CN108489435A - The method of the steel string type sensor system and deformations early warning that be monitored to the borehole wall - Google Patents
The method of the steel string type sensor system and deformations early warning that be monitored to the borehole wall Download PDFInfo
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- CN108489435A CN108489435A CN201810242255.7A CN201810242255A CN108489435A CN 108489435 A CN108489435 A CN 108489435A CN 201810242255 A CN201810242255 A CN 201810242255A CN 108489435 A CN108489435 A CN 108489435A
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- borehole wall
- strain
- vibrating
- chord type
- type pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
Abstract
The present invention provides a kind of method of the steel string type sensor system being monitored to the borehole wall and deformation early warning, and the steel string type sensor system includes：Vibrating-wire concrete strain gauge, steel chord type pressure gauge, cable, measuring instrument and computer；Several vibrating-wire concrete strain gauges are arranged on the inner surface of the borehole wall, several steel chord type pressure gauges are arranged at the inside of the borehole wall；Several described vibrating-wire concrete strain gauges and several described steel chord type pressure gauges are connect by the cable with the measuring instrument, and the measuring instrument is connect with the computer；The measuring instrument receives the frequency signal acquired by the vibrating-wire concrete strain gauge and the steel chord type pressure gauge, and the frequency signal is converted to digital signal by the measuring instrument, and the digital signal is passed to the computer.The present invention can be monitored grouting pressure, borehole wall deformation and the borehole wall temperature that the borehole wall is born, it is ensured that observation system long-term stability and reliability.
Description
Technical field
The present invention relates to mine construction fields, and in particular to a kind of steel string type sensor system that the borehole wall is monitored and
The method for deforming early warning.
Background technology
Since the 1980s, in great Tun, Xuzhou, the Huaibei, Yanzhou, the mining areas such as summer have a large amount of mines thickness have occurred forever
Shaft rupture in topsoil, their some are happened in shaft construction, and after some is happened at mine operation, less serious case stops
Production, the saturating watered-out well of severe one, the serious further development for constraining China's depth vertical construction.Research to shaft wall fracture mechanism,
Form vertical additional force hypothesis, mining influence hypothesis, neotectonic movement hypothesis etc..A large amount of theory analysis, numerical simulation and existing
The achievement of field measurement research supports vertical additional force hypothesis：Special formation water-bearing layer is because of exploitation and after freezing pipe pulls out
Thaw collapse and cause the overlying soil body sink.The soil body interacts in infall process with the borehole wall, and it is attached to be applied to borehole wall outer surface one
Reinforcing system.When the additional force system rises to certain value, concrete walling goes to pot because that cannot bear.Shaft wall fracture is thick surface soil
Layer is with shaft wall structure interaction as a result, therefore shaft wall fracture administering method mainly has borehole wall reinforcing and two class of stratum consolidation.
Have a large amount of research to the method for handling the borehole wall, includes mainly：Channel steel walling crib pneumatically placed concrete method for strengthening, jacketed borehole wall method are opened
Slot destressing method.The method handled stratum mainly has：Grouting behind shaft or drift lining and surface grout injection are reinforced.It is envelope to the purpose of stratum slip casting
The water conservancy channel of stifled pit shaft periphery aquifer water-bearing stratum, retardance aquifer water-bearing stratum is hydrophobic, can slow down, reduce the heavy of pit shaft surrounding formations
Drop reduces the vertical spectra suffered by shaft wall.
Although having a large amount of research and engineering practice about the consolidation grouting on shaft wall in surface soil stratum at present, with coal
Charcoal resource exploitation intensity continues to increase, and superficial part resource is increasingly reduced, and Some Domestic mine mutually goes on people deep coal mining
State, more and more shaft of vertical well need to pass through deep alluvium.In particular, as the alluvium that pit shaft passes through is thicker,
The degree of consolidation of soil layer is bigger after its wall, can note performance worse and worse.Obviously, it carries out deep vertical stratum and carries out consolidation grouting, it must
Palpus raising grouting pressure appropriate still increases grouting pressure if passing through merely, is easy to generate fracture grouting, excessive note
Slurry pressure can directly act on pit shaft, and cause the destruction of pit shaft.For monitoring pit shaft grouting treatment during the borehole wall stress,
Analyze the pressure diffusion range of grouting serous fluid, it is ensured that safety in production of the mine during comprehensive treatment, it is necessary to entire slip casting
Cheng Jinhang is monitored in real time, and entirely monitor system fully play its forewarning function must be first against the current force-bearing situation of the borehole wall
Determine the early warning value of borehole wall deformation.Therefore, carry out borehole wall monitoring during deep vertical stratum consolidation slip casting under existing wellbore conditions
System determines that the research of method is extremely urgent with deformation early warning value.
Invention content
The purpose of the present invention is to provide a kind of steel string type sensor system being monitored to the borehole wall and deform early warning
Method is monitored the borehole wall during carrying out stratum consolidation slip casting for the deep vertical under existing wellbore conditions, the present invention
Technical solution solve under existing wellbore conditions the monitoring problem of the borehole wall during deep vertical stratum consolidation slip casting, and provide
By the borehole wall current force-bearing situation, the determination method of the borehole wall of determination deformation early warning value, can fill up and there is no at present in existing well
Deep vertical stratum consolidation Grouting Monitoring System and deformation early warning value determine the blank of method under the conditions of cylinder, are pit shaft rupture Synthetics
The important component of reason scheme, it is ensured that safety in production of the mine during comprehensive treatment, with greatly improving deep vertical
The safety of layer consolidation grouting, and construction risk is substantially reduced, social and economic benefits are notable.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of steel string type sensor system being monitored to the borehole wall carries out ground for the deep vertical under existing wellbore conditions
The borehole wall is monitored during layer consolidation grouting, and then early warning is carried out to deformation, which is characterized in that the steel chord type
Sensing system includes：Vibrating-wire concrete strain gauge, steel chord type pressure gauge, cable, measuring instrument and computer；
Several described vibrating-wire concrete strain gauges are arranged on the inner surface of the borehole wall, several described string wires
Formula pressure gauge is arranged at the inside of the borehole wall；
Several described vibrating-wire concrete strain gauges and several described steel chord type pressure gauges by the cable with
The measuring instrument connection, the measuring instrument are connect with the computer；
The measuring instrument, which receives the frequency acquired by the vibrating-wire concrete strain gauge and the steel chord type pressure gauge, to be believed
Number, the frequency signal is converted to the digital signal of strain value and pressure value including the borehole wall by the measuring instrument, and will
The digital signal passes to the computer.
