CN111006951A - Indoor grouting test device and simulated grouting test method - Google Patents

Indoor grouting test device and simulated grouting test method Download PDF

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Publication number
CN111006951A
CN111006951A CN201911111263.9A CN201911111263A CN111006951A CN 111006951 A CN111006951 A CN 111006951A CN 201911111263 A CN201911111263 A CN 201911111263A CN 111006951 A CN111006951 A CN 111006951A
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China
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grouting
foundation soil
indoor
pressure
test device
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孟凡衍
陈仁朋
吴怀娜
刘源
康馨
杨微
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Hunan University
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Hunan University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001Type of application of the stress
    • G01N2203/0005Repeated or cyclic
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0682Spatial dimension, e.g. length, area, angle

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to the technical field of grouting engineering, and particularly discloses an indoor grouting test device which comprises a grouting unit, a loading unit and a measuring unit, wherein the grouting unit comprises a grouting experiment barrel, a grouting pump, a grouting channel and a grouting pipe, and the grouting pump is communicated with the grouting pipe through the grouting channel; the loading unit comprises a confining pressure loading mechanism and a servo power loading mechanism to simulate formation pressure, and the servo power loading mechanism is rigidly connected with the grouting pipe to provide vertical load; the measuring unit can measure formation disturbance parameters caused by grouting. In addition, the invention also discloses a simulated grouting test method. The indoor grouting test device can simulate the synergistic effect of tunnel, grouting body and foundation in actual engineering, so as to research the influence rule of grouting on the disturbance of surrounding strata and dynamic response.

Description

Indoor grouting test device and simulated grouting test method
Technical Field
The invention relates to the technical field of grouting engineering, in particular to an indoor grouting test device. Furthermore, the invention relates to a simulated grouting test method.
Background
At present, the grouting technology is continuously improved and developed, and is widely applied to the aspects of foundation reinforcement, waterproof curtains, seepage prevention and leakage stoppage and the like. Grouting is a complex process, and the complexity of the stratum causes the slurry diffusion theory to have a large difference from the practical engineering application, and grouting parameters are often determined through experiments. Thus, laboratory tests have become an important means to study the diffusion pattern of the slurry.
For saturated soft clay stratum, grouting can disturb the surrounding stratum, so that structural damage and compressibility of a soil body are increased, and continuous development of primary consolidation and secondary consolidation settlement after stratum construction is caused. In addition, the train cyclic load after the tunnel is built and operated can also cause considerable deformation of the disturbed foundation soil. The subway tunnel operation in Shanghai, Hangzhou and other places has large accumulated settlement and uneven settlement till now, which may be related to stratum disturbance caused by synchronous grouting and secondary grouting in the construction period. The larger grouting amount or grouting pressure can effectively control the tunnel settlement in a short time, but can also cause excessive disturbance of soil mass and possibly cause the tunnel to settle for a longer time under the action of train cyclic load. Currently, a large number of field tests have been performed by related researchers and construction enterprises for grouting technology. However, the field test needs to consume a large amount of manpower and material resources, is low in economical efficiency, and meanwhile, the field environment is complex, so that the influence of certain specific factors, such as grouting parameters, formation properties, cyclic load types and the like, is difficult to study.
In view of this, need design a novel indoor slip casting test device, study slip casting is to surrounding stratum disturbance and dynamic response influence law, further revel soft soil foundation shield tunnel post-construction settlement development mechanism.
Disclosure of Invention
The invention aims to solve the technical problem of providing an indoor grouting test device which can simulate the synergistic effect of a tunnel, a grouting body and a foundation in actual engineering and reflect the influence rule of grouting on the disturbance and the dynamic response of surrounding strata.
In addition, the invention also aims to solve the problem of providing a simulated grouting test method, which can simulate the synergistic effect of tunnel-grouting body-foundation in actual engineering and reflect the influence rule of grouting on the disturbance and dynamic response of surrounding strata.
