CN108051351A - A kind of loose media osmotic grouting simulation experiment method - Google Patents
A kind of loose media osmotic grouting simulation experiment method Download PDFInfo
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- 230000003204 osmotic effect Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004088 simulation Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000007569 slipcasting Methods 0.000 claims abstract description 41
- 238000007596 consolidation process Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 40
- 238000012544 monitoring process Methods 0.000 claims description 20
- 239000011440 grout Substances 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 238000012669 compression test Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0813—Measuring intrusion, e.g. of mercury
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Dispersion Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of loose media osmotic grouting simulation experiment methods.High pressure water is injected into water pocket gum cover by water hole using constant pressure confining pressure pump, confining pressure is provided, the confining pressure provided is more than grouting pressure；Valve gum cover is by confining pressure tight loose media during slip casting, under conditions of confining pressure is more than grouting pressure, it is ensured that loose media slip casting is osmotic grouting, avoids influence of the grouting modes such as compaction grouting and fracture grouting to slip casting effect.The present invention it is easy to operate, can real simulation osmotic grouting reinforce loose media, by valve gum cover wrap up loose media, by water pocket gum cover to loose media Simulation Study On Pressure ground stress environment；By adjusting constant pressure confining pressure pump and slip casting pump pressure confining pressure is made to be more than grouting pressure, loose media osmotic grouting process can be simulated；After slip casting, the consolidation loose media of valve gum cover package, which can completely take out, to be studied；The result of the test that this method obtains has directive significance to actual engineering design.
Description
Technical field
The present invention relates to a kind of loose media osmotic grouting simulation experiment methods, permeate and note suitable for laboratory simulation loose media
Slurry.
Background technology
The problem of reinforcing of loose media osmotic grouting is common in geotechnical engineering, slurries Diffusion Law and slip casting during slip casting
Loose mass mechanics performance is the key that the practice of loose media grouting and reinforcing after reinforcing.During site operation, loose media is mostly one
In fixed stress field, therefore especially deep geotechnical engineering, realizes loose media grouting test laboratory simulation, to actual pine
Granular media Grouting engineering tool has very important significance.
But existing laboratory loose media grouting simulation test device is mostly using filling grouting test, it is impossible to reappear ground
Ambient stress, the loose media consolidated form analytic process after grouting reinforcement are also highly difficult.As Chinese patent CN 105527384A are public
A kind of grouting simulation test device and its test method opened, presence can not apply crustal stress, the monitoring of slurries diffusion process is stranded
It is difficult and the problem of be inconvenient to take out grouting and reinforcing loose media.Therefore how true reappearance scene ground stress environment, realize slurries show
Track and facilitate the analysis of the loose media consolidated form after grouting reinforcement, be urgent problem.
The content of the invention
In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a kind of easy to operate, it being capable of true mould
Intend loose media osmotic grouting to reinforce the stress state of loose media, can realize slurries tracer and facilitate the loose media after grouting reinforcement
Whole take out carries out slurries Diffusion Law and intensive analysis, and obtained result of the test has directive significance to actual engineering design
Osmotic grouting simulation experiment method.