Further, in above-mentioned steel string type sensor system, the vibrating-wire concrete strain gauge is in the borehole wall
Be configured in two ways on inner surface, a kind of mode be along the borehole wall inner surface is vertically arranged, another way is
Inner surface along the borehole wall is arranged circumferentially；
The steel chord type pressure gauge is configured in two ways in the inside of the borehole wall, and a kind of mode is along the well
The inside of wall is vertically arranged, another way is arranged circumferentially along the inside of the borehole wall.
Further, it in above-mentioned steel string type sensor system, is additionally provided with along the vertical direction of the borehole wall multiple
Horizontal monitor layer；
Each monitor layer includes a cable；
Include four to eight vertically arranged vibrating-wire concrete strain gauges and four in each monitor layer
The vibrating-wire concrete strain gauge being arranged circumferentially to eight, the vertically arranged steel chord type in a monitor layer
Concrete strain gauge is identical as the quantity of vibrating-wire concrete strain gauge being arranged circumferentially；
The vertically arranged vibrating-wire concrete strain gauge in a monitor layer is evenly distributed on the well
On the inner surface of wall, the vibrating-wire concrete strain gauge that is arranged circumferentially is evenly distributed on the inner surface of the borehole wall；
Further include having four to eight vertically arranged steel chord type pressure gauges and four to eight in each monitor layer
A steel chord type pressure gauge being arranged circumferentially, vertically arranged the steel chord type pressure gauge and ring in a monitor layer
Quantity to the steel chord type pressure gauge of setting is identical；
The vertically arranged steel chord type pressure gauge in a monitor layer is evenly distributed in the borehole wall
Portion, the steel chord type pressure gauge being arranged circumferentially are evenly distributed on the inside of the borehole wall.
Further, in above-mentioned steel string type sensor system, the vibrating-wire concrete strain gauge passes through pedestal and swollen
Swollen bolt is fixed on the inner surface of the borehole wall；
The steel chord type pressure gauge is arranged in the notch opened up on the borehole wall, and the steel chord type pressure gauge is placed in described
The bottom of notch, the rest in the notch are filled by cement.
Further, in above-mentioned steel string type sensor system, in the vibrating-wire concrete strain gauge and/or the steel
It is provided with thermistor in string formula pressure gauge, the temperature value of the borehole wall is measured by the thermistor, the temperature value passes through
The measuring instrument passes to the computer.
Further, in above-mentioned steel string type sensor system, the borehole wall includes outer shaft wall and inner layer well wall, described
Outer shaft wall is set in the periphery of the inner layer well wall；The monitor layer is arranged on the inner layer well wall and along the internal layer well
It is provided on the vertical direction of wall multiple.
On the other hand, borehole wall monitoring and deformation being carried out using above-mentioned steel string type sensor system the present invention also provides a kind of
The method that early warning value determines, includes the following steps：
Before slip casting, the stratum passed through to the borehole wall is analyzed, and determines the position of monitor layer respectively；
Several measuring points are buried in each monitor layer, and the vibrating-wire concrete is installed respectively on the measuring point and is answered
Become meter and the steel chord type pressure gauge, the vibrating-wire concrete strain gauge and the steel chord type pressure gauge and its conducting wire are passed through
Waterproof junction box and the cable connection, the cable are connect with the measuring instrument, by the measuring instrument and the computer
Connection；
In the bottom water-bearing layers Hou Sha of the borehole wall peripheral stratum, several steel chord type pressure gauges, the steel chord type are set
Pressure gauge and its conducting wire by waterproof junction box and the cable connection, carry out initial measurement in installation process and obtain pressure,
The primary data of stress and strain, initial measurement is no less than secondary, and the vibrating-wire concrete strain gauge deforms the borehole wall
It is monitored, monitors 1~2 time in each hour during slip casting, monitors daily 1~2 time after slip casting, the steel chord type pressure gauge
The pressure being subject to the borehole wall is monitored, monitor 1~2 time in each hour during slip casting, monitor 1 after slip casting daily~
2 times, it is provided with thermistor in the vibrating-wire concrete strain gauge and/or the steel chord type pressure gauge and is supervised as temperature
Device is surveyed, the temperature monitoring device carries out temperature monitoring to the borehole wall, monitored daily during slip casting 1~2 time, after slip casting
It monitors 1~2 time weekly, the computer receives and processes the vibrating-wire concrete strain gauge and the steel chord type pressure gauge is adopted
The data of collection.
Further, borehole wall monitoring is carried out using steel string type sensor system and deform the method that early warning value determines above-mentioned
In, further include following steps：
The data that the vibrating-wire concrete strain gauge and the steel chord type pressure gauge acquire are formulated into data record sheet, are painted
Pressing pressure, stress, the strain relation curve that changes with time are carrying out so that the stress to the borehole wall judges
In data handling procedure, abnormal data is rejected according to the treatment principle of measurement error, and carries out repetition measurement correction in time；
According to monitoring result, when cataclysm occurs for data variation rate, increase monitoring number.
