pipe are vertically arranged in the accommodation space, and the top of several freezing pipes both passes through described
Cover board is simultaneously connect by the inlet tube and the outlet tube with the refrigerator, described used for refrigerator low in generating and pumping
The medium of temperature, the refrigerator, the inlet tube, the freezing pipe, the outlet tube and the refrigerator are sequentially communicated to be formed
For the circulation loop of the medium, the medium carries out heat with the soil body in the freezing pipe and exchanges, for realizing
Freeze the soil body to form frost wall；The monitoring system includes several measurement external members, and several measurement external member settings exist
In the soil body, the measurement external member is made of temperature test element, moisture measurement element and stress test element, the monitoring
System can monitor temperature, moisture and the stress of the soil body by the measurement external member.
In experimental rig as described above, it is preferable that the periphery of the cylinder is provided with the ribbed stiffener of a plurality of annular；Institute
The periphery for stating cylinder top has been placed equidistant with multiple links；Purlin vehicle is provided on the testing stand, the purlin vehicle can pass through institute
It states link and hangs the cylinder；The borehole wall is concrete structure, and the top and bottom end of the borehole wall are provided with sealing ring；Institute
It states cover board and is provided with centre bore, the cover board can cover the sealing ring of the soil body and the borehole wall top, the lid
Plate can move up and down, and the hydraulic cylinder can apply the soil body and the borehole wall by the cover board and the sealing ring
Pressure.
In experimental rig as described above, it is preferable that the fill stratum is provided with three layers altogether, is followed successively by from top to bottom
One fill stratum, the second fill stratum, third fill stratum are additionally provided with padding layer above first fill stratum, described
It is additionally provided with insulating layer below three fill stratums, between the padding layer and first fill stratum, two adjacent described fills out
Geomembrane is provided between soil layer, between the insulating layer and the third fill stratum；It is arranged between the adjacent earthen fill zone
There is geomembrane；Surface is surveyed in the cylinder and is provided with vertical graduation mark, and each described fill out can be controlled by the graduation mark
The thickness of the layer；Preferably, the material of the padding layer and the insulating layer is clay；Preferably, described banket includes
Three kinds of various soils banket, respectively high-expansion calcareous clay, low expansion sandy clay and sand, each described to banket
Layer is divided into three earthen fill zones and bankets described in being respectively filled in three kinds, same described to banket in the different fill stratums
Position is not overlapped.
In experimental rig as described above, it is preferable that the loading system further includes load controller, the load control
Instrument processed is connect by data line with the hydraulic cylinder, for controlling the loading speed and load of the hydraulic cylinder；The reaction frame
Including load bearing beam and column, the load bearing beam is horizontally set on the top of the cover board, and the load bearing beam is mutually perpendicular to by two
The crossbeam of intersection is constituted, and the length of the crossbeam is greater than the outer diameter of the cylinder, and the top of the column and the load bearing beam connect
It connects, the bottom end of the column passes through the cover board and the borehole wall and is fixedly connected with the testing stand, every crossbeam
Two ends are provided with two high-strength bolts, and the bottom end of the high-strength bolt is fixedly connected with the testing stand, described high-strength
The top of screw rod passes through the crossbeam, is arranged with nut on the high-strength bolt of the crossbeam, the nut with it is described
High-strength bolt is threadedly coupled, and is screwed the nut and is capable of fixing the load bearing beam；There are four the hydraulic cylinder settings, in a ring
Even distribution is additionally provided with bearing plate, the upper surface of the bearing plate and the carrying between the hydraulic cylinder and the load bearing beam
The lower surface of beam abuts, and the piston rod of four hydraulic cylinders is abutted with the lower surface of the bearing plate.
In experimental rig as described above, it is preferable that the freezing pipe is provided with three circles altogether in the accommodation space,
Respectively inner ring, centre circle and outer ring, the inner ring, the centre circle and the outer ring are respectively arranged with several freezing pipes and wait
Away from distribution；Preferably, the inner ring is at a distance from the borehole wall, the distance between the inner ring and the centre circle, the centre circle
The distance between described outer ring is 15cm；Preferably, the freezing pipe is provided with 18 in the inner ring；Preferably, institute
It states freezing pipe and the centre circle is provided with 30；Preferably, the freezing pipe is provided with 42 in the outer ring.
In experimental rig as described above, it is preferable that middle part and position in the short transverse of each fill stratum
In being provided with multiple measuring points on the center line of each earthen fill zone；Preferably, it is arranged on the center line of each earthen fill zone
There are five the measuring point, between the borehole wall and the inner ring, between the inner ring and the centre circle and the centre circle and institute
It states and is respectively arranged with the measuring point between outer ring, the measuring point there are two settings between the outer ring and the cylinder, five
A measuring point is equally spaced, and the measurement external member is provided on each measuring point；Preferably, the temperature test
Element is thermocouple string；Preferably, the moisture measurement element is moisture transducer.
In experimental rig as described above, it is preferable that the monitoring system further includes temperature data acquisition instrument, water fraction
According to Acquisition Instrument, stress data acquisition instrument, the temperature data acquisition instrument and the temperature test element, moisture data acquisition
Instrument passes through survey line with the stress test element with the moisture measurement element, the stress data acquisition instrument and connects；It is described
Temperature data acquisition instrument can acquire the temperature data of the soil body, moisture data acquisition by the temperature test element
Instrument can acquire the moisture data of the soil body by the moisture measurement element, the stress data acquisition instrument can pass through institute
State the stress data that stress test element acquires the soil body；The temperature data acquisition instrument, the stress data acquisition instrument and
The moisture data Acquisition Instrument passes through data line and connect with computer, and the computer is able to record and handles the temperature data and adopts
Collect instrument, the stress data acquisition instrument and the moisture data Acquisition Instrument data collected.