To achieve the above object, the technical solution adopted by the present invention is：A kind of loose media osmotic grouting simulation experiment method,
Comprise the following steps：
(1) loose media filling, pressurization：Fixed grout outlet screw rod, double gum cover confining pressure loaders are placed vertically makes grout outlet
Screw rod is bonded with ground, is smeared vaseline on the circumferential sealing circular arc of half jacket casing and radial seal circular arc of composition valve gum cover and is used
In strengthening sealing effect, valve gum cover is slowly put into inside double gum cover confining pressure loaders, makes its outer wall and water pocket gum cover inner wall
Fitting；The loose media of field sampling is slowly put into inside valve gum cover to concordant with the top of valve gum cover, tightens grouting port
Screw rod；The vertical crustal stress of field measurement is σ1, start constant pressure confining pressure pump, constant pressure confining pressure pump pumps out the high pressure water in high-pressure water
And pass through in confining pressure pipeline input water pocket gum cover, apply confining pressure σ according to live crustal stress is horizontal1, voltage stabilizing 10min；
(2) debugging monitoring：Start monitoring host, it is ensured that monitoring host can obtain pump pressure sensor, grouting port pressure passes
The data of sensor, confining pressure sensor and resistivity sensing element；
(3) grouting parameter is set：The slurries for preparing superfine cement slurries are poured into slurry can, mixer is opened and persistently stirs
It mixes；Start grouting pump, the pressure P of grouting pump is set, makes it identical with live grouting pressure, the pressure σ of constant pressure confining pressure pump1With note
The pressure P of stock pump meets formula one, it is ensured that double gum cover confining pressure loader sealing safety, slip casting process are osmotic grouting：
σ1-P>1MPa formula one
(4) slip casting：Grouting pump is opened, and starts monitoring host simultaneously and starts to monitor, slip casting is obtained by pump pressure sensor
Slip casting pump discharge pressure, the inlet pressure by the double gum cover confining pressure loaders of grouting port pressure sensor acquisition in terminal procedure
Power, the outlet pressure that constant pressure confining pressure pump is obtained by confining pressure sensor obtain different position by each resistivity sensing element
Loose media resistance variations；
(5) slip casting is stopped：For the compacting pourable body that porosity is larger, when slurries are being stopping from the grout outlet outflow moment
The slip casting moment；For grain size is smaller, compacting pourable body of porosity, slurries diffusion length is limited, when resistivity senses member
The resistivity value that part obtains is to stop the slip casting moment after stablizing, and first stops grouting pump at this time, stands 5min, then stops constant pressure confining pressure
Pump opens manual switch valve pressure release, releases high pressure water；
(6) sampling analysis：After complete pressure release, the consolidation loose media that valve gum cover is wrapped up takes out, and treats that slurries are fully consolidated
Valve gum cover gently to be removed afterwards, consolidation loose media is reinforced to form class cylinder, and form analysis is diffused to consolidation loose media,
Φ 50mm × 100mm Standard rock samples is taken to carry out uniaxial compression test, determine uniaxial compressive strength and elasticity modulus；
(7) clean：Slurry can, mixer are cleaned, clear water is poured into clean slurry can, with grouting pump pumping twice, and
Clean grouting pump and Grouting Pipe.
Preferably, the outer diameter of the valve gum cover is identical with water pocket gum cover internal diameter, and the thickness of valve gum cover is 5mm.
Preferably, grouting pump pumps for constant pressure and flow, can realize two kinds of constant pressure, constant current slip casting patterns, constant pressure voltage stabilized range
For 0~6MPa, constant current current stabilization scope is 0~600ml/min；Constant pressure confining pressure pumps 0~25MPa of voltage stabilized range, it can provide 0~
The constant confining pressure of 25MPa.
Compared with the prior art, the present invention has following advantage：
(1) present invention using high pressure water provide confining pressure, pressurization stablize, it is at low cost, water pocket gum cover can by pressurized fluid with
Slip casting fluid thoroughly completely cuts off, easy to operate, and stability is good；Using valve gum cover pre-wrapped loose media, boundary effect is eliminated,
Confining pressure is fastened under the action of grouting reinforcement, and loose media and valve gum cover form an entirety, can have been taken out after the completion of slip casting
Whole slip casting test specimen, it is highly beneficial to the intensive analysis of osmotic grouting effect.
(2) present invention realizes simulation loose media osmotic grouting under the conditions of confining pressure, and constant pressure confining pressure pump passes through water hole to water
High pressure water is injected in capsule gum cover, confining pressure is provided, the confining pressure provided is more than grouting pressure；Valve gum cover is by confining pressure tight
Loose media, under conditions of confining pressure is more than grouting pressure, it is ensured that loose media slip casting is osmotic grouting, avoids compaction grouting and splits
Split influence of the grouting modes such as slip casting to slip casting effect.The present invention method it is easy to operate, can real simulation loose media infiltration
Grouting and reinforcing loose media, obtained result of the test have directive significance to actual engineering design.
(3) the resistivity sensing element of valve gum cover inner surface symmetrical arrangement of the present invention, can obtain loose test specimen along
The real-time change rule of resistance value in diametric(al), by the variation characterization slurries of different position resistance value in oozing at different moments
Saturating position realizes the dynamic tracer to osmotic grouting diffusion process.
