CN114165244B - Shield synchronous double-liquid grouting process field verification test method - Google Patents
Shield synchronous double-liquid grouting process field verification test method Download PDFInfo
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- CN114165244B CN114165244B CN202111441522.1A CN202111441522A CN114165244B CN 114165244 B CN114165244 B CN 114165244B CN 202111441522 A CN202111441522 A CN 202111441522A CN 114165244 B CN114165244 B CN 114165244B
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- 239000007788 liquid Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 59
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 30
- 238000012795 verification Methods 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 20
- 238000004088 simulation Methods 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002689 soil Substances 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 8
- 230000005641 tunneling Effects 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 4
- 238000011160 research Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000011259 mixed solution Substances 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 238000007569 slipcasting Methods 0.000 description 12
- 239000012530 fluid Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000989913 Gunnera petaloidea Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012502 risk assessment Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000004382 visual function Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
- E21D9/0609—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering with means for applying a continuous liner, e.g. sheets of plastics, between the main concrete lining and the rock
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Engineering & Computer Science (AREA)
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- Geology (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Architecture (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Civil Engineering (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a shield synchronous double-liquid grouting process field verification test method, which adopts test equipment comprising a pipeline simulation device for simulating a pipeline in a shield tail shell, and an environment simulation device for simulating an outlet environment of a grouting pipeline and provided with a filling bin and a grouting bin, wherein the filling bin and the grouting bin are communicated, and the environment simulation device has the functions of shield tail movement, soil layer simulation, water and soil pressure simulation, automatic pressure maintaining, outlet pressure monitoring and the like, and comprises the following steps: s1, assembling equipment; s2, pressurizing the filler; s3, stirring the mixed solution of A, B; s4, simulating grouting; and S5, analyzing results and optimizing and verifying. On one hand, the invention accurately obtains the grouting effect under different parameters, and determines the optimal grouting process through repeated verification; on the other hand, a set of scientific and feasible test method is formed, has higher reproducibility and is beneficial to realizing the standardization of the shield synchronous double-liquid grouting process in China.
Description
Technical Field
The invention belongs to the technical field of grouting, and particularly relates to a shield synchronous double-liquid grouting process field verification test method.
Background
In the shield tunneling process, the outer diameter of a cutter head of a shield is larger than the outer diameter of a lining segment, and a shield shell has certain thickness, in addition, the phenomena of overexcavation and the like exist in the tunneling process, after a shield tail is separated from the segment, an annular gap can appear between the segment and a stratum, and the shield tail gap is usually filled by adopting a synchronous grouting technology in the actual shield tunnel engineering.
Currently, the commonly used grouting slurry in shield tunnel construction can be roughly divided into two types, namely a single-fluid grouting material and a double-fluid grouting material. The double-fluid slurry is prepared by pumping A, B fluid from two pipelines, mixing in the slurry injection hole of the shield tail and injecting into the gap of the shield tail. The liquid A is cement-based material, and the liquid B is usually water glass material as a hardening agent. In the actual shield tunnel engineering, the proportion of the double slurry is properly adjusted, so that the stone body has higher early strength, the shield tail is effectively filled, and the ground surface settlement is controlled. Therefore, the double-fluid slurry is commonly applied to the water-rich environment of tunnel shield construction, the synchronous grouting of a soft soil layer and the secondary grouting of conventional shield construction, takes the typical donLiuhua (Beijing hao high speed-Luyuan north street) reconstruction engineering large shield tunnel in China as an example, and is characterized in that: 1. the length is equal to 7341m, the longest distance of one-time continuous tunneling reaches 4770m, and the tunnel is a highway tunnel with the longest single-time shield tunneling mileage in the urban environment in China; 2. the design section diameter of the tunnel is 15.4m, the excavation diameter of a slurry balance shield is 16.07m, the thickness of a segment is 65cm, and the tunnel is the largest in the field of urban highway shield tunnels in China; 3. the tunnel penetrates through a high-density water-rich sand layer and a silty clay interbedded stratum with the maximum buried depth of 75m and the underground water pressure of about 6.5bar; 4. the engineering is positioned in a core zone of a secondary center, numerous roads, railways, subways, rivers and underground pipelines are penetrated, risk sources above the level III of the risk assessment are designed to be 115, and a special level risk source 6 is designed; 5. the method has the advantages that the method is high in political requirement, is located in the core zone of the subsidiary center of the Beijing city, integrates political, social and economic functions, and bears powerful regional functions and civil welfare sites. Therefore, the double-slurry synchronous grouting technology is innovatively applied, and the method has a great leading effect on promoting the development of the large-diameter shield to be longer, deeper and more excellent.