In order to solve the technical problems, the invention provides an indoor grouting test device which comprises a grouting unit, a loading unit and a measuring unit, wherein the grouting unit comprises a grouting experiment barrel, a grouting pump, a grouting channel and a grouting pipe, and the grouting pump is communicated with the grouting pipe through the grouting channel; the loading unit comprises a confining pressure loading mechanism and a servo power loading mechanism to simulate formation pressure, and the servo power loading mechanism is rigidly connected with the grouting pipe to provide vertical load; the measuring unit can measure formation disturbance parameters caused by grouting.
As a specific structure of the present invention, the confining pressure loading mechanism includes an air bag and an air pressure controller, the air bag is sleeved in the inner wall of the grouting experiment barrel, and the air pressure controller can adjust the internal air pressure of the air bag.
As a specific structure of the present invention, the servo power loading mechanism includes a top seat, a reaction frame, a servo power loading device, and an axial force meter, the top seat has a circular hole for accommodating the grouting pipe, the lower end of the reaction frame is connected to a grouting experiment barrel, the upper end of the reaction frame is connected to the servo power loading device, the top seat is rigidly connected to the grouting pipe, and the servo power loading device applies a load to the grouting pipe through the axial force meter.
Preferably, the grouting unit further comprises a flow meter and a pressure meter, and the flow meter and the pressure meter are arranged on the grouting channel.
Specifically, the slip casting pipe is provided with a valve, and the pipe wall of the slip casting pipe is provided with a plurality of slip casting holes.
Preferably, an agitator is arranged in the grouting pump.
Specifically, the lateral wall of slip casting experiment bucket is equipped with the circuit preformed hole, the lower part of the lateral wall of slip casting experiment bucket is equipped with the wash port.
Preferably, the measuring unit comprises a soil pressure gauge, a hole pressure gauge, a piezoelectric bending element, a displacement sensor and a data acquisition system, the displacement sensor is arranged on the side wall of the grouting experiment barrel, a measuring head of the displacement sensor is connected with the top seat, and lines of the soil pressure gauge, the hole pressure gauge, the piezoelectric bending element and the displacement sensor are all connected with the data acquisition system.
The invention also provides a simulated grouting test method, which comprises the following steps:
s01, manufacturing foundation soil, and putting a sensor into the foundation soil;
s02, applying vertical pressure and confining pressure to the foundation soil to simulate formation pressure;
s03, injecting the slurry into the foundation soil;
s04, applying vertical dynamic load to the foundation soil by using a servo motor;
and S05, acquiring the stratum disturbance parameters of the foundation soil when the foundation soil is subjected to vertical dynamic load through the sensor.
In the basic technical scheme, the indoor grouting experiment device can simulate the in-situ stress state of the foundation soil and the stratum disturbance rule and the dynamic response rule of the foundation soil when the grouted foundation soil is loaded, is particularly suitable for simulating the synergistic effect of a tunnel, a grouting body and a foundation in actual engineering, can simulate the circulating load generated by the running of a subway train by applying a vertical dynamic load through the servo power loading mechanism, researches the mechanics and deformation response of the tunnel, the foundation soil and the grouting system under the action of the vertical dynamic load through the data collected by the measuring unit, and is beneficial to disclosing the soft foundation shield tunnel post-construction settlement development mechanism.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic diagram of an exemplary embodiment of an indoor grouting experiment apparatus of the present invention after grouting;
FIG. 2 is a schematic diagram of an exemplary embodiment of an indoor grouting experiment apparatus of the present invention before grouting;
fig. 3 is a sectional view a-a of fig. 1.