Further, borehole wall monitoring is carried out using steel string type sensor system and deform the method that early warning value determines above-mentioned
In, the borehole wall deformation monitoring, using three-level compressive strain early warning and three-level stretching strain early warning, three-level compressive strain early warning is respectively to press
It is respectively that stretching strain yellow is pre- to strain yellow early warning, compressive strain orange warning and compressive strain red early warning, three-level stretching strain early warning
Alert, stretching strain orange warning and stretching strain red early warning；
The determination of the borehole wall deformation monitoring three-level stretching strain early warning value and three-level compressive strain early warning value, including walk as follows
Suddenly：
The borehole wall external load is calculated by 1.0 times of hydraulic pressure：P=0.01 × h, h are the buried depth of level monitoring, unit is rice；
The ring of borehole wall inner edge is calculated by the plane strain mechanical model of uniformly distributed external load by Elasticity thick cyclinder outer wall
It is to stress：Wherein, it is rice that R, which is outer radius, the unit of the borehole wall, r be the borehole wall inside radius,
Unit is rice；
It is from the vertical stress of the re-computation monitoring by overlying pit shaft：σz=γ h, γ are the borehole wall unit weight；
The borehole wall inner edge approximation hoop strain is calculated according to the stress-strain relation of elastic plane strain model
For：μ is the borehole wall Poisson's ratio；
Concrete crushing strength design value is fc, unit MPa, elasticity modulus Ec, unit MPa, calculate concrete
Allow compressive strain be：
When considering partial safety factor for load 1.35, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.35εt
Shi Qidong compressive strain yellow early warning, Δ ε=[ε]c-1.35εt≤ compressive strain value ＜ Δs ε=[ε]c-1.2εtIt is pre- for compressive strain yellow
Alert range；
When considering partial safety factor for load 1.2, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.2εtWhen
Start compressive strain orange warning, Δ ε=[ε]c-1.2εt≤ compressive strain value ＜ Δs ε=[ε]c-εtFor compressive strain orange warning model
It encloses；
When not considering partial safety factor for load, the borehole wall approximate compressive strain value more than needed reaches or surpasses Δ ε=[ε]c-εt
Shi Qidong compressive strain red early warnings；
Concrete tensile strength design value is ftMPa, elasticity modulus EcMPa, calculating concrete permission stretching strain is：
When it is 1/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches
Δ ε=- 1/3 εtShi Qidong stretching strain yellow early warning, Δ ε=- 1/3 εt≤ stretching strain value ＜ Δ ε=- 2/3 εtFor stretching strain yellow
Early warning range；
When it is 2/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches
Δ ε=- 2/3 εtShi Qidong stretching strain orange warnings, Δ ε=- 2/3 εt≤ stretching strain value ＜ Δs ε=- (2/3 εt+[ε]t) it is to draw
Strain orange warning range；
When the consideration initial compressive strain reduction coefficient of the borehole wall is 2/3 and reaches concrete permission stretching strain, the borehole wall is rich
Remaining approximation stretching strain value reaches or surpasses Δ ε=- (2/3 εt+[ε]t) when start stretching strain red early warning.
Compared with the immediate prior art, technical solution provided by the invention has following excellent effect：
The method of a kind of steel string type sensor system being monitored to the borehole wall provided by the invention and deformation early warning, is used for
Deep vertical under existing wellbore conditions be monitored to the borehole wall during stratum consolidation slip casting, by using string wire simultaneously
Grouting pressure, borehole wall deformation and the borehole wall temperature that formula concrete strain gauge and steel chord type pressure gauge bear the borehole wall are monitored,
Ensure observation system long-term stability and reliability.
The monitoring that grouting pressure is born by the borehole wall to primary layer position, to understand and grasp slip casting suffered by the borehole wall in time
The size and the regularity of distribution of pressure, the grouting pressure setting during instructing pit shaft to administer, and to jeopardize the borehole wall of sidewall safety by
Power is warned；By the monitoring deformed to the primary layer position borehole wall, the stress condition of the borehole wall is understood, judge that the borehole wall uses reliable
Property and safe coefficient, and the guidance of real-time information-aided construction can be provided for the control of grouting pressure during pit shaft comprehensive treatment；
By the monitoring to primary layer position borehole wall temperature, understands the variation of borehole wall temperature, can judge slurry reaction temperature to the borehole wall in time
The influence of temperature change solves the monitoring problem of the borehole wall during deep vertical stratum consolidation slip casting under existing wellbore conditions, and
And give by the current force-bearing situation of the borehole wall and the determination method of the borehole wall of determination deformation early warning value, it can fill up and there is no at present
Deep vertical stratum consolidation Grouting Monitoring System and deformation early warning value determine the blank of method under existing wellbore conditions, are pit shaft ruptures
The important component of comprehensive treatment scheme, it is ensured that safety in production of the mine during comprehensive treatment greatly improves depth
The safety of vertical stratum consolidation slip casting, and construction risk is substantially reduced, social and economic benefits are notable.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.Wherein：
Fig. 1 is the testing element arrangement schematic diagram of the embodiment of the present invention；
Fig. 2 is the circumferential diagrammatic cross-section of testing element arrangement of the embodiment of the present invention；
Fig. 3 is the steel chord type pressure gauge and notch schematic diagram of the flush type of the embodiment of the present invention；
Fig. 4 is steel chord type pressure gauge vertical cross section schematic diagram vertically arranged in Fig. 3；
Fig. 5 is the steel chord type pressure gauge vertical cross section schematic diagram being arranged circumferentially in Fig. 3；
Fig. 6 is that the vibrating-wire concrete strain gauge of the embodiment of the present invention buries schematic diagram；
Fig. 7 is vibrating-wire concrete strain gauge scheme of installation in Fig. 6；
Fig. 8 is vibrating-wire concrete strain gauge vertical cross section schematic diagram vertically arranged in Fig. 6；
Reference sign：1 outer shaft wall, 2 inner layer well walls, 3 vibrating-wire concrete strain gauges, 4 vibrating-wire concretes are answered
Become meter, 5 steel chord type pressure gauges, 6 steel chord type pressure gauges, 7 cables, 8 measuring instruments, 9 computers, 10 bolts, 11 pedestals.