Therefore, the applicant modifies the geological conditions and the actual engineering conditions of the engineering shield tunnel section by combining the above-mentioned donghua (Beijing haha high speed-Luyuan north street), adaptively performs the model selection design of the synchronous double-liquid grouting system of the shield machine, and researches and determines the detailed grouting process.
However, in the actual construction process, because the conventional synchronous grouting process adopts single-fluid slurry, double-fluid slurry is rarely adopted, and especially the large-diameter shield synchronous grouting double-fluid synchronous grouting process is still blank, a scientific and reasonable field verification test method needs to be made in order to fully verify the feasibility of the grouting process design.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a brand-new on-site verification test method for the shield synchronous double-liquid grouting process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a shield constructs the on-the-spot verification test method of the synchronous biliquid slip casting process, the test equipment that it adopts carries on the in situ test with the aid of the slip casting apparatus that the slip casting process adopts, and the test equipment includes the pipeline analogue means of the inner pipe line of the simulation shield tail shell, the simulation slip casting pipeline exports the environment and has environment analogue means of stuff storehouse and slip casting storehouse, wherein stuff storehouse and slip casting storehouse are linked together and set up, and the environment analogue means has functions such as shield tail movement, soil layer simulation, water and soil pressure simulation, automatic pressure maintaining, outlet pressure monitoring, etc., the test method includes the following steps:
s1, equipment assembly
Assembling a liquid A supply pipeline, a liquid B supply pipeline, a grouting pipeline positioned outside a shield tail shell, a pipeline simulation device and an environment simulation device;
s2, pressurizing the filler
Filling an original soil body prepared in advance into a filling bin according to a stratum environment to be simulated, injecting water above the soil layer, pressurizing to a design pressure, and maintaining the pressure for a certain time;
s3, mixing the A, B liquid
Mixing a proper amount of mixed liquid of the liquid A and the liquid B according to the designed mixing proportion, and sampling and reserving samples for the mixed liquid;
s4, simulating grouting
According to the designed grouting process flow, synchronously operating the environment simulation device and the grouting control system to enable the grouting pipeline to simulate shield tunneling and synchronous grouting in the grouting bin, and observing and recording various test data in the test process;
s5, analyzing results and optimizing verification
And (4) carrying out research and analysis according to the test data of S4, providing an optimization scheme of the grouting process and the A, B liquid mixing ratio, then repeating S2-S4, circularly verifying and optimizing, and finally determining the optimal grouting process and the optimal slurry mixing ratio.
Preferably, in S1, the grouting control system is used to perform no-load debugging on the assembled test equipment, check whether the control system corresponds to each control component, and observe whether the grouting pump, the valve bank, the piston and the like are operating normally. By the arrangement, the normal operation of each connecting part is ensured, and the precision and the reliability of the test result are improved.
Preferably, in S1, the assembled test equipment is load debugged with clean water, and the sealing performance of the joints and the functionality of each sensor are checked; calibrating and correcting the flowmeter and the pressure gauge; verifying the functions of grouting start-stop, flushing and the like; the control of the mixing ratio of A, B liquid is preliminarily debugged. By the arrangement, each control component can be ensured to operate normally, and the test process can be ensured to be debugged smoothly without errors.
Specifically, the flow ratio of A, B liquid is controlled to adjust the mixing ratio of A, B liquid.
Preferably, in S2, after the filler bin is pressurized to the design pressure, the pressure is maintained for 24h to 72h. The arrangement is such that the environment of the filler bin is closer to the actual formation environment.
Specifically, in S2, the soil is filled to the 1/2 height of the filling bin, water is injected to the 3/4 height of the filling bin, and a pressurizing area communicated with high-pressure gas is formed between the water surface and the top of the filling bin so as to simulate the stratum environment of water and soil pressure.
Preferably, the side walls of the filling bin and the grouting bin are made of transparent glass. Set up like this, it is visual that filler storehouse can realize, makes things convenient for the tester to pack and observe.
Furthermore, a sampling port for sampling in the grouting process is also arranged on the grouting bin. Set up like this, realize environment simulation device's process sampling function, the testing personnel of being convenient for take a sample and look over the slip casting effect at the slip casting in-process.
Preferably, the ratio of the pipeline simulation device to the size of the pipeline in the shield tail shell is 0.5 to 1. Set up like this, the simulation actual slip casting environment increases the reliability of test result.