Description of the reference numerals
11 grouting experiment barrel 12 grouting pump
13 grouting channel 14 grouting pipe
15 flowmeter 16 pressure gauge
17 stirrer 18 line preformed hole
19 drainage hole
21 air bag 22 air pressure controller
23 top seat 24 reaction frame
25 servo power loading device 26 axial force meter
31-earth pressure gauge 32-hole pressure gauge
33 piezoelectric bending element 34 displacement sensor
35 data acquisition system
41 first permeable stone 42 second permeable stone
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "disposed" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; the two elements may be connected directly or indirectly through intervening media, or may be connected through one another or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be understood that, as shown in fig. 1, "upper" and "lower" are the same as the upper and lower side orientations that the grouting test device is normally used in, and the terms are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, the indoor grouting test device according to the basic technical scheme of the present invention includes a grouting unit, a loading unit and a measuring unit, where the grouting unit includes a grouting experiment barrel 11, a grouting pump 12, a grouting channel 13 and a grouting pipe 14, and the grouting pump 12 is communicated with the grouting pipe 14 through the grouting channel 13; the loading unit comprises a confining pressure loading mechanism and a servo power loading mechanism to simulate formation pressure, and the servo power loading mechanism is rigidly connected with the grouting pipe 14 to provide vertical load; the measuring unit is used for measuring a stratum disturbance rule caused by grouting.
In the basic technical scheme, the indoor grouting experimental device can simulate the stress state of the foundation soil in the whole grouting process: namely the stress state of the foundation soil before grouting, after grouting and after grouting when dynamic load is applied, and the measuring unit can reflect the disturbance and dynamic response of the foundation soil in the whole grouting process. When the indoor grouting experiment device is used, firstly, foundation soil in a slurry state is filled in a grouting experiment barrel 11, and the foundation soil is manufactured in a layered consolidation mode; secondly, after foundation soil is manufactured, confining pressure and vertical pressure are applied to the foundation soil through a confining pressure loading mechanism and a servo power loading mechanism respectively so as to simulate the formation pressure at different stratum heights; then, inserting the grouting pipe 14 into the foundation soil for grouting; and finally, after grouting, applying a sinusoidal load by a servo power loading mechanism to simulate the dynamic load generated by train running on the tunnel after grouting, and comprehensively obtaining the mechanics and deformation response of the foundation soil under the action of the vertical dynamic load by a measurement unit.
The indoor grouting experiment device can simulate the disturbance rule and the dynamic response rule of the foundation soil in the whole grouting process, is particularly suitable for simulating the synergistic action of tunnel-grouting body-foundation in actual engineering, and the servo power loading mechanism can simulate the cyclic load generated by a subway train. The indoor grouting experimental device can be used for researching the influence rule of grouting on soft soil foundation disturbance and dynamic response more economically and effectively.
As a preferable structural form, the confining pressure loading mechanism comprises an air bag 21 and an air pressure controller 22, the air bag 21 is sleeved in the inner wall of the grouting experiment barrel 11, the outer wall of the air bag 21 is tightly attached to the inner wall of the grouting experiment barrel, and the material of the air bag 21 can be rubber or silica gel with good elasticity. The air pressure controller 22 is used for adjusting the internal air pressure of the air bag 21, the stress state of the foundation soil is sampled by the measuring unit, the opening sizes and the switching time of the air inlet valve and the air exhaust valve are controlled, if the confining pressure of the foundation soil is too large, the air exhaust valve is opened and communicated with the vacuum pump, the air is pumped out of the air bag 21, and the confining pressure of the foundation soil is reduced; on the contrary, if the confining pressure of the foundation soil is too small, the air inlet valve is opened to be communicated with the air bottle, the air enters the air bag 21, and the confining pressure of the foundation soil is increased, so that the air pressure controller 22 controls the air pressure inside the air bag 21 to simulate the formation pressures with different sizes under different conditions.