Description of the drawings
Fig. 1 is loose media osmotic grouting simulation test device overall schematic；
Fig. 2 is double gum cover confining pressure loader sectional views；
Fig. 3 is the arc-shaped sealed structural representation of valve gum cover；
Fig. 4 is the schematic diagram of embedding flexible current transmission line；
In figure：1st, double gum cover confining pressure loaders；2nd, constant pressure confining pressure pumps；3rd, high-pressure water；4th, confining pressure pipeline；5th, manual switch
Valve；6th, grouting pump；7th, slurry can；8th, mixer；9th, Grouting Pipe；10th, host is monitored；11st, pump pressure sensor；12nd, grouting port pressure
Force snesor；13rd, confining pressure sensor；14th, resistivity sensing element；15th, resistivity transmission line；16th, data transmission link；
17a, clamp nut I；17b, clamp nut II；18th, grouting port screw rod；18a. slip casting passages, 19, grout outlet screw rod；19a. goes out
Starch passage；20th, column casing；21st, water pocket gum cover；21a, the end wing；22nd, valve gum cover；23rd, water hole；24th, circumferential sealing circular arc；25th, footpath
To sealing circular arc；26th, flexible current transmission line；27th, loose media is consolidated.
Specific embodiment
The present invention is described in further detail with reference to embodiment.
It is loose media osmotic grouting simulation test device as shown in Figures 1 to 4, including filling system, confining pressure loading system
With monitoring system,
The confining pressure loading system includes constant pressure confining pressure pump 2 and double gum cover confining pressure loaders 1, double gum cover confining pressure loadings
Device 1 includes column casing 20, I 17a of clamp nut for being located at 20 grouting port one end of column casing, the fastening spiral shell for being located at 20 grout outlet one end of column casing
II 17b of mother, is equipped with valve gum cover 22 in the column casing 20, around being equipped with water pocket between 20 inner wall of 22 outer wall of valve gum cover and column casing
Gum cover 21, I 17a of clamp nut and II 17b of clamp nut are screwed in from both ends in column casing 20 and end is respectively against water pocket glue
Set 21, the end wing 21a at 21 both ends of water pocket gum cover is respectively placed in I 17a of clamp nut, the arc-shaped slot of II 17b ends of clamp nut
In, so that the fixation of water pocket gum cover 21 is more firm, a grouting port screw rod 18 is from the grouting port one of double gum cover confining pressure loaders 1
End is screwed in along axis along clamp nut I 17a, and 18 center of grouting port screw rod is equipped with slip casting passage 18a, a grout outlet screw rod 19 from
Grout outlet one end of double gum cover confining pressure loaders 1 is screwed in along axis along clamp nut II 17a, and in grout outlet screw rod 19 with its axis
Line is parallel to be equipped with multiple pulp passage 19a, the outer diameter of the grouting port screw rod 18 and grout outlet screw rod 19 all with valve gum cover 22
Outer diameter it is identical, the water pocket gum cover 21 be double-layer hollow cylinder, and double-layer hollow cylinder in the middle part of be equipped with water hole 23, constant pressure confining pressure
The outlet of pump 2 is connected to water hole 23 by confining pressure pipeline 4, and constant pressure confining pressure pump 2 injects height by water hole 23 into water pocket gum cover 21
Water is pressed to provide confining pressure, the confining pressure provided is more than grouting pressure, it is ensured that slip casting is osmotic grouting, and valve gum cover 22 is tight by confining pressure
Close package loose media；
The filling system includes slurry can 7, between slurry can 7 and the grouting port screw rod 18 of double gum cover confining pressure loaders 1
It is connected by grouting pipeline 9, and grouting pipeline 9 is equipped with grouting pump 6, and mixer 8 is equipped in slurry can 7, grouting pump 6 will be stored up and starched
Slurries in tank 7 are transported to by grouting pipeline 9 in the space at double 1 centers of gum cover confining pressure loader；