In experimental rig as described above, it is preferable that the monitoring system further includes having displacement acquisition element and displacement
Data collecting instrument, the displacement data Acquisition Instrument and the displacement acquisition element are connected by survey line, are banketed described in each
It is provided with the displacement acquisition element on the surface surveyed on the extended line of zone centerline and in the borehole wall, it is described
Displacement data Acquisition Instrument can acquire the displacement data of the borehole wall by the displacement acquisition element；The displacement data acquisition
Instrument is connect by data line with computer, and the computer is able to record and handles the displacement data Acquisition Instrument data collected.
In experimental rig as described above, it is preferable that the freezing system further includes feed liquor current divider and liquid shunts out
Device, the feed liquor current divider are arranged between the inlet tube and the freezing pipe, and the feed liquor current divider can make to be given an account of
Matter uniformly flows into each freezing pipe, and the liquid current divider out is arranged between the outlet tube and the freezing pipe, described
Liquid current divider can assemble the medium in the cryovial and be output to outlet tube out；The freezing pipe is by inner tube and is arranged
Outer tube in said inner tube periphery forms, and said inner tube is connected to the outer tube in the bottom of the freezing pipe, said inner tube
Top be connected to by the feed liquor current divider with the inlet tube, the top of the outer tube pass through described in out liquid current divider with it is described
Outlet tube connection；The medium is CaCl2Solution and/or alcohol.
On the other hand it provides and a kind of carries out various soils Artificial Frozen Soil and borehole wall collective effect using above-mentioned experimental rig
The method of test comprising following steps: (1) the displacement likelihood ratio, the time likelihood ratio, the temperature likelihood ratio, thermal coefficient phase are determined
Like than, the coefficient of heat conduction likelihood ratio, the heat flow likelihood ratio, the refrigerant agent flow velocity likelihood ratio, coagulation body wall strength design；(2) will
All freezing pipes predefine good position and are fixed, and prevent freezing pipe position during banketing from shifting；(3) will justify
Cylinder is hung on testing stand by purlin vehicle, and the borehole wall is placed in cylinder and cylinder and the borehole wall is arranged in concentric circles, at cylinder bottom
Sealing is arranged in portion, and the freezing pipe of three coil structures fixed in the step (2) is placed between cylinder and the borehole wall, according to filling out
Soil layer and the design form of earthen fill zone banket, and are constantly vibrated during banketing to guarantee that soil layer is closely knit, are filled out in adjacent
The geomembrane of waterproof is respectively provided between soil layer and between adjacent earthen fill zone to eliminate the water between each fill stratum and earthen fill zone
Divide migration, while five measuring points are set on the center line of each earthen fill zone, is arranged on measuring point by temperature test element, moisture
The measurement external member of testing element and stress test element composition, respectively by temperature test element and temperature data acquisition instrument, moisture
Testing element is attached with moisture data Acquisition Instrument, stress test element and stress data acquisition instrument by data lines,
On the inner wall of the borehole wall and be located at each earthen fill zone center line on be respectively provided with a displacement acquisition element, by displacement acquisition element with
Displacement data Acquisition Instrument is connected by data lines, by temperature data acquisition instrument, moisture data Acquisition Instrument, stress data acquisition instrument
It is connect by data line with computer with displacement data Acquisition Instrument, after the completion of banketing, cover board is placed on cylinder；It (4) will load
System is arranged outside cylinder, in the surface plastic covering foam of cylinder；(5) monitoring system is debugged, confirms temperature test
After element, moisture measurement element and stress test element work normally, start-up loading system is gradually forced into stress design calculating
Value, and stablize preset time；(6) simulation is freezed, and adjusting control freezing system makes Frozen wall thickness reach design value, is entirely freezing
During knot, by temperature data acquisition instrument, moisture data Acquisition Instrument, stress data acquisition instrument and displacement data Acquisition Instrument to soil
The temperature of body, moisture, stress and the data of borehole wall displacement carry out data acquisition, acquisition time are as follows: the initial stage of freezing every
10min acquisition is primary, primary every 30min acquisition freezing the later period；(7) when formed stablize frost wall, in earthen fill zone temperature and
Data acquisition after moisture content does not change, thaws to frost wall, removes experimental rig.
Analysis is it is found that the present invention discloses Artificial Frozen Soil and the coefficient experimental rig of the borehole wall and the side of a kind of various soils
Method, the experimental rig can freeze the soil body of Artificial Frozen Soil, for simulating the experimental enviroment of coal mine shaft lining freezing process, including test
Platform, cylinder, loading system, monitoring system and freezing system, testing stand are used to provide installation space for the experimental rig, in cylinder
Be provided with the borehole wall of concrete, the accommodation space between cylinder and the borehole wall for accommodating the soil body, loading system can to the soil body and
The borehole wall applies pressure, initially presses for providing inside soil body with simulating the deep soil layer in coal mine shaft lining freezing process pressure ring
Border, freezing system can freeze the soil body to form frost wall, and monitoring system can monitor different soil during the soil body is frozen
Temperature, the data of moisture and stress of the soil body of property, the collective effect that monitoring system can also monitor the various soils soil body are gone into the well
The difference being displaced caused by each position of wall.