Specific implementation mode
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 of god, it can modify in the present invention and modification.For example, being illustrated or described as the spy of the 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 profit 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 must be with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.The term " connected " that is used in the present invention, " 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；Can have
Line electrical connection, radio connection can also be 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 Figures 1 to 8, according to an embodiment of the invention, a kind of steel chord type biography being monitored to the borehole wall is provided
Sensor system is monitored the borehole wall during carrying out stratum consolidation slip casting for the deep vertical under existing wellbore conditions, into
And early warning is carried out to deformation, steel string type sensor system includes：Vibrating-wire concrete strain gauge (3 and 4), steel chord type pressure gauge (5
With 6), cable 7, measuring instrument 8 and computer 9；
Wherein, vibrating-wire concrete strain gauge (3 and 4), steel chord type pressure gauge (5 and 6), cable 7 can be collectively referred to as test member
Part.
Vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6) take steel chord type sensing element conduct
Primary instrument, steel chord type frequency recorder is as secondary meter；Steel chord type pressure gauge (5 and 6) bears grouting pressure for monitoring the borehole wall,
Obtain the data of borehole wall internal pressure；Vibrating-wire concrete strain gauge (3 and 4) is used to monitor the vertical and hoop strain of the borehole wall,
The vibrating-wire concrete strain gauge 4 being arranged circumferentially is used to monitor the hoop strain of the borehole wall, and vertically arranged vibrating-wire concrete is answered
Become vertical strain of the meter 3 for monitoring the borehole wall.The data of strain in shaft lining, are answered by plastoelasticity during acquisition stratum slip casting
The data of borehole wall stress during the slip casting of stratum can be calculated in the relationship of power-strain.
The borehole wall includes outer shaft wall 1 and inner layer well wall 2, and outer shaft wall 1 is set in the periphery of inner layer well wall 2.
As shown in Figure 1, several vibrating-wire concrete strain gauges (3 and 4) are arranged on the inner surface of inner layer well wall 2,
Several steel chord type pressure gauges (5 and 6) are arranged at the inside of inner layer well wall 2；Several vibrating-wire concrete strain gauge (3 Hes
4) it is connect with measuring instrument 8 by cable 7 with several steel chord type pressure gauges (5 and 6), measuring instrument 8 is connect with computer 9；It surveys
It measures instrument 8 and receives the frequency signal acquired by vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6), measuring instrument 8
Frequency signal is converted to the digital signal of strain value and pressure value including the borehole wall, and digital signal is passed into computer 9.
Computer 9 receives and processes the data of vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6) acquisition.It is preferred that
Transmission wiredly and/or wirelessly may be used in ground, vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6)
The data of acquisition are transferred to measuring instrument 8 by mode.Wherein cable 7 used in wire transmission mode is mining sheathed shielded cable, such as
This setting can resist electromagnetic interference.
Further, the monitor layer of multiple levels is provided with along the vertical direction of the borehole wall；Monitor layer is mainly disposed to note
The position of pulp layer ± 10 meter, and grouting layer is mainly disposed to the layer of sand position of unconsolidated formation, because the thickness of layer of sand is different, thus it is specific
Monitoring layer number should determine that the position between grouting layer ± 10 meter is at interval of 10~15 meters according to actual formation soil nature and thickness
(such as：10 meters, 11 meters, 12 meters, 13 meters, 14 meters, 15 meters) 1 monitor layer of setting, preferably 10 meters, superficial part interval are taken at deep interval
Take 15 meters.The top of the borehole wall is to the other positions between the bottom end of the borehole wall in addition to the position of grouting layer ± 10 meter, at interval of 30~50
Rice is (such as：30 meters, 35 meters, 40 meters, 45 meters, 50 meters) setting 1 monitor layer, preferably deep take 30 meters, superficial part take 50 meters；Weathering
Basement rock is spaced 30 meters and 40 meters respectively one monitor layer of setting, i.e., 30 meters of settings one below interface individually below the bottom of with containing interface
A monitor layer, 70 meters of settings, one monitor layer.
As shown in fig. 6, vibrating-wire concrete strain gauge (3 and 4) carries out in two ways on the inner surface of inner layer well wall 2
Setting, a kind of mode be along inner layer well wall 2 inner surface is vertically arranged, another way is inner surface ring along inner layer well wall 2
To setting；
As shown in figure 3, steel chord type pressure gauge (5 and 6) is configured in two ways in the inside of inner layer well wall 2, it is a kind of
Mode is that vertically arranged, another way is arranged circumferentially along the inside of inner layer well wall 2 along the inside of inner layer well wall 2.
Further, each monitor layer include vibrating-wire concrete strain gauge (3 and 4) that is multiple vertical and being arranged circumferentially,
The multiple vertical and steel chord type pressure gauge (5 and 6) being arranged circumferentially and a cable 7；
Specifically, vibrating-wire concrete strain gauge (3 and 4), steel chord type pressure gauge (5 and 6) and cable 7 embedding manner
For：
As shown in fig. 7, the embedded of vibrating-wire concrete strain gauge (3 and 4) uses non-embedded type, in inner layer well wall 2
It is punched on surface, vibrating-wire concrete strain gauge (3 and 4) is fixed on by pedestal 11 and expansion bolt 10 in inner layer well wall 2
On surface.Include four to eight vertically arranged vibrating-wire concrete strain gauges 3 in each monitor layer, preferably vertically sets
Six vibrating-wire concrete strain gauges 3 are set, include four to eight vibrating-wire concretes being arranged circumferentially in each monitor layer
Strain gauge 4, is preferably arranged circumferentially six vibrating-wire concrete strain gauges 4, and such setting can be appointed effectively completing monitoring
Monitoring cost is reduced in the case of business；In a monitor layer vertically arranged vibrating-wire concrete strain gauge 3 be arranged circumferentially
Vibrating-wire concrete strain gauge 4 identical, all vibrating-wire concrete strain gauge (3 and 4) of quantity central point it is contour, vertical
The vibrating-wire concrete that the vibrating-wire concrete strain gauge 3 of setting is evenly distributed on the inner surface of inner layer well wall 2, is arranged circumferentially
Strain gauge 4 is evenly distributed on the inner surface of inner layer well wall 2, each vertically arranged vibrating-wire concrete strain gauge 3 and one
The adjacent vibrating-wire concrete strain gauge 4 being arranged circumferentially at T-shaped type or L-type and is arranged in a mutually vertical manner, preferably vertically arranged
Vibrating-wire concrete strain gauge 3 and the vibrating-wire concrete strain gauge 4 that is arranged circumferentially form the T-shaped type of a traverse.