As a preferred structural style, the servo power loading mechanism includes a top seat 23, a reaction frame 24, a servo power loading device 25 and an axial force meter 26, the upper end of the reaction frame 24 is connected with the servo power loading device 25, the lower end of the reaction frame 24 is connected with the barrel body of the grouting experiment barrel 11, or the bottom of the grouting experiment barrel 11 is provided with a base with a radial dimension larger than the barrel body, the lower end of the reaction frame 24 is connected with the base, or the lower end of the reaction frame 24 can be directly fixed on the desktop, so that the grouting experiment barrel 11 is prevented from deforming and the reliability of experiment data is prevented from being influenced due to the connection between the reaction frame 24 and the grouting experiment barrel 11. The reaction frame 24 may be a cross-shaped reaction frame having four end points or a straight reaction frame having two end points, and the reaction frame 24 is capable of providing a reaction force when the servo power loading 25 device is operated. Referring to fig. 2, the servo power loading device 25 uniformly applies load to the foundation soil through the top seat 23 before grouting, the grouting pipe 14 is rigidly connected with the top seat 23 after grouting, and the load is directly applied to the grouting pipe 14 without removing the grouting pipe 14, so that the operation is convenient, and the grouting pipe 14 protrudes out of the top seat 23 by a certain height so that a grouting port of the grouting pipe 14 is connected with the grouting channel 13 for grouting. The servo power loading device 25 applies load to the top seat 23 or the grouting pipe 14 through the shaft force meter 26, the vertical load can be observed through the shaft force meter 21, and the load is accurately controlled through the servo power loading device 25. Wherein the servo power loading device 25 can be an electro-hydraulic servo actuator; a servomotor that provides a power supply and a ball screw that converts the output of the servomotor into an axial displacement that matches the external demand can also be used in combination. Under this kind of structure, the required vertical load in the foundation soil preparation process and the dynamic load that applys after the slip casting are provided by servo power loading device 25, have simplified this indoor slip casting experimental apparatus's structure, and it is more convenient to operate, and the cost is cheaper.
Preferably, the grouting unit further comprises a flow meter 15 and a pressure gauge 16, wherein the flow meter 15 and the pressure gauge 16 are arranged on the grouting channel 13, so that the grouting amount and the grouting pressure can be more accurately controlled, and the actual situation of field grouting can be simulated.
Preferably, slip casting pipe 14 is equipped with the valve, the lateral wall of slip casting pipe 14 is equipped with a plurality of injected holes, can start or stop the slip casting through opening and close the valve, and slip casting pump 12 is connected to slip casting passageway 13 one end, and slip casting pipe 14 is connected to one end to slip casting passageway 13 with the slip casting mouth of slip casting pipe 14 passes through sealing connection, if realize slip casting pipe 14 and slip casting passageway 13's zonulae occludens such as through means such as clamp, staple bolt, avoids the thick liquid to reveal.
Preferably, the slurry pump 12 is provided with an agitator 17 to maintain continuous agitation during the slurry injection process, thereby ensuring that the slurry maintains uniformity and fluidity under high pressure and small convection.
Specifically, the grouting experiment barrel 11 is a rigid cylinder, a line preformed hole 18 is formed in the side wall of the grouting experiment barrel 11, after the sensors in the measurement unit are fixed, the relevant lines are led out of the grouting experiment barrel 11 through the line preformed hole 18, and a drain hole 19 is formed in the lower portion of the side wall of the grouting experiment barrel 11 and facilitates timely drainage when foundation soil is manufactured.
Specifically, referring to fig. 1 and 3, the measuring unit includes an earth pressure gauge 31, a pore pressure gauge 32, a piezoelectric bending element 33, a displacement sensor 34 and a data acquisition system 35, wherein the earth pressure gauge 31, the pore pressure gauge 32, the piezoelectric bending element 33 and the displacement sensor 34 are respectively used for measuring the earth pressure, the pore water pressure, the vertical displacement and the change of the shear wave velocity of the foundation soil and the dynamic response under the action of the vertical load. The displacement sensor 34 is arranged on the side wall of the grouting experiment barrel 11, a measuring head of the displacement sensor is connected with the top seat 23, other sensors are placed in foundation soil in the process of manufacturing the foundation soil, the lines of the soil pressure gauge 31, the hole pressure gauge 32, the piezoelectric bending element 33 and the displacement sensor 34 are all connected with the data acquisition system 35, and of course, other types of sensors can be arranged to acquire parameters of disturbance and dynamic response of other grouting on the foundation soil.