The present invention can to during manual pipe jacking the temperature of the soil body of various soils, moisture, stress and the borehole wall position
The monitoring of the data of shifting is realized the simulation of the experimental enviroment of coal mine shaft lining freezing process, is handled the data in simulation process
It obtains the variation tendency of soil temperature, moisture, stress (water, heat, power THM coupling) of various soils etc. in turn and the borehole wall exists
The variation being displaced in simulation process carries out comprehensive and systematic research to artificial stratum freezing process, is the further genralrlization of freezing process
Experiment provides reference frame.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.Wherein:
Fig. 1 is the vertical cross-section schematic diagram of one embodiment of the invention；
Fig. 2 is the stereoscopic schematic diagram of the cylinder of one embodiment of the invention；
Fig. 3 is the stereoscopic schematic diagram of the borehole wall of one embodiment of the invention；
Fig. 4 is the schematic top plan view of the cover board of one embodiment of the invention；
Fig. 5 is the transverse sectional view of the earthen fill zone of one embodiment of the invention；
Fig. 6 is the transverse sectional view of the fill stratum of one embodiment of the invention；
Fig. 7 is the point layout vertical cross-section schematic diagram of one embodiment of the invention；
Fig. 8 is the arrangement schematic diagram of banketing of the earthen fill zone of first fill stratum of one embodiment of the invention；
Fig. 9 is the arrangement schematic diagram of banketing of the earthen fill zone of second fill stratum of one embodiment of the invention；
Figure 10 is the arrangement schematic diagram of banketing of the earthen fill zone of the third fill stratum of one embodiment of the invention；
Figure 11 is the measurement external member structural schematic diagram of one embodiment of the invention.
Description of symbols: 1 testing stand；2 purlin vehicles；3 convex edges；4 cylinders；5 boreholes wall；6 cover boards；7 through-holes；8 fairleads；In 9
Heart hole；10 ribbed stiffeners；11 first fill stratums；12 second fill stratums；13 third fill stratums；14 sealing rings；15 padding layers；16 heat preservations
Layer；17 geomembranes；18 reaction frames；19 load bearing beams；20 columns；21 high-strength bolts；22 bearing plates；23 nuts；24 hydraulic cylinders；25 add
Carry controller；26 measurement external members；27 temperature test elements；28 moisture measurement elements；29 stress test elements；30 temperature datas are adopted
Collect instrument；31 moisture data Acquisition Instruments；32 stress data acquisition instrument；33 displacement data Acquisition Instruments；34 displacement acquisition elements；35 freezings
Machine；36 freezing pipes；37 inner rings；38 centre circles；39 outer rings.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.The explanation of each example through the invention
Mode, which provides, to be not intended to limit the present invention.In fact, those skilled in the art will be clear that, the scope of the present invention or essence are not being departed from
In the case where mind, it can modify in the present invention and modification.For example, being illustrated or described as the spy of a part of one embodiment
Sign can be used for another embodiment, to generate another embodiment.Thus, it may be desirable to which the present invention includes to be included into appended power
Such modifications and variations in the range of benefit requirement and its equivalent.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention that must be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.Term used in the present invention " connected ", " connection ", " setting " shall be understood in a broad sense, for example, it may be solid
Fixed connection, may be a detachable connection；It can be directly connected, can also be indirectly connected by intermediate member；It can be
Line electrical connection, radio connection are also possible to wireless communication signals connection, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
As shown in Figure 1 to 11, according to an embodiment of the invention, providing the Artificial Frozen Soil and the borehole wall of a kind of various soils
Coefficient experimental rig, the experimental rig can freeze the soil body of Artificial Frozen Soil, for simulating coal mine shaft lining freezing process
Experimental enviroment, including testing stand 1, cylinder 4, loading system, monitoring system and freezing system, wherein
The soil body includes banketing there are many various soils, and testing stand 1 is used to provide installation space for the experimental rig, preferably
For sinking space, the two sides of testing stand 1 are provided with convex edge 3, and convex edge 3 extends to the two sides of testing stand 1 in the horizontal direction, cylinder 4
It is placed on testing stand 1, cylinder 4 is the cylindrical structure of top end opening, and the borehole wall 5 is arranged in cylinder 4, and the borehole wall 5 and cylinder 4 are in same
The heart justifies structure setting, and the top of cylinder 4 is provided with cover board 6, and the receiving that the borehole wall 5, cylinder 4 and cover board 6 surround torus structure is empty
Between, accommodation space is for accommodating the soil body, and the soil body is from top to bottom provided with the fill stratum of multiple levels, and each fill stratum is provided with
It is multiple to fan annular earthen fill zones, one kind, which is filled with, in each earthen fill zone bankets.
Loading system includes reaction frame 18 and hydraulic cylinder 24, and reaction frame 18 is arranged on testing stand 1 and is located at the upper of cylinder 4
Side, the top of multiple hydraulic cylinders 24 are connect with reaction frame 18, and the bottom end of multiple hydraulic cylinders 24 is connect with cover board 6, hydraulic cylinder
24 can be that the soil body applies pressure by cover board 6, initially press for providing inside soil body to simulate in coal mine shaft lining freezing process
Deep soil layer ground pressure ring border, practical overburden soil in the coal mine shaft lining that the value of 24 pressure applied of hydraulic cylinder is simulated for the device
The value of the self weight of layer.
Freezing system includes refrigerator 35, inlet tube, outlet tube and several freezing pipes 36, and freezing pipe 36 is vertically arranged to
In accommodation space, be provided with several through-holes 7 on cover board 6, the top of each freezing pipe 36 both pass through after the through-hole 7 of cover board 6 with into
Liquid pipe is connected with outlet tube, and inlet tube and outlet tube are connect with refrigerator 35, and refrigerator 35 is for generating and pumping low temperature
Medium, refrigerator 35, inlet tube, freezing pipe 36, outlet tube and refrigerator 35 are sequentially communicated the circulation loop to be formed for medium,
Medium carries out heat with the soil body in freezing pipe 36 and exchanges, for realizing the soil body is freezed to form frost wall, medium CaCl2It is molten
Liquid and/or alcohol, it is preferable that medium is alcohol.