The monitoring system includes monitoring host 10, pump pressure sensor 11, grouting port pressure sensor 12, confining pressure sensor
13 and multiple resistivity sensing elements 14, the pump pressure sensor 11 be located at 6 exit of grouting pump, grouting port pressure sensor 12
It is located at the grouting port of double gum cover confining pressure loaders 1, confining pressure sensor 13 is located at the outlet of constant pressure confining pressure pump 2, multiple resistivity
The length direction of sensing element 14 along valve gum cover 22 is distributed on 22 internal face of valve gum cover, is spaced 80mm, pump pressure sensing successively
Device 11, grouting port pressure sensor 12, confining pressure sensor 13 are electrically connected respectively with monitoring host 10 by data transmission link 16,
And resistivity sensing element 14 is connected to monitoring host 10, pump pressure sensor 11, grouting port pressure by resistivity transmission line 15
Force snesor 12 and confining pressure sensor 13 detect 6 outlet pressure of grouting pump, double 1 inlet pressures of gum cover confining pressure loader and perseverance respectively
Press confining pressure pump 2 outlet pressures, multiple resistivity sensing elements 14 be distributed on along its length 22 internal face of valve gum cover and with pine
Granular media is bonded, and can be detected the change in resistance at the different position of loose media in slurries flow event, and be passed by resistivity
Defeated circuit 15 reaches monitoring host 10 in real time, so that it is determined that slurries diffusion process.Above-mentioned pump pressure sensor 11, grouting port pressure pass
Diffused silicon pressure transmitter may be employed in sensor 12 and confining pressure sensor 13.
Preferably, the valve gum cover 22 is made of symmetrically arranged two and half jacket casing, and half jacket casing passes through circumferential close
Envelope circular arc 24 and radial seal circular arc 25 are spliced together.The seam of half jacket casing uses bicircular arcs structure, real under confining pressure effect
It now seals, can avoid the generation of seepage channel, valve gum cover 22 can eliminate the consolidation loose media 27 of formation by compressive deformation
With the boundary effect of 22 internal face contact position of valve gum cover.
Preferably, the length of valve gum cover 22 is less than the length of water pocket gum cover 21, and 18 length of grouting port screw rod is more than fastening
The length of I 17a of nut, the length of grout outlet screw rod 19 are more than the length of II 17b of clamp nut, can be by water pocket gum cover 21
Pressure realizes better seal.
Preferably, 21 internal diameter size of water pocket gum cover is Φ 120mm × 230mm, and 22 outer diameter of valve gum cover is Φ 120mm
×200mm。
Preferably, the water pocket gum cover 21 is cylindrical shape, and end wing 21a is 5mm thickness, the entity glue of 15mm wide.
Preferably, resistivity sensing element 14 is connected by the flexible current transmission line 26 being embedded in 22 inner wall of valve gum cover
It is connected to resistivity transmission line 15.During resistivity monitoring, each resistivity sensing element 14 monitors to be replaced successively, it is ensured that is formed single
Channel current.
Further, confining pressure pipeline 4 is equipped with manual switch valve 5.It is closed during slip casting, opens and let out after slip casting
Pressure so as to simulate deep granular media ambient stress, disclosure satisfy that confining pressure is more than grouting pressure, it is ensured that simulation test is noted for infiltration
Slurry.
Preferably, 9 internal diameter 12mm of Grouting Pipe, larger internal diameter can carry out granular pattern slurries slip casting without plugging.
Preferably, the internal diameter size of column casing 20 is Φ 150mm × 300mm, wall thickness 20mm.It can be ensured that consolidation loose media 27
It can meet along the requirement that Φ 50mm × 100mm Standard rock samples is radially taken to carry out mechanical analysis, and can reduce the size as far as possible, letter
Change experiment difficulty.