As shown in figure 3, steel chord type pressure gauge (5 and 6) is embedded to use flush type, 200mm (circumferential direction) is excavated in inner layer well wall 2
The notch of × 80mm (vertical) × 80mm (radial direction), for installing a circumferential steel chord type pressure gauge 6；It is opened in inner layer well wall 2
The notch for digging 200mm (vertical) × 80mm (circumferential direction) × 80mm (radial direction), for installing a vertical steel chord type pressure gauge 5；
Steel chord type pressure gauge (5 and 6) is arranged in notch, is placed in the bottom of notch, installation is complete in steel chord type pressure gauge (5 and 6)
Afterwards, by notch dabbing, then the rest in notch is backfilled with high-grade cement mortar.Include in each monitor layer
Four to eight vertically arranged steel chord type pressure gauges 5, preferably vertically arranged six steel chord type pressure gauges 5, each monitor layer is also
The steel chord type pressure gauge 6 being arranged circumferentially including four to eight is preferably arranged circumferentially six steel chord type pressure gauges 6, is arranged such
Monitoring cost can be reduced in the case where effectively completing monitoring task；The vertically arranged steel chord type pressure in a monitor layer
The central point of the steel chord type pressure gauge (5 and 6) identical as the quantity for the steel chord type pressure gauge 6 being arranged circumferentially, all of power meter 5 is contour,
The steel chord type pressure gauge 6 that vertically arranged steel chord type pressure gauge 5 is evenly distributed on the inside of inner layer well wall 2, is arranged circumferentially is uniform
It is distributed in the inside of inner layer well wall 2, each vertically arranged steel chord type pressure gauge 5 and a steel chord type pressure gauge being arranged circumferentially
6 at T-type or L-type and are arranged in a mutually vertical manner, preferably vertically arranged steel chord type pressure gauge 5 and the steel chord type pressure gauge being arranged circumferentially
6 form the T-type of a traverse.
A cable 7, vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6) is arranged in each monitor layer
And its conducting wire is connect by waterproof junction box with cable 7, cable 7 is fixed using wire rope suspensioning, and cable 7 draws with monitoring element
The connector of outlet strictly seals, it is ensured that monitoring element works normally；
Further, it is provided with heat in vibrating-wire concrete strain gauge (3 and 4) and/or steel chord type pressure gauge (5 and 6)
Quick resistance, the temperature value of the borehole wall is measured by thermistor, and temperature value passes to computer 9 by measuring instrument 8.
Monitor layer is set containing primary layers positions such as interfaces the bottom of with by position to grouting layer ± 10 meter and weathered rocks, and
It, can be to slip casting that the borehole wall is born in monitor layer setting vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6)
Pressure, borehole wall deformation and borehole wall temperature are monitored, to understand and grasp the size of grouting pressure suffered by the borehole wall in time and to divide
Cloth rule, the grouting pressure setting during instructing pit shaft to administer, and the borehole wall stress for jeopardizing sidewall safety is warned.Pass through
Monitoring to primary layer position borehole wall temperature understands the variation of borehole wall temperature, can judge slurry reaction temperature to borehole wall temperature in time
The influence of variation.
Further, using as any one of claim 1 to 6 system carries out borehole wall monitoring and deforms early warning value determination
Method, which is characterized in that include the following steps：
Testing element (including the vibrating-wire concrete strain gauge 3, vertically arranged being arranged circumferentially is determined according to monitoring content
Vibrating-wire concrete strain gauge 4, the steel chord type pressure gauge 5 being arranged circumferentially, vertically arranged steel chord type pressure gauge 6 and cable 7
Specification and quantity, and after being bought, it is carried out to the preparations such as calibration, connector processing one by one in laboratory.
Before slip casting, the stratum that the borehole wall passes through is analyzed, and determines the position of monitor layer respectively, monitor layer is mainly set
It sets in the position of grouting layer ± 10 meter, and grouting layer is mainly disposed to the layer of sand position of unconsolidated formation, because the thickness of layer of sand is different,
Therefore specifically monitoring layer number should be determined according to actual formation soil nature and thickness, the position between grouting layer ± 10 meter at interval of 10~
15 meters (such as：10 meters, 11 meters, 12 meters, 13 meters, 14 meters, 15 meters) 1 monitor layer of setting, preferably 10 meters, superficial part are taken at deep interval
Interval takes 15 meters.The top of the borehole wall is to the other positions between the bottom end of the borehole wall in addition to the position of grouting layer ± 10 meter, at interval of 30
~50 meters (such as：30 meters, 35 meters, 40 meters, 45 meters, 50 meters) setting 1 monitor layer, preferably deep take 30 meters, superficial part take 50 meters；
Weathered rocks are spaced 30 meters and 40 meters respectively one monitor layer of setting individually below the bottom of with containing interface, i.e., are set for 30 meters below interface
Set a monitor layer, 70 meters of settings, one monitor layer.According to slip casting actual conditions, the soil quality of stratum and water content, part is adjusted again
It is whole.