It is provided with several measurement external members 26 in the soil body, measures external member 26 by temperature test element 27, moisture measurement element 28
It is constituted with stress test element 29, monitoring system can monitor temperature, moisture and the stress of the soil body by measurement external member 26.
Further, as shown in Fig. 2, the material of cylinder 4 is 45#Steel, the periphery of cylinder 4 are provided with putting more energy into for a plurality of annular
Rib 10, it is preferable that ribbed stiffener 10 is provided with three, and the setting of ribbed stiffener 10 can increase the intensity of cylinder 4.4 top of cylinder
Periphery has been placed equidistant with multiple links, it is preferable that there are four link settings.Purlin vehicle 2, the bottom end of purlin vehicle 2 are provided on testing stand 1
It is fixed on the convex edge 3 of 1 two sides of testing stand, purlin vehicle 2 can hang cylinder 4 by link.As shown in figure 3, the borehole wall 5 is mixed
Xtah Crude Clay structure, the top and bottom end of the borehole wall 5 are provided with sealing ring 14, it is preferable that the material of sealing ring 14 is rubber.
The diameter of cover board 6 is equal with the internal diameter of cylinder 4, and several through-holes 7 are provided on cover board 6, and through-hole 7 freezes for installing
Pipe 36, the position of through-hole 7 and quantity are consistent with the position of freezing pipe 36 and quantity, and fairlead 8, fairlead 8 are provided on cover board
Draw for passing through the survey line connecting in cylinder 4 with temperature test element 27, moisture measurement element 28 and stress test element 29
String holes 8 draw cylinder 4 it is outer and respectively with temperature data acquisition instrument 30, moisture data Acquisition Instrument 31 and stress data acquisition instrument 32 into
Row connection, cover board 6 are provided centrally with centre bore 9, and the diameter of centre bore 9 is equal with the internal diameter of the borehole wall 5, and cover board 6 can cover
The sealing ring 14 on 5 top of the soil body and the borehole wall, cover board 6 can move up and down, and hydraulic cylinder 24 can be right by cover board 6 and sealing ring 14
The soil body and the borehole wall 5 apply pressure.The periphery of cylinder 4 is provided with plastic foam, and the setting of plastic foam is able to maintain in cylinder 4
Temperature.
Further, fill stratum is provided with three layers altogether, be followed successively by from top to bottom the first fill stratum 11, the second fill stratum 12,
Third fill stratum 13 is additionally provided with padding layer 15 in the top of the first fill stratum 11, it is preferable that the material of padding layer 15 is glutinous
The effect of soil, padding layer 15 is water proof and the basis as experimental material, is additionally provided with heat preservation in the lower section of third fill stratum 13
Layer 16, it is preferable that the material of insulating layer 16 is clay, and insulating layer 16 can prevent in freezing process cooling capacity from the top of cylinder 4
Be lost, between padding layer 15 and the first fill stratum 11, between two adjacent fill stratums, insulating layer 16 and third fill stratum 13 it
Between be provided with geomembrane 17, geomembrane 17 is provided between adjacent earthen fill zone, geomembrane 17 can be effectively prevented in the soil body
Migration of the moisture between each earthen fill zone and fill stratum.
Surface is surveyed in cylinder 4 and is provided with vertical graduation mark, and the thickness of each fill stratum can be controlled by graduation mark, it is excellent
Selection of land, in 35cm or more, the thickness of fill stratum determines the thickness of fill stratum (11,12,13) according to the height of experimental box body, bankets
The more thick and solid stability tested of layer is better, error is smaller；The thickness of padding layer 15 and insulating layer 16 is 25cm or more.
Preferably, it bankets there are three types of settings, respectively high-expansion calcareous clay A, low expansion sandy clay B and sand
C, as shown in Figure 5 and Figure 6, each fill stratum is divided into the earthen fill zones of three fan annulars, and (central angle of each earthen fill zone is
120 °), respectively the first earthen fill zone, the second earthen fill zone, third earthen fill zone, each earthen fill zone inserts one kind and bankets, same to fill out
Soil is not overlapped in the position of different fill stratums.
Specifically, as shown in figure 8, three kinds banket in the first fill stratum 11 first earthen fill zone 1., the second earthen fill zone 2.,
The filling sequence of three earthen fill zones 3. is A, B, C.As shown in figure 9, three kinds are banketed
In second fill stratum 12 first earthen fill zone 1., the second earthen fill zone 2., third earthen fill zone 3. filling sequence be C, A,
B.As shown in Figure 10, three kinds banket in third fill stratum 13 first earthen fill zone 1., the second earthen fill zone 2., third earthen fill zone 3.
Filling sequence is B, C, A.
Further, loading system further includes load controller 25, and load controller 25 passes through data line and hydraulic cylinder 24
Connection, for controlling the loading speed and load of hydraulic cylinder 24.
Reaction frame 18 includes load bearing beam 19 and column 20, and load bearing beam 19 is horizontally set on the top of cover board 6, load bearing beam 19 by
Two are mutually perpendicular to the crossbeam intersected and constitute, and the length of crossbeam is greater than the outer diameter of cylinder 4, and the top of column 20 and load bearing beam 19 connect
It connects, the bottom end of column 20 passes through cover board 6 and the borehole wall 5 and is fixedly connected with testing stand 1, and two ends of every crossbeam are provided with
The bottom end of two high-strength bolts 21, high-strength bolt 21 is fixedly connected with testing stand 1, and the top of high-strength bolt 21 passes through crossbeam, is worn
It crosses on the high-strength bolt 21 of crossbeam and is arranged with nut 23, nut 23 is threadedly coupled with high-strength bolt 21, and tightening nuts 23 can be consolidated
Determine load bearing beam 19.