The loose media osmotic grouting simulation experiment method carried out using above device, is comprised the following steps：
(1) loose media filling, pressurization：Fixed grout outlet screw rod 19, double gum cover confining pressure loaders 1 are placed vertically makes pulp
Mouth screw rod 19 is bonded with ground, is applied on the circumferential sealing circular arc 24 of half jacket casing and radial seal circular arc 25 of composition valve gum cover 22
Vaseline is smeared for strengthening sealing effect, valve gum cover 22 is slowly put into inside double gum cover confining pressure loaders 1, make its outer wall and
21 inner wall of water pocket gum cover is bonded；The loose media of field sampling is slowly put into 22 inside of valve gum cover to the top with valve gum cover 22
Portion is concordant, tightens grouting port screw rod 18；The vertical crustal stress of field measurement is 10MPa, starts constant pressure confining pressure pump 2, constant pressure confining pressure pump 2
Water in high-pressure water 3 is pumped out and passes through confining pressure pipeline 4 and is inputted in water pocket gum cover 21, is enclosed according to horizontal apply of live crustal stress
Press σ1=10MPa, voltage stabilizing 10min；
(2) debugging monitoring：Start monitoring host 10, it is ensured that monitoring host 10 can obtain pump pressure sensor 11, grouting port
The data of pressure sensor 12, confining pressure sensor 13 and resistivity sensing element 14；
(3) grouting parameter is set：Superfine cement slurries (the ratio of mud 1 will be prepared:1, superfine cement be 1250 mesh) slurries
It pours into slurry can 7, opens mixer 8 and persistently stir；Start grouting pump 6, grouting pump 6 is set according to live grouting pressure 1MPa
Pressure P=1MPa, constant pressure confining pressure pump 2 pressure σ1The relation for meeting formula one is needed with the pressure P of grouting pump 6：
σ1-P>1MPa formula one
It just can ensure that double gum cover confining pressure loaders 1 seal safety, slip casting process is osmotic grouting, σ in this embodiment1=
10MPa, P=1MPa meet osmotic grouting requirement.
(4) slip casting：Grouting pump 6 is opened, and starts monitoring host 10 simultaneously and starts to monitor, is obtained by pump pressure sensor 11
6 outlet pressure of grouting pump in slip casting terminal procedure obtains entering for double gum cover confining pressure loaders 1 by grouting port pressure sensor 12
Mouthful place's pressure, obtained by confining pressure sensor 13 constant pressure confining pressure pump 2 outlet pressure, obtained by each resistivity sensing element 14
Obtain the loose media resistance variations of different position.
(5) slip casting is stopped：For the compacting pourable body that porosity is larger, when slurries are being stopping from the grout outlet outflow moment
The slip casting moment；For grain size is smaller, compacting pourable body of porosity, slurries diffusion length is limited, when resistivity senses member
The resistivity value that part 14 obtains stablize it is constant after to stop the slip casting moment, first stop grouting pump 6 at this time, stand 5min, then stop
Constant pressure confining pressure pump 2 opens 5 pressure release of manual switch valve, releases high pressure water.
(6) sampling analysis：After complete pressure release, the consolidation loose media 27 that valve gum cover 22 wraps up is taken out, treats that slurries are complete
Valve gum cover 22 is gently removed after consolidation, consolidation loose media 27, which is reinforced, forms a 140mm or so high class cylinder, to solid
Knot loose media 27 is diffused form, Standard rock sample intensive analysis；Φ 50mm × 100mm Standard rock samples is taken to carry out uniaxial compression examination
It tests, finally definite uniaxial compressive strength is 2.98MPa, elasticity modulus 239.09MPa.
(7) clean：Slurry can 7, mixer 8 are cleaned, pouring into clear water in clean slurry can 7, (chemical pulp pours into dissolving
Agent), with 6 pumping of grouting pump twice, and clean grouting pump 6 and Grouting Pipe 9.
The outer diameter for the valve gum cover 22 used in the above method is identical with 21 internal diameter of water pocket gum cover, and the thickness of valve gum cover 22
It spends for 5mm.Preferably, grouting pump 6 pumps for constant pressure and flow, can realize two kinds of constant pressure, constant current slip casting patterns, constant pressure voltage stabilized range
For 0~6MPa, constant current current stabilization scope is 0~600ml/min；Constant pressure confining pressure pumps 2 0~25MPa of voltage stabilized range, it can provide 0~
The constant confining pressure of 25MPa.