Several measuring points are buried in each monitor layer, and vibrating-wire concrete strain gauge (3 and 4) is installed on measuring point, is being surveyed
Notch is excavated on point, and steel chord type pressure gauge (5 and 6) is installed in notch, by vibrating-wire concrete strain gauge (3 and 4) and steel
String formula pressure gauge (5 and 6) and its conducting wire are connect by waterproof junction box with cable 7, and cable 7 is connect with measuring instrument 8, will be measured
Instrument 8 is connect with computer 9, is arranged several steel chord type pressure gauges in the bottom water-bearing layers Hou Sha of well, steel chord type pressure gauge and its is led
Line is connect by waterproof junction box with cable 7, to vibrating-wire concrete strain gauge (3 and 4), steel chord type pressure gauge in installation process
(5 and 6), cable 7 carry out continuity check, record installation process, after the completion of steel chord type pressure gauge (5 and 6) is installed and is tested,
By notch dabbing, then the rest in notch is backfilled with high-grade cement mortar, initial measurement is carried out in installation process
And pressure, the primary data of stress and strain are obtained, initial measurement is no less than secondary, and vibrating-wire concrete strain gauge (3 and 4) is right
Borehole wall deformation is monitored, and is monitored 1~2 time in each hour during slip casting, is monitored daily 1~2 time after slip casting, according to monitoring
As a result, when cataclysm occurs for data variation rate, increase monitoring number, the pressure that steel chord type pressure gauge (5 and 6) is subject to the borehole wall
It is monitored, monitors 1~2 time in each hour during slip casting, monitors daily 1~2 time after slip casting, according to monitoring result, when
When cataclysm occurs for data variation rate, increase monitoring number, in vibrating-wire concrete strain gauge (3 and 4) and/or steel chord type pressure
Thermistor is provided in power meter (5 and 6) as temperature monitoring device, temperature monitoring device carries out temperature monitoring to the borehole wall,
It monitors 1~2 time, is monitored weekly after slip casting 1~2 time daily during slip casting, according to monitoring result, when data variation rate occurs suddenly
When change, increase monitoring number, computer 9 receives and processes vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 Hes
6) data acquired.
Further, the data that vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6) acquire are formulated
Data record sheet, draws pressure, stress, strain change with time relation curve, makes and sentencing so as to the stress to the borehole wall
It is disconnected, in carrying out data handling procedure, abnormal data is rejected according to the treatment principle of measurement error, and is answered in time
Survey correction.
Further, borehole wall deformation monitoring, using three-level compressive strain early warning and three-level stretching strain early warning, three-level compressive strain is pre-
Alert is respectively the early warning of compressive strain yellow, compressive strain orange warning and compressive strain red early warning, and three-level stretching strain early warning is respectively to draw
Strain yellow early warning, stretching strain orange warning and stretching strain red early warning；
The determination of borehole wall deformation monitoring three-level stretching strain early warning value and three-level compressive strain early warning value, includes the following steps：
Borehole wall external load is calculated by 1.0 times of hydraulic pressure：P=0.01 × h, h are the buried depth of level monitoring, unit is rice；
The ring of borehole wall inner edge is calculated by the plane strain mechanical model of uniformly distributed external load by Elasticity thick cyclinder outer wall
It is to stress：Wherein, it is rice that R, which is outer radius, the unit of the borehole wall, and r is the inside radius of inner layer well wall 2, unit
It is rice；
It is from the vertical stress of the re-computation monitoring by overlying pit shaft：σz=γ h, γ are concrete walling unit weight；
Calculating the approximation hoop strain of borehole wall inner edge according to the stress-strain relation of elastic plane strain model is：μ is concrete walling Poisson's ratio；
Concrete crushing strength design value is fc, unit MPa, elasticity modulus Ec, unit MPa, calculate concrete
Allow compressive strain be：
When considering partial safety factor for load 1.35, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.35εtShi Qi
Dynamic pressure strains yellow early warning, Δ ε=[ε]c-1.35εt≤ compressive strain value ＜ Δs ε=[ε]c-1.2εtFor compressive strain yellow early warning model
It encloses；
When considering partial safety factor for load 1.2, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.2εtShi Qidong
Compressive strain orange warning, Δ ε=[ε]c-1.2εt≤ compressive strain value ＜ Δs ε=[ε]c-εtFor compressive strain orange warning range；
When not considering partial safety factor for load, the borehole wall approximate compressive strain value more than needed reaches or surpasses Δ ε=[ε]c-εtShi Qi
Dynamic pressure strains red early warning；
Concrete tensile strength design value is ftMPa, elasticity modulus EcMPa, calculating concrete permission stretching strain is：
When it is 1/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches Δ ε=- 1/3
εtShi Qidong stretching strain yellow early warning, Δ ε=- 1/3 εt≤ stretching strain value ＜ Δ ε=- 2/3 εtFor stretching strain yellow early warning range；
When it is 2/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches Δ ε=- 2/3
εtShi Qidong stretching strain orange warnings, Δ ε=- 2/3 εt≤ stretching strain value ＜ Δs ε=- (2/3 εt+[ε]t) it is that stretching strain is orange pre-
Alert range；
When the consideration initial compressive strain reduction coefficient of the borehole wall is 2/3 and reaches concrete permission stretching strain, the borehole wall is more than needed close
Reach or surpass Δ ε=- (2/3 ε like stretching strain valuet+[ε]t) when start stretching strain red early warning.
It can be seen from the above description that the above embodiments of the present invention realize following technique effect：
A kind of steel string type sensor system being monitored to the borehole wall carries out ground for the deep vertical under existing wellbore conditions
The borehole wall is monitored during layer consolidation grouting, including vibrating-wire concrete strain gauge (3 and 4), steel chord type pressure gauge (5
With 6), cable 7 and computer 9；Several vibrating-wire concrete strain gauges (3 and 4) are arranged at the interior table of the inner layer well wall 2
On face, several described steel chord type pressure gauges (5 and 6) are arranged at the inside of the inner layer well wall 2；Several described steel chord types
Concrete strain gauge (3 and 4) and several described steel chord type pressure gauges (5 and 6) pass through the cable 7 and the measuring instrument 8
Connection, the measuring instrument 8 are connect with the computer 9；The measuring instrument 8 is received by vibrating-wire concrete strain gauge (3 Hes
4) and the steel chord type pressure gauge (5 and 6) acquisition frequency signal, the measuring instrument 8 by the frequency signal be converted to including
The strain value of the borehole wall and the digital signal of pressure value, and the digital signal is passed into the computer 9.