There are four the settings of hydraulic cylinder 24, rounded to be uniformly distributed, and is additionally provided with pressure-bearing between hydraulic cylinder 24 and load bearing beam 19
Plate 22, because the distribution comparatively dense of several freezing pipes 36 and freezing pipe 36 is distributed on cover board 6, since freezing pipe 36 necessarily has one
The top that segment is exposed to cover board 6 leads to the load of inconvenient hydraulic cylinder 24, so need to be arranged bearing plate 22, bearing plate 22
Specific height is determined according to physical device mounting height, i.e., adds according to the height between reaction frame 18 and cover board 6 is corresponding.Pressure-bearing
The setting of plate 22 can facilitate the load of hydraulic cylinder 24, and the upper surface of bearing plate 22 is abutted with the lower surface of load bearing beam 19, four liquid
The piston rod of cylinder pressure 24 is abutted with the lower surface of bearing plate 22, it is preferable that the material of bearing plate 22 is Q235 steel, Q235 steel
With preferable crushing resistance.
Further, freezing pipe 36 is provided with three circles, respectively inner ring 37, centre circle 38 and outer ring altogether in accommodation space
39, inner ring 37, centre circle 38 and outer ring 39 are respectively arranged with several freezing pipes 36 and are equally spaced.Preferably, inner ring 37 and the borehole wall 5
The distance between distance, inner ring 37 and centre circle 38, the distance between centre circle 38 and outer ring 39 be 15cm.Preferably, freeze
Pipe 36 inner ring 37 be provided with 18, freezing pipe 36 centre circle 38 be provided with 30, freezing pipe 36 outer ring 39 is provided with 42.
Further, as shown in fig. 7, at the middle part in the short transverse of each fill stratum and being located in each earthen fill zone
Multiple measuring points are provided on heart line, it is preferable that on the center line of each earthen fill zone setting there are five measuring point, the borehole wall 5 with it is interior
Between circle 37, a measuring point, outer ring 39 and circle are respectively arranged between inner ring 37 and centre circle 38 between centre circle 38 and outer ring 39
Setting is there are two measuring point between cylinder 4, and five measuring points are equally spaced on each measuring point and are provided with measurement external member 26.
Preferably, temperature test element 27 is that constantan-copper thermocouple string, moisture measurement element 28 are moisture transducer, answer
Power testing element 29 is stress meter.
Further, monitoring system further includes temperature data acquisition instrument 30, moisture data Acquisition Instrument 31, stress data acquisition
Instrument 32, temperature data acquisition instrument 30 and temperature test element 27, moisture data Acquisition Instrument 31 and moisture measurement element 28, stress number
It is connected by survey line according to Acquisition Instrument 32 with stress test element 29；
Temperature data acquisition instrument 30 can acquire the temperature data of the soil body by temperature test element 27, moisture data acquires
Instrument 31 can acquire the moisture content data of the soil body by moisture measurement element 28, stress data acquisition instrument 32 can pass through stress
The stress data of the acquisition soil body of testing element 29；
Temperature data acquisition instrument 30, stress data acquisition instrument 32 and moisture data Acquisition Instrument 31 pass through data line and computer
Connection, computer is able to record and 31 institute for the treatment of temperature data collecting instrument 30, stress data acquisition instrument 32 and moisture data Acquisition Instrument
The data of acquisition handle quantitatively characterizing moisture of the soil body that can obtain various soils during manual pipe jacking by computer
The variation tendency of field, temperature field and stress field.
Preferably, temperature data acquisition instrument 30 and stress data acquisition instrument 32 select TDS630 data collecting instrument.
Further, as shown in fig. 7, monitoring system further includes having displacement acquisition element 34 and displacement data Acquisition Instrument 33,
Displacement data Acquisition Instrument 33 is connected with displacement acquisition element 34 by survey line, on the extended line of each zone centerline of banketing and
A displacement acquisition element 34 is provided on the surface surveyed in the borehole wall 5, and (i.e. displacement acquisition elements 34 are total is provided with 9
A, corresponding one of each earthen fill zone), each displacement acquisition element 34 is respectively positioned on that earthen fill zone is corresponding to be filled out in the height direction
The middle part of soil layer, displacement data Acquisition Instrument 33 can acquire the displacement data of the borehole wall 5 by displacement acquisition element 34, it is preferable that
Displacement acquisition element 34 is displacement meter.
Displacement data Acquisition Instrument 33 is connect by data line with computer, and computer is able to record and handles displacement data Acquisition Instrument
33 data collected can obtain during manual pipe jacking by the processing of computer in the collective effect of the various soils soil body
The difference being displaced caused by each position of the lower borehole wall 5.
Further, freezing system further includes feed liquor current divider and liquid current divider, feed liquor current divider are arranged in inlet tube out
Between freezing pipe 36, feed liquor current divider can make homogeneous media flow into each freezing pipe 36, and liquid current divider is arranged in liquid out out
Between pipe and freezing pipe 36, the media aggregates in cryovial can be got up and be delivered to outlet tube by liquid current divider out.
Freezing pipe 36 is made of inner tube with the outer tube for being sheathed on inner tube periphery, and inner and outer tubes connect in the bottom of freezing pipe 36
Logical, the top of inner tube is connected to by feed liquor current divider with inlet tube, and the top of outer tube is connected to by going out liquid current divider with outlet tube.
Freezing pipe 36, inlet tube and the outlet tube being preferably located at outside cylinder 4 are closely wound with thermal insulation material, to subtract
Few cooling capacity is lost.