In the preferred embodiment of the invention, the indoor grouting experiment device comprises a grouting unit, a loading unit and a measuring unit, wherein the grouting unit comprises a rigid grouting experiment barrel 11, a grouting pump 12, a grouting channel 13 and a grouting pipe 14, a line reserved hole 18 is formed in the side wall of the grouting experiment barrel 11, and a water drainage hole 19 is formed in the lower part of the side wall; a stirrer 17 is arranged in the grouting pump 12; a flow meter 15 and a pressure gauge 16 are arranged on the grouting channel 13; slip casting pipe 14 is equipped with the valve and its lateral wall is equipped with a plurality of slip casting holes, and the slip casting unit mainly used carries out the slip casting to foundation soil: after the grouting pipe 14 is inserted into the foundation soil, the flow meter 15 and the pressure gauge 16 on the grouting channel 13 are observed, the corresponding parameters of the grouting pump 12 are adjusted, the grout with proper volume is injected at the required grouting pressure, the grout is injected into the foundation soil from the grouting hole under high pressure, and the start and stop of the grouting process can be controlled by controlling the opening and closing of a valve on the grouting pipe 14. The loading unit comprises a confining pressure loading mechanism and a servo power loading mechanism, wherein the confining pressure loading mechanism comprises an air bag 21 and an air pressure controller 22, the air bag 21 is sleeved in the inner wall of the grouting experiment barrel 11, the air pressure controller 22 is used for adjusting the internal air pressure of the air bag 21, and the air bag 21 extrudes foundation soil to generate confining pressure; servo power loading mechanism includes footstock 23, reaction frame 24, servo power loading device 25 and axial force meter 26, reaction frame 24 lower extreme and slip casting experiment bucket 11's base fixed connection, the upper end with servo power loading device 25 is connected, and axial force meter 26 is located footstock 23 and reaction frame 24 are middle, when simulation formation pressure, covers footstock 23 on foundation soil upper surface, and servo power loading device 25 passes through footstock 23 and applys vertical load to foundation soil, simultaneously, adjusts the inside atmospheric pressure of gasbag 21, like this, gasbag 21 and footstock 23 exert pressure to foundation soil jointly, can the accurate simulation formation pressure under the different conditions. The measuring unit includes soil pressure gauge 31, hole pressure gauge 32, piezoelectricity bending element 33, displacement sensor 34 and number collection system 35, displacement sensor 34 locates slip casting experiment bucket 11's lateral wall, its gauge head with footstock 23 is connected for detect the vertical displacement of footstock 23, soil pressure gauge 31, hole pressure gauge 32, piezoelectricity bending element 33 and displacement sensor 34's circuit all pass slip casting experiment bucket 11 the circuit preformed hole 18 with number collection system 35 connects, and the display panel through number collection system 35 can be quick obtains the influence rule of slip casting to foundation soil disturbance and dynamic response.
In another aspect, the present invention further provides a simulated grouting test method, which is described below with reference to the grouting experiment apparatus in the above preferred embodiment.