In addition, the ratio of the space of the grouting bin to the coverage space of actual single-hole grouting is 0.5-1.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
on one hand, the invention can accurately acquire grouting effects under different parameters by simulating the actual working condition of shield synchronous double-liquid grouting, and determines the optimal grouting process through repeated verification; on the other hand, a set of scientific and feasible test method is formed, has higher reproducibility and is beneficial to realizing the standardization of the shield synchronous double-liquid grouting process in China.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, specific embodiments thereof are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
In the field verification test method for the shield synchronous double-liquid grouting process, the adopted test equipment performs in-situ test by means of grouting equipment adopted by the grouting process.
Specifically, the test equipment comprises a pipeline simulation device for simulating a pipeline in the shield tail shell and an environment simulation device for simulating the environment of the outlet of the grouting pipeline.
According to the design drawing of the shield tunneling machine, the pipeline simulation device is identical to the pipeline in the shield tail shell in specification and function, and can move freely, so that the pipeline simulation device can be freely assembled according to different simulated grouting environments.
That is, the ratio of the size of the pipeline simulator to the size of the pipeline in the shield tail shell is 1:1. Set up like this, the simulation actual slip casting environment increases the reliability of test result.
In this example, the environment simulation apparatus has basic simulation functions such as shield tail movement, soil layer simulation, water and soil pressure simulation, automatic pressure maintaining, outlet pressure monitoring, and the like.
The environment simulation device comprises a filling bin for simulating a formation environment, a grouting bin arranged at the bottom of the filling bin, a telescopic component sealed and movably arranged in the grouting bin, and an automatic pressure maintaining component for pressurizing and maintaining the pressure of an inner cavity of the filling bin, wherein the filling bin is communicated with the grouting bin; the telescopic part simulates the shield tail to be pushed in the grouting bin, and a grouting pipeline positioned outside the shield tail shell is arranged in the telescopic part to simulate synchronous grouting.
For convenience of implementation, the filling bin and the grouting bin are of a steel framework and a transparent glass structure embedded on the steel framework. The visual function is realized, and the filler and the observation of a tester are facilitated.
Meanwhile, the grouting bin is also provided with a sampling port for sampling in the grouting process. Set up like this, realize environment simulation device's process sampling function, the testing personnel of being convenient for take a sample and look over the slip casting effect at the slip casting in-process.
And under the condition that the conditions allow, the ratio of the space of the grouting bin to the coverage space of the actual single-hole grouting is 1:1.
The test method of this example includes the following steps:
1. assembling a liquid A supply pipeline, a liquid B supply pipeline, an in-situ grouting pipeline positioned outside a shield tail shell, a pipeline simulation device and an environment simulation device, wherein the positions of the pipeline simulation device and the in-situ grouting pipeline are changed according to actual conditions so as to ensure that the total length of the grouting pipeline is kept unchanged;
2. firstly, carrying out no-load debugging on assembled test equipment by using a grouting control system, checking whether each operation area of the control system corresponds to each control component, and simultaneously observing whether a grouting pump, a valve bank, a piston and the like normally operate;
secondly, carrying out load debugging on the assembled test equipment, namely injecting clear water into a grouting pipeline and checking whether the connection tightness of the test equipment meets the requirement; checking whether each sensor works normally or not, and calibrating and correcting the flow meter and the pressure gauge; the control system is used for respectively operating the processes of starting and stopping grouting, flushing a grouting pipeline and the like so as to verify the feasibility of each process; preliminarily debugging double-liquid mixing ratio control by a control system, wherein the control system controls the mixing ratio of A, B liquid by adjusting the flow ratio of A, B liquid;
3. according to the stratum environment to be simulated, filling a prepared undisturbed soil body to the position of 1/2 of the height of the filling bin in a layering manner, injecting water to the position of 3/4 of the height of the filling bin, forming a pressurizing area between the water surface and the top of the filling bin, and automatically inputting high-pressure gas into the pressurizing area by the automatic pressure maintaining part so as to simulate the stratum environment of water and soil pressure; meanwhile, after the actual pressure in the filler bin reaches the design pressure, the automatic pressure maintaining component stops outputting high-pressure gas and maintains the pressure of the filler bin for 24h to 72h;
4. mixing a proper amount of mixed liquid of the liquid slurry A and the liquid slurry B according to the designed mixing proportion, and sampling and reserving a sample for the mixed liquid;
5. according to the designed grouting process flow, synchronously operating the environment simulation device and the grouting control system to enable the telescopic component to be pushed in the grouting bin, and synchronously grouting the mixed liquid prepared in the step 4 by using a grouting pipeline arranged in the telescopic component, wherein the flow and the pressure of A, B liquid are strictly kept to be matched with the pushing speed of the telescopic component, and the grouting effect is observed through the side wall of the grouting bin; meanwhile, checking the running condition of the test equipment, checking the accuracy of the sensor, recording data of each link of the grouting process and each index effect value of the double-liquid grout in detail, and reserving image data in the whole process;
6. research and analysis are carried out according to the test data in the step 5, the mixing ratio parameter of A, B liquid is adjusted, then the step 3~5 is repeated to verify the actual application effect (including outlet state, diffusion rule, filling effect, water dispersibility resistance, gel time, initial setting time and the like) of the mixed liquid of A, B liquid under different mixing ratios, the mixed liquid is compared and analyzed with indoor test indexes, an optimization scheme of a grouting process and A, B liquid mixing ratio is provided, and finally the optimal grouting process and slurry mixing ratio are determined and established through circulation verification and optimization.