Various soils Artificial Frozen Soil and borehole wall collective effect are carried out using above-mentioned experimental rig the invention also discloses a kind of
The method of test, includes the following steps:
(1) determine that geometric similarity ratio, the time likelihood ratio, the temperature likelihood ratio, the thermal coefficient likelihood ratio, the coefficient of heat conduction are similar
Than, the heat flow likelihood ratio, the refrigerant agent flow velocity likelihood ratio, 5 Intensity Design of the coagulation body borehole wall, design value is according to practical cabinet herein
Other the corresponding likelihood ratio (geometric similarity ratio C are determined again with after the comprehensive determining geometric similarity ratio of experiment porchl, time likelihood ratio Cτ=
Cl 2, temperature likelihood ratio Cθ=1, the thermal coefficient likelihood ratioThe heat transfer likelihood ratioHeat flow likelihood ratio CQ
=Cl 2, refrigerant agent flow velocity v '=ClV, concrete strength likelihood ratio Cl)；
(2) after all freezing pipes 36 being predefined good position, 36 opsition dependent of freezing pipe is fixed on bamboo pole, prevents from filling out
36 position of freezing pipe shifts during soil, is filled to dismounting bamboo pole at corresponding elevation wait banket；
(3) cylinder 4 is hung on testing stand 1 by purlin vehicle 2, the borehole wall 5 is placed in cylinder 4 and makes cylinder 4 and the borehole wall 5
It is arranged in concentric circles, sealing (can be laid with sealing with geomembrane 17) is set in 4 bottom of cylinder, by what is fixed in step (2)
The freezing pipe 36 of three coil structures is placed between cylinder 4 and the borehole wall 5, is filled out according to the design form of fill stratum and earthen fill zone
Soil is constantly vibrated during banketing and (manually treads and be aided with simple ballast consolidating machine) to guarantee that soil layer is closely knit, banketed in adjacent
The geomembrane 17 of waterproof is respectively provided between layer and between adjacent earthen fill zone to eliminate the water between each fill stratum and earthen fill zone
Divide migration, while five measuring points are set on the center line of each earthen fill zone, is arranged on measuring point by temperature test element 27, water
The measurement external member 26 for dividing testing element 28 and stress test element 29 to form, respectively adopts temperature test element 27 with temperature data
Collection instrument 30, moisture measurement element 28 pass through with moisture data Acquisition Instrument 31, stress test element 29 and stress data acquisition instrument 32
Data lines are attached, and are respectively provided with a displacement acquisition on the inner wall of the borehole wall 5 and on the center line of each earthen fill zone
Displacement acquisition element 34 is connect with displacement data Acquisition Instrument 33 by data lines by element 34, by temperature data acquisition instrument 30,
Moisture data Acquisition Instrument 31, stress data acquisition instrument 32 and displacement data Acquisition Instrument 33 are connect by data line with computer, wait fill out
After the completion of soil, cover board 6 is placed on cylinder 4；
(4) loading system is arranged outside cylinder 4, in the surface plastic covering foam of cylinder 4；
(5) monitoring system is debugged, confirms temperature test element 27, moisture measurement element 28, stress test element
29 and after displacement acquisition element 34 works normally, start-up loading system is gradually forced into stress design calculated value, and stablizes default
Time (at least stablizes 24 hours)；
(6) simulation is freezed, and adjusting control freezing system makes Frozen wall thickness reach design value (outermost and innermost layer measuring point temperature
Degree is reduced to -2 DEG C or less), in entire freezing process, pass through temperature data acquisition instrument 30, moisture data Acquisition Instrument 31, stress
The data that data collecting instrument 32 and displacement data Acquisition Instrument 33 are displaced the temperature of the soil body, moisture, stress and the borehole wall 5 count
According to acquisition, acquisition time are as follows: it is primary every 10min acquisition at the initial stage of freezing, it is primary every 30min acquisition freezing the later period；
(7) data acquisition after temperature and moisture content do not change in the stable frost wall of formation, earthen fill zone, it is right
Frost wall thaws, and removes experimental rig.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
A kind of Artificial Frozen Soil of various soils and the coefficient experimental rig of the borehole wall 5 and method, which can
The soil body for freezing Artificial Frozen Soil, for simulating the experimental enviroment of coal mine shaft lining freezing process, including testing stand 1, cylinder 4, load system
System, monitoring system and freezing system, testing stand 1 are used to provide installation space for the experimental rig, are provided with concrete in cylinder 4
The borehole wall 5, accommodation space between cylinder 4 and the borehole wall 5 can apply the soil body and the borehole wall 5 for accommodating the soil body, loading system
Pressure is initially pressed for providing inside soil body with simulating the deep soil layer in coal mine shaft lining freezing process pressure ring border, freeze be
System can freeze the soil body to form frost wall, and monitoring system can monitor the soil body of various soils during the soil body is frozen
The data of temperature, moisture and stress, monitoring system can also monitor each position of the borehole wall 5 under the collective effect of the various soils soil body
The difference being displaced caused by setting.
The present invention can to during manual pipe jacking the temperature of the soil body of various soils, moisture, stress and the borehole wall 5 position
The monitoring of the data of shifting is realized the simulation of the experimental enviroment of coal mine shaft lining freezing process, is handled the data in simulation process
And then obtain the variation tendency and the borehole wall 5 of soil temperature, moisture, stress (water, heat, power THM coupling) of various soils etc.