S01, manufacturing foundation soil, and putting a sensor into the foundation soil. Referring to fig. 2, a first permeable stone 41 is placed at the bottom of a grouting experiment barrel 11, the radial dimension of the first permeable stone 41 is approximately equal to the inner diameter dimension of the grouting experiment barrel 11, a layer of filter paper covers the upper surface of the first permeable stone 42, remolded foundation soil in a slurry state is poured into the grouting experiment barrel 11, a second permeable stone 42 and a top seat 23 are sequentially covered on the upper surface of the foundation soil, the top seat 23 is vertically pressurized through a servo power loading device 25 to realize layered consolidation, the first permeable stone 41 and the second permeable stone 42 realize double-sided drainage when the foundation soil is layered consolidated, when the foundation soil is layered consolidated to a certain height, sensors such as a soil pressure gauge 31, a pore pressure gauge 32 and a piezoelectric bending element 33 are embedded at corresponding positions of the foundation soil, a displacement sensor 34 is installed on the side wall of the grouting experiment barrel 11, a measuring head of the displacement sensor is connected with the top seat 23, and after the foundation soil is consolidated, the second permeable stone 42 is taken out.
And S02, applying vertical pressure and confining pressure to the foundation soil to simulate formation pressure. Referring to fig. 1 and 3, the top seat 23 is covered on the upper surface of the foundation soil, and vertical pressure and confining pressure are respectively applied to the foundation soil through the servo power loading device 25 and the air bag 21, and the values of the axial force meter 26 and the air pressure controller 22 are observed, so that the foundation soil reaches the in-situ stress state required by the experiment.
And S03, injecting the slurry into the foundation soil. The grouting pipe 14 penetrates through a circular hole in the center of the top seat 23, is inserted into foundation soil and is rigidly connected with the top seat 23, the grouting channel 13 and the grouting pipe 14 are connected in a hoop or hoop sealing mode, the grouting pump 12 is started to pour the grout with a certain proportion into the foundation soil, the stirrer 17 in the grouting pump 12 is kept in a working state in the grouting process, and the grouting flow and the grouting pressure are recorded through the flowmeter 15 and the pressure gauge 16. The rigid connection mode can adopt a hook head wedge key, key grooves are correspondingly formed in the center circular holes of the grouting pipe 14 and the top seat 23, and the hook head wedge key is inserted into the key grooves to realize rigid connection of the grouting pipe 14 and the top seat 23; or the outer wall of the grouting pipe 14 is provided with a flange, the flange is provided with a through hole, the top seat 23 is correspondingly provided with a threaded hole, and a screw passes through the through hole on the flange and the threaded hole on the top seat 23 to realize the rigid connection of the grouting pipe 14 and the top seat 23.
And S04, applying vertical dynamic load to the foundation soil by using a servo motor. After grouting, the grouting channel 13 is taken down, the lower end of the shaft force meter 26 is in contact with a grouting opening of the grouting pipe 14, the servo power loading device 25 applies vertical sinusoidal load to the grouting opening for simulating cyclic load of a subway train on a tunnel after grouting, and certainly, loads in other forms can be applied to the foundation soil through the servo power loading device 25 to simulate other complex loads borne by the foundation soil after grouting.
And S05, acquiring the stratum disturbance parameters of the foundation soil when the foundation soil is subjected to vertical dynamic load through the sensor. When the foundation soil is manufactured, various sensors are as follows: the soil pressure gauge 31, the pore pressure gauge 32, the piezoelectric bending element 33 and the displacement sensor 34 are installed, so that the indoor grouting experiment device can realize simulation of the whole grouting process, and the measurement unit can record parameters of foundation soil disturbance and dynamic response in the whole grouting process and comprehensively reflect the influence rule of grouting on surrounding stratum disturbance and dynamic response.