In summary, the present embodiment has the following advantages:
1. by simulating the actual working condition of shield synchronous double-liquid grouting, the grouting effect under different parameters can be accurately obtained, and the optimal grouting process is determined through repeated verification;
2. a set of scientific and feasible test method is formed, has higher reproducibility and is beneficial to realizing the standardization of the shield synchronous double-liquid grouting process in China;
3. the adopted test equipment has simple structure and low manufacturing cost, and is convenient to install and implement.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (7)
1. A shield synchronous double-liquid grouting process field verification test method is characterized by comprising the following steps: the test equipment carries out in-situ test by means of grouting equipment adopted by a grouting process, the test equipment comprises a pipeline simulation device for simulating a pipeline in a shield tail shell, an environment simulation device for simulating an outlet environment of a grouting pipeline and having a filling bin and a grouting bin, wherein the filling bin is communicated with the grouting bin, the environment simulation device has the functions of shield tail movement, soil layer simulation, water and soil pressure simulation, automatic pressure maintaining and outlet pressure monitoring, the environment simulation device comprises a filling bin for simulating a stratum environment, a grouting bin arranged at the bottom of the filling bin, a telescopic component sealed and movably arranged in the grouting bin and an automatic shield component for pressurizing and maintaining an inner cavity of the filling bin, the telescopic component simulates a tail to push in the grouting bin, the grouting pipeline positioned outside the shield tail shell is internally arranged in the telescopic component to simulate synchronous grouting, the proportion of the pipeline simulation device to the size of the pipeline in the shield tail shell is 0.5 to 1, and the proportion of the space of the grouting bin to the coverage space of an actual single hole is 0.5 to 1, and the grouting method comprises the following steps:
s1, equipment assembly
Assembling the liquid A supply pipeline, the liquid B supply pipeline, the grouting pipeline positioned outside the shield tail shell, the pipeline simulation device and the environment simulation device, wherein the positions of the pipeline simulation device and the in-situ grouting pipeline are changed according to actual conditions so as to ensure that the total length of the grouting pipeline is kept unchanged;
s2, pressurizing the filler
Filling an original soil body prepared in advance into the filling bin according to a stratum environment to be simulated, injecting water to a position above a soil layer, pressurizing to a design pressure, and maintaining the pressure for 24h to 72h;
s3, mixing the A, B liquid
Mixing a proper amount of mixed liquid of the liquid A and the liquid B according to the designed mixing proportion, and sampling and reserving samples for the mixed liquid;
s4, simulating grouting
According to the designed grouting process flow, synchronously operating the environment simulation device and the grouting control system to enable the telescopic component to be pushed in the grouting bin, and synchronously grouting mixed liquid mixed in the S3 by a grouting pipeline arranged in the telescopic component, wherein the flow and the pressure of A, B liquid are kept to be matched with the pushing speed of the telescopic component, and the grouting effect is observed through the side wall of the grouting bin; meanwhile, checking the operation condition of the test equipment, checking the accuracy of the sensor, enabling the grouting pipeline to simulate shield tunneling and synchronous grouting in the grouting bin, observing and recording various test data in the test process, recording the data of each link of the grouting process and various index effect values of the double-liquid slurry in detail, and keeping image data in the whole process;
s5, analyzing results and optimizing verification
And (4) carrying out research and analysis according to the test data of S4, providing an optimization scheme of the grouting process and the A, B liquid mixing ratio, then repeating S2-S4, circularly verifying and optimizing, and finally determining the