The variation tendency being displaced in simulation process carries out comprehensive and systematic research to artificial stratum freezing process, is freezing process into one
Step promotes experiment and provides reference frame.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Artificial Frozen Soil of various soils and the coefficient experimental rig of the borehole wall, the experimental rig can freeze described
The soil body of Artificial Frozen Soil, for simulating the experimental enviroment of coal mine shaft lining freezing process, which is characterized in that including testing stand, cylinder, add
Loading system, monitoring system and freezing system, wherein
The soil body includes banketing there are many various soils, and the cylinder is placed on the testing stand, and the borehole wall setting exists
In the cylinder, the top of the cylinder is provided with cover board, and the borehole wall, the cylinder and the cover board surround accommodation space,
For the accommodation space for accommodating the soil body, the soil body is from top to bottom provided with the fill stratum of multiple levels, each described
Fill stratum is provided with the earthen fill zone of multiple fan annulars, is filled with described in one kind and bankets in each earthen fill zone；
The loading system includes reaction frame and hydraulic cylinder, and the top of the cylinder, multiple liquid are arranged in the reaction frame
The top of cylinder pressure is connect with the reaction frame, and the bottom end of multiple hydraulic cylinders is connect with the cover board, the hydraulic cylinder
It can be that the soil body applies pressure by the cover board；
The freezing system includes refrigerator, inlet tube, outlet tube and several freezing pipes, and the freezing pipe is vertically arranged to institute
State in accommodation space, the top of several freezing pipes both pass through the cover board and by the inlet tube and the outlet tube with
The refrigerator connection, it is described used for refrigerator in the medium for generating and pumping low temperature, the refrigerator, the inlet tube, institute
It states freezing pipe, the outlet tube and the refrigerator and is sequentially communicated the circulation loop to be formed for the medium, the medium exists
It carries out heat with the soil body in the freezing pipe to exchange, for realizing the soil body is freezed to form frost wall；
The monitoring system includes several measurement external members, and several measurement external members are arranged in the soil body, the measuring unit
Part is made of temperature test element, moisture measurement element and stress test element, and the monitoring system can pass through the measurement
External member monitors temperature, moisture and the stress of the soil body.
2. experimental rig according to claim 1, which is characterized in that
The periphery of the cylinder is provided with the ribbed stiffener of a plurality of annular；
The periphery on the cylinder top has been placed equidistant with multiple links；
Purlin vehicle is provided on the testing stand, the purlin vehicle can hang the cylinder by the link；
The borehole wall is concrete structure, and the top and bottom end of the borehole wall are provided with sealing ring；
The cover board is provided with centre bore, and the cover board can cover the sealing ring of the soil body and the borehole wall top,
The cover board can move up and down, and the hydraulic cylinder can be by the cover board and the sealing ring to the soil body and the well
Wall applies pressure.
3. experimental rig according to claim 1, which is characterized in that
The fill stratum is provided with three layers altogether, is followed successively by the first fill stratum, the second fill stratum, third fill stratum from top to bottom,
It is additionally provided with padding layer above first fill stratum, is additionally provided with insulating layer below the third fill stratum, it is described
Between padding layer and first fill stratum, between two adjacent fill stratums, the insulating layer bankets with the third
Geomembrane is provided between layer；
Geomembrane is provided between the adjacent earthen fill zone；
Surface is surveyed in the cylinder and is provided with vertical graduation mark, and each fill stratum can be controlled by the graduation mark
Thickness；
Preferably, the material of the padding layer and the insulating layer is clay；
Preferably, described to banket including banketing there are three types of various soils, respectively high-expansion calcareous clay, low expansion sand
Matter clay and sand, each fill stratum is divided into three earthen fill zones and bankets described in being respectively filled in three kinds, same
Described banket is not overlapped in the position of the different fill stratums.
4. experimental rig according to claim 1, which is characterized in that
The loading system further includes load controller, and the load controller is connect by data line with the hydraulic cylinder, is used
In the loading speed and load that control the hydraulic cylinder；
The reaction frame includes load bearing beam and column, and the load bearing beam is horizontally set on the top of the cover board, the load bearing beam
The crossbeam for being mutually perpendicular to intersect by two is constituted, and the length of the crossbeam is greater than the outer diameter of the cylinder, the top of the column
It being connect with the load bearing beam, the bottom end of the column passes through the cover board and the borehole wall and is fixedly connected with the testing stand,
Two ends of the every crossbeam are provided with two high-strength bolts, and the bottom end of the high-strength bolt is fixed with the testing stand
The top of connection, the high-strength bolt passes through the crossbeam, is arranged with nut on the high-strength bolt of the crossbeam, institute
It states nut to be threadedly coupled with the high-strength bolt, screws the nut and be capable of fixing the load bearing beam；
There are four the hydraulic cylinder settings, is uniformly distributed in a ring, is additionally provided with and holds between the hydraulic cylinder and the load bearing beam
Pressing plate, the upper surface of the bearing plate are abutted with the lower surface of the load bearing beam, the piston rod of four hydraulic cylinders with it is described
The lower surface of bearing plate abuts.
5. experimental rig according to claim 1, which is characterized in that
The freezing pipe is provided with three circles, respectively inner ring, centre circle and outer ring, the inner ring, institute altogether in the accommodation space
It states centre circle and the outer ring is respectively arranged with several freezing pipes and is equally spaced；
Preferably, the inner ring is at a distance from the borehole wall, the distance between the inner ring and the centre circle, the centre circle and institute
Stating the distance between outer ring is 15cm；
Preferably, the freezing pipe is provided with 18 in the inner ring；
Preferably, the freezing pipe is provided with 30 in the centre circle；
Preferably, the freezing pipe is provided with 42 in the outer ring.
6. experimental rig according to claim 5, which is characterized in that
It is provided on the middle part in the short transverse of each fill stratum and the center line positioned at each earthen fill zone more
A measuring point；
Preferably, on the center line of each earthen fill zone setting there are five the measuring point, the borehole wall and the inner ring it
Between, between the inner ring and the centre circle measuring point is respectively arranged between the centre circle and the outer ring, it is described
There are two the measuring points, five measuring points to be equally spaced, be all provided on each measuring point for setting between outer ring and the cylinder
It is equipped with the measurement external member；
Preferably, the temperature test element is thermocouple string；
Preferably, the moisture measurement element is moisture transducer.