The simulation grouting test method provided by the invention can simulate the disturbance and dynamic response of the whole grouting process to the foundation soil, reveal the stratum disturbance rule caused by grouting, and the whole body formed by the footstock 23, the grouting body and the foundation soil is particularly suitable for simulating the tunnel-grouting body-foundation synergistic action in practical engineering, and applying vertical dynamic load to the foundation soil to simulate the cyclic load generated by the running of a subway train, so that the mechanics and deformation response of the tunnel-foundation soil-grouting system under the action of the vertical dynamic load generated by the subway train can be obtained, and the test result can provide beneficial reference for the soft soil stratum shield tunnel grouting reinforcement technology. The indoor grouting test device provided by the invention can accurately simulate the stratum pressure, accurately control grouting parameters and realize the simulation of different field working conditions, and the dynamic load is applied to the foundation soil by the servo power loading device 25 to accurately simulate the mechanics and deformation response of the grouted foundation soil under the action of vertical dynamic load, thereby further disclosing the mechanism of the soft soil foundation shield tunnel post-construction settlement development.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (9)

1. The indoor grouting test device is characterized by comprising a grouting unit, a loading unit and a measuring unit, wherein the grouting unit comprises a grouting experiment barrel (11), a grouting pump (12), a grouting channel (13) and a grouting pipe (14), and the grouting pump (12) is communicated with the grouting pipe (14) through the grouting channel (13); the loading unit comprises a confining pressure loading mechanism and a servo power loading mechanism to simulate formation pressure, and the servo power loading mechanism is rigidly connected with the grouting pipe (14) to provide vertical load; the measuring unit can measure formation disturbance parameters caused by grouting.
2. The indoor grouting test device according to claim 1, wherein the confining pressure loading mechanism comprises an air bag (21) and an air pressure controller (22), the air bag (21) is sleeved in the inner wall of the grouting test barrel (11), and the air pressure controller (22) can adjust the internal air pressure of the air bag (21).
3. The indoor grouting test device according to claim 1, wherein the servo power loading mechanism comprises a top seat (23), a reaction frame (24), a servo power loading device (25) and an axial force meter (26), the top seat (23) is provided with a round hole for accommodating the grouting pipe (14), the lower end of the reaction frame (24) is connected with the grouting experiment barrel (11), the upper end of the reaction frame is connected with the servo power loading device (25), the top seat (23) is rigidly connected with the grouting pipe (14), and the servo power loading device (25) applies load to the grouting pipe (14) through the axial force meter (26).
4. Indoor grouting test device according to claim 1, characterised in that the grouting unit further comprises a flow meter (15) and a pressure gauge (16), the flow meter (15) and the pressure gauge (16) being provided on the grouting channel (13).
5. Indoor grouting test device according to claim 4, characterized in that the grouting pipe (14) is provided with a valve, and the wall of the grouting pipe (14) is provided with a plurality of grouting holes.
6. Indoor grouting test device according to claim 5, characterised in that the grouting pump is provided with an agitator (17) inside (12).
7. Indoor grouting test device according to claim 1, characterized in that the side wall of the grouting experiment barrel (11) is provided with a line reserved hole (18), and the lower part of the side wall of the grouting experiment barrel (11) is provided with a drainage hole (19).
8. The indoor grouting test device according to any one of claims 1 to 7, wherein the measuring unit comprises an earth pressure gauge (31), a hole pressure gauge (32), a piezoelectric bending element (33), a displacement sensor (34) and a data acquisition system (35), the displacement sensor (34) is arranged on the side wall of the grouting experiment barrel (11), a measuring head of the displacement sensor is connected with the top seat (23), and lines of the earth pressure gauge (31), the hole pressure gauge (32), the piezoelectric bending element (33) and the displacement sensor (34) are all connected with the data acquisition system (35).
9. A simulation grouting test method is characterized by comprising the following steps:
s01, manufacturing foundation soil, and putting a sensor into the foundation soil;
s02, applying vertical pressure and confining pressure to the foundation soil to simulate formation pressure;
s03, injecting the slurry into the foundation soil;
s04, applying vertical dynamic load to the foundation soil by using a servo motor;
and S05, acquiring the stratum disturbance parameters of the foundation soil when the foundation soil is subjected to vertical dynamic load through the sensor.
CN201911111263.9A 2019-11-14 2019-11-14 Indoor grouting test device and simulated grouting test method Pending CN111006951A (en)

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CN113791174A (en) * 2021-07-09 2021-12-14 上海市隧道工程轨道交通设计研究院 Tunnel bottom grouting jacking model test device and test method
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