Technical scheme of the present invention solves the prison of the borehole wall during deep vertical stratum consolidation slip casting under existing wellbore conditions
Survey problem, and give by the current force-bearing situation of the borehole wall and the determination method of the borehole wall of determination deformation early warning value, it can fill up
It there is no the deep vertical stratum consolidation Grouting Monitoring System under existing wellbore conditions at present and deform the blank that early warning value determines method,
It is the important component of pit shaft rupture comprehensive treatment scheme, it is ensured that safety in production of the mine during comprehensive treatment, greatly
Ground improves the safety of deep vertical stratum consolidation slip casting, and substantially reduces construction risk, and social and economic benefits are notable.
Compared with the immediate prior art, technical solution provided by the invention has following excellent effect：
Borehole wall monitoring and deformation early warning system during deep vertical stratum slip casting under existing wellbore conditions provided by the invention
System and method pass through what is born simultaneously to the borehole wall using vibrating-wire concrete strain gauge (3 and 4) and steel chord type pressure gauge (5 and 6)
Grouting pressure, borehole wall deformation and borehole wall temperature are monitored, it is ensured that observation system long-term stability and reliability.
The monitoring that grouting pressure is born by the borehole wall to primary layer position, to understand and grasp slip casting suffered by the borehole wall in time
The size and the regularity of distribution of pressure, the grouting pressure setting during instructing pit shaft to administer, and to jeopardize the borehole wall of sidewall safety by
Power is warned；By the monitoring deformed to the primary layer position borehole wall, the stress condition of the borehole wall is understood, judge that the borehole wall uses reliable
Property and safe coefficient, and the guidance of real-time information-aided construction can be provided for the control of grouting pressure during pit shaft comprehensive treatment；
By the monitoring to primary layer position borehole wall temperature, understands the variation of borehole wall temperature, can judge slurry reaction temperature to the borehole wall in time
The influence of temperature change solves the monitoring problem of the borehole wall during deep vertical stratum consolidation slip casting under existing wellbore conditions, and
And give by the current force-bearing situation of the borehole wall and the determination method of the borehole wall of determination deformation early warning value, it can fill up and there is no at present
Deep vertical stratum consolidation Grouting Monitoring System and deformation early warning value determine the blank of method under existing wellbore conditions, are pit shaft ruptures
The important component of comprehensive treatment scheme, it is ensured that safety in production of the mine during comprehensive treatment greatly improves depth
The safety of vertical stratum consolidation slip casting, and construction risk is substantially reduced, social and economic benefits are notable.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of steel string type sensor system being monitored to the borehole wall carries out stratum for the deep vertical under existing wellbore conditions
The borehole wall is monitored during consolidation grouting, and then early warning is carried out to deformation, which is characterized in that
The steel string type sensor system includes：Vibrating-wire concrete strain gauge, steel chord type pressure gauge, cable, measuring instrument and meter
Calculation machine；
Several described vibrating-wire concrete strain gauges are arranged on the inner surface of the borehole wall, several described steel chord type pressures
Power meter is arranged at the inside of the borehole wall；
Several described vibrating-wire concrete strain gauges and several described steel chord type pressure gauges by the cable with it is described
Measuring instrument connects, and the measuring instrument is connect with the computer；
The measuring instrument receives the frequency signal acquired by the vibrating-wire concrete strain gauge and the steel chord type pressure gauge, institute
State the digital signal that the frequency signal is converted to strain value and pressure value including the borehole wall by measuring instrument, and by the number
Word signal passes to the computer.
2. system according to claim 1, which is characterized in that
The vibrating-wire concrete strain gauge is configured in two ways on the inner surface of the borehole wall, and a kind of mode is edge
The inner surface of the borehole wall is vertically arranged, another way is arranged circumferentially along the inner surface of the borehole wall；
The steel chord type pressure gauge is configured in two ways in the inside of the borehole wall, and a kind of mode is along the borehole wall
Internal vertically arranged, another way is arranged circumferentially along the inside of the borehole wall.
3. system according to claim 2, which is characterized in that
The monitor layer of multiple levels is additionally provided with along the vertical direction of the borehole wall；
Each monitor layer includes a cable；
Include four to eight vertically arranged vibrating-wire concrete strain gauges and four to eight in each monitor layer
A vibrating-wire concrete strain gauge being arranged circumferentially, the vertically arranged steel chord type coagulation in a monitor layer
Native strain gauge is identical as the quantity of vibrating-wire concrete strain gauge being arranged circumferentially；
The vertically arranged vibrating-wire concrete strain gauge in a monitor layer is evenly distributed on the borehole wall
On inner surface, the vibrating-wire concrete strain gauge that is arranged circumferentially is evenly distributed on the inner surface of the borehole wall；
Further include having four to eight vertically arranged the steel chord type pressure gauges and four to eight rings in each monitor layer
To the steel chord type pressure gauge of setting, the vertically arranged steel chord type pressure gauge is set with circumferential direction in a monitor layer
The quantity for the steel chord type pressure gauge set is identical；
The vertically arranged steel chord type pressure gauge in a monitor layer is evenly distributed on the inside of the borehole wall, ring
The inside of the borehole wall is evenly distributed on to the steel chord type pressure gauge of setting.
4. system according to claim 1, which is characterized in that
The vibrating-wire concrete strain gauge is fixed on by pedestal and expansion bolt on the inner surface of the borehole wall；
The steel chord type pressure gauge is arranged in the notch opened up on the borehole wall, and the steel chord type pressure gauge is placed in the notch
Bottom, the rest in the notch filled by cement.
5. system according to claim 1, which is characterized in that
It is provided with thermistor in the vibrating-wire concrete strain gauge and/or the steel chord type pressure gauge, by the temperature-sensitive
Resistance measures the temperature value of the borehole wall, and the temperature value passes to the computer by the measuring instrument.
6. system according to claim 2, which is characterized in that
The borehole wall includes outer shaft wall and inner layer well wall, and the outer shaft wall is set in the periphery of the inner layer well wall；It is described
Monitor layer is arranged on the inner layer well wall and is provided with along the vertical direction of the inner layer well wall multiple.