7. experimental rig according to claim 1, which is characterized in that
The monitoring system further includes temperature data acquisition instrument, moisture data Acquisition Instrument, stress data acquisition instrument, the temperature number
According to Acquisition Instrument and the temperature test element, the moisture data Acquisition Instrument and the moisture measurement element, the stress data
Acquisition Instrument passes through survey line with the stress test element and connects；
The temperature data acquisition instrument can acquire temperature data, the moisture of the soil body by the temperature test element
Data collecting instrument can acquire the moisture data of the soil body, the stress data acquisition instrument energy by the moisture measurement element
The stress data of the soil body is enough acquired by the stress test element；
The temperature data acquisition instrument, the stress data acquisition instrument and the moisture data Acquisition Instrument pass through data line and electricity
Brain connection, the computer are able to record and handle the temperature data acquisition instrument, the stress data acquisition instrument and the moisture
Data collecting instrument data collected.
8. experimental rig according to claim 1, which is characterized in that
The monitoring system further includes having displacement acquisition element and displacement data Acquisition Instrument, the displacement data Acquisition Instrument and described
Displacement acquisition element is connected by survey line, is surveyed on the extended line for zone centerline of banketing described in each and in the borehole wall
Surface on be provided with the displacement acquisition element, the displacement data Acquisition Instrument can pass through the displacement acquisition member
Part acquires the displacement data of the borehole wall；
The displacement data Acquisition Instrument is connect by data line with computer, and the computer is able to record and handles the displacement data
Acquisition Instrument data collected.
9. experimental rig according to claim 1, which is characterized in that
The freezing system further includes feed liquor current divider and liquid current divider out, the feed liquor current divider setting the inlet tube with
Between the freezing pipe, the feed liquor current divider can make the homogeneous media flow into each freezing pipe, the liquid point out
It flows device to be arranged between the outlet tube and the freezing pipe, the liquid current divider out can be assembled described in the cryovial
Medium is simultaneously output to outlet tube；
The freezing pipe is made of inner tube with the outer tube for being sheathed on said inner tube periphery, and said inner tube and the outer tube are in the jelly
The bottom connection of pipe is tied, the top of said inner tube is connected to by the feed liquor current divider with the inlet tube, the top of the outer tube
End is connected to by the liquid current divider out with the outlet tube；
The medium is CaCl2Solution and/or alcohol.
10. carrying out various soils Artificial Frozen Soil using the experimental rig of any one of any one of claims 1 to 99 and borehole wall collective effect being tried
The method tested, which comprises the steps of:
(1) determine displacement the likelihood ratio, the time likelihood ratio, the temperature likelihood ratio, the thermal coefficient likelihood ratio, the coefficient of heat conduction likelihood ratio,
The heat flow likelihood ratio, the refrigerant agent flow velocity likelihood ratio, the design of coagulation body wall strength；
(2) all freezing pipes are predefined into good position and is fixed, prevent freezing pipe position during banketing from occurring partially
It moves；
(3) cylinder is hung on testing stand by purlin vehicle, the borehole wall is placed in cylinder and sets cylinder and the borehole wall in concentric circles
It sets, sealing is set in bottom of cylinder, the freezing pipe of three coil structures fixed in the step (2) is placed in cylinder and the borehole wall
Between, it bankets, constantly vibrates during banketing to guarantee that soil layer is closely knit according to the design form of fill stratum and earthen fill zone,
The geomembrane of waterproof is respectively provided between adjacent fill stratum and between adjacent earthen fill zone to eliminate each fill stratum and banket
Water translocation between area, while five measuring points are set on the center line of each earthen fill zone, it is arranged on measuring point and is surveyed by temperature
The measurement external member for trying element, moisture measurement element and stress test element composition, respectively by temperature test element and temperature data
Acquisition Instrument, moisture measurement element and moisture data Acquisition Instrument, stress test element and stress data acquisition instrument pass through data lines
It is attached, a displacement acquisition element is respectively provided on the inner wall of the borehole wall and on the center line of each earthen fill zone, by position
It moves acquisition elements to connect with displacement data Acquisition Instrument by data lines, by temperature data acquisition instrument, moisture data Acquisition Instrument, answer
Force data Acquisition Instrument and displacement data Acquisition Instrument are connect by data line with computer, and after the completion of banketing, cover board is placed in cylinder
On；
(4) loading system is arranged outside cylinder, in the surface plastic covering foam of cylinder；
(5) monitoring system is debugged, confirmation temperature test element, moisture measurement element and stress test element work normally
Afterwards, start-up loading system is gradually forced into stress design calculated value, and stablizes preset time；
(6) simulation is freezed, and adjusting control freezing system makes Frozen wall thickness reach design value, in entire freezing process, passes through
Temperature to the soil body of temperature data acquisition instrument, moisture data Acquisition Instrument, stress data acquisition instrument and displacement data Acquisition Instrument, water
Divide, the data that stress and the borehole wall are displaced carry out data acquisition, acquisition time are as follows: it is primary every 10min acquisition at the initial stage of freezing,
It is primary every 30min acquisition freezing the later period；
(7) when formed stablize frost wall, temperature and moisture content do not change in earthen fill zone after data acquisition, to freezing
Wall thaws, and removes experimental rig.
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| CN112761729A (en) * | 2021-01-11 | 2021-05-07 | 中国矿业大学 | Freezing method construction-based mine shaft temperature-displacement field coupling physical simulation experiment device and method |
| CN112761729B (en) * | 2021-01-11 | 2022-03-25 | 中国矿业大学 | Freezing method construction-based mine shaft temperature-displacement field coupling physical simulation experiment device and method |
| BE1028237B1 (en) * | 2021-06-07 | 2021-11-24 | Univ Wuhan Tech | Manhole freeze model test fixture for high floor voltages and high water head |
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Application publication date: 20190118 |