Claims (3)
1. a kind of loose media osmotic grouting simulation experiment method, which is characterized in that comprise the following steps：
(1) loose media filling, pressurization：Fixed grout outlet screw rod (19), double gum cover confining pressure loaders (1) are placed vertically makes pulp
Mouth screw rod (19) is bonded with ground, in the circumferential sealing circular arc (24) of half jacket casing of composition valve gum cover (22) and radial seal circular arc
(25) vaseline is smeared on for strengthening sealing effect, valve gum cover (22) is slowly put into double gum cover confining pressure loaders (1)
Portion makes its outer wall be bonded with water pocket gum cover (21) inner wall；It is internal that the loose media of field sampling is slowly put into valve gum cover (22)
It is extremely concordant with the top of valve gum cover (22), tighten grouting port screw rod (18)；The vertical crustal stress of field measurement is σ1, start constant pressure
Confining pressure pumps (2), and constant pressure confining pressure pumps (2) and pumps out the high pressure water in high-pressure water (3) and pass through confining pressure pipeline (4) input water pocket glue
It covers in (21), applies confining pressure σ according to live crustal stress is horizontal1, voltage stabilizing 10min；
(2) debugging monitoring：Start monitoring host (10), it is ensured that monitoring host (10) can obtain pump pressure sensor (11), slip casting
The data of mouth pressure sensor (12), confining pressure sensor (13) and resistivity sensing element (14)；
(3) grouting parameter is set：The slurries for preparing superfine cement slurries are poured into slurry can (7), mixer (8) is opened and continues
Stirring；Start grouting pump (6), the pressure P of grouting pump (6) is set, makes it identical with live grouting pressure, constant pressure confining pressure pump (2)
Pressure σ1Meet formula one with the pressure P of grouting pump (6), it is ensured that double gum cover confining pressure loader (1) sealing safety, slip casting process
For osmotic grouting：
σ1-P>1MPa formula one
(4) slip casting：Grouting pump (6) is opened, and starts monitoring host (10) simultaneously and starts to monitor, is obtained by pump pressure sensor (11)
It obtains grouting pump (6) outlet pressure in slip casting terminal procedure, pass through the double gum cover confining pressures loadings of grouting port pressure sensor (12) acquisition
The pressure at inlet of device (1) obtains the outlet pressure of constant pressure confining pressure pump (2) by confining pressure sensor (13), passes through each resistance
Rate sensing element (14) obtains the loose media resistance variations of different position；
(5) slip casting is stopped：For the compacting pourable body that porosity is larger, when slurries are being stopping slip casting from the grout outlet outflow moment
Moment；For grain size is smaller, compacting pourable body of porosity, slurries diffusion length is limited, when resistivity sensing element
(14) to stop the slip casting moment after the resistivity value obtained is stablized, first stop grouting pump (6) at this time, stand 5min, then stop permanent
Confining pressure pump (2) is pressed, manual switch valve (5) pressure release is opened, releases high pressure water；
(6) sampling analysis：After complete pressure release, the consolidation loose media (27) of valve gum cover (22) package is taken out, treats that slurries are complete
Valve gum cover (22) is gently removed after consolidation, consolidation loose media (27) is reinforced and forms class cylinder, to consolidation loose media (27)
Form analysis is diffused, Φ 50mm × 100mm Standard rock samples is taken to carry out uniaxial compression test, determine uniaxial compressive strength and bullet
Property modulus；
(7) clean：Slurry can (7), mixer (8) are cleaned, clean slurry can pours into clear water in (7), with grouting pump (6) pumping
Twice, grouting pump (6) and Grouting Pipe (9) are cleaned and.
2. loose media osmotic grouting simulation experiment method according to claim 1, which is characterized in that the valve gum cover
(22) outer diameter is identical with water pocket gum cover (21) internal diameter, and the thickness of valve gum cover (22) is 5mm.
3. loose media osmotic grouting simulation experiment method according to claim 1, which is characterized in that the grouting pump (6)
It is pumped for constant pressure and flow, constant pressure voltage stabilized range is 0~6MPa, and constant current current stabilization scope is 0~600ml/min；Constant pressure confining pressure pump (2) is steady
Press 0~25MPa of scope.
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| CN114279934A (en) * | 2021-12-28 | 2022-04-05 | 中国海洋大学 | Island reef water-rich calcareous sandy soil stratum grouting simulation and permeability test device and method |
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