7. it carries out borehole wall monitoring using any one of such as claim 1 to 6 system and deforms the method that early warning value determines, feature
It is, includes the following steps：
Before slip casting, the stratum passed through to the borehole wall is analyzed, and determines the position of monitor layer respectively；
Several measuring points are buried in each monitor layer, and the vibrating-wire concrete strain gauge is installed respectively on the measuring point
With the steel chord type pressure gauge, the vibrating-wire concrete strain gauge and the steel chord type pressure gauge and its conducting wire are passed through into waterproof
Terminal box and the cable connection, the cable is connect with the measuring instrument, the measuring instrument is connect with the computer；
In the bottom water-bearing layers Hou Sha of the borehole wall peripheral stratum, several steel chord type pressure gauges, the steel chord type pressure are set
Meter and its conducting wire by waterproof junction box and the cable connection,
Initial measurement is carried out in installation process and obtains pressure, the primary data of stress and strain, initial measurement is no less than secondary,
The vibrating-wire concrete strain gauge is monitored borehole wall deformation, the monitoring of each hour 1~2 during slip casting
It is monitored daily after secondary, slip casting 1~2 time,
The pressure that the steel chord type pressure gauge is subject to the borehole wall is monitored, the monitoring of each hour 1~2 during slip casting
It is monitored daily after secondary, slip casting 1~2 time,
Thermistor is provided in the vibrating-wire concrete strain gauge and/or the steel chord type pressure gauge to supervise as temperature
Device is surveyed, the temperature monitoring device carries out temperature monitoring to the borehole wall, monitored daily during slip casting 1~2 time, after slip casting
It monitors 1~2 time weekly,
The computer receives and processes the data of the vibrating-wire concrete strain gauge and steel chord type pressure gauge acquisition.
8. the method according to the description of claim 7 is characterized in that further including following steps：
The data that the vibrating-wire concrete strain gauge and the steel chord type pressure gauge acquire are formulated into data record sheet,
Draw pressure, stress, strain change with time relation curve, so that the stress to the borehole wall judges,
In carrying out data handling procedure, abnormal data is rejected according to the treatment principle of measurement error, and carry out repetition measurement in time
Correction；
According to monitoring result, when cataclysm occurs for data variation rate, increase monitoring number.
9. the method according to the description of claim 7 is characterized in that
The borehole wall deformation monitoring, using three-level compressive strain early warning and three-level stretching strain early warning, three-level compressive strain early warning is respectively
The early warning of compressive strain yellow, compressive strain orange warning and compressive strain red early warning, three-level stretching strain early warning are respectively stretching strain yellow
Early warning, stretching strain orange warning and stretching strain red early warning；
The determination of the borehole wall deformation monitoring three-level stretching strain early warning value and three-level compressive strain early warning value, includes the following steps：
The borehole wall external load is calculated by 1.0 times of hydraulic pressure：P=0.01 × h, h are the buried depth of level monitoring, unit is rice；
The ring of the borehole wall inner edge is calculated by the plane strain mechanical model of uniformly distributed external load by Elasticity thick cyclinder outer wall
It is to stress：Wherein, it is rice that R, which is outer radius, the unit of the borehole wall, r be the borehole wall inside radius,
Unit is rice；
It is from the vertical stress of the re-computation monitoring by overlying pit shaft：σz=γ h, γ are the borehole wall unit weight；
Calculating the borehole wall inner edge approximation hoop strain according to the stress-strain relation of elastic plane strain model is：μ is the borehole wall Poisson's ratio；
Concrete crushing strength design value is fc, unit MPa, elasticity modulus Ec, unit MPa, calculate concrete permission
Compressive strain is：
When considering partial safety factor for load 1.35, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.35εtShi Qi
Dynamic pressure strains yellow early warning, Δ ε=[ε]c-1.35εt≤ compressive strain value ＜ Δs ε=[ε]c-1.2εtFor compressive strain yellow early warning model
It encloses；
When considering partial safety factor for load 1.2, the borehole wall approximate compressive strain value more than needed reaches Δ ε=[ε]c-1.2εtShi Qidong
Compressive strain orange warning, Δ ε=[ε]c-1.2εt≤ compressive strain value ＜ Δs ε=[ε]c-εtFor compressive strain orange warning range；
When not considering partial safety factor for load, the borehole wall approximate compressive strain value more than needed reaches or surpasses Δ ε=[ε]c-εtShi Qi
Dynamic pressure strains red early warning；
Concrete tensile strength design value is ftMPa, elasticity modulus EcMPa, calculating concrete permission stretching strain is：
When it is 1/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches Δ ε
=-1/3 εtShi Qidong stretching strain yellow early warning, Δ ε=- 1/3 εt≤ stretching strain value ＜ Δ ε=- 2/3 εtIt is pre- for stretching strain yellow
Alert range；
When it is 2/3 to consider the initial compressive strain reduction coefficient of the borehole wall, the borehole wall approximate stretching strain value more than needed reaches Δ ε
=-2/3 εtShi Qidong stretching strain orange warnings, Δ ε=- 2/3 εt≤ stretching strain value ＜ Δs ε=- (2/3 εt+[ε]t) it is stretching strain
Orange warning range；
When the consideration initial compressive strain reduction coefficient of the borehole wall is 2/3 and reaches concrete permission stretching strain, the borehole wall is rich
Remaining approximation stretching strain value reaches or surpasses Δ ε=- (2/3 εt+[ε]t) when start stretching strain red early warning.
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| CN110441147A (en) * | 2019-08-30 | 2019-11-12 | 湖南科技大学 | A kind of physical simulating device and analogy method of the compression of coal mine shaft lining borehole wall circumferential direction |
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| CN112695814A (en) * | 2020-12-24 | 2021-04-23 | 湖南省交通科学研究院有限公司 | Miniature steel pipe pile stress field rapid monitoring method |
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| CN114216431B (en) * | 2021-12-14 | 2023-09-29 | 安徽理工大学 | Waterproof device and waterproof sealing method for wiring of well drilling wall monitoring sensor |
| CN115340336A (en) * | 2022-09-14 | 2022-11-15 | 山西安能矿山工程有限公司 | Grouting plugging reinforcing high polymer material, preparation method, plugging method and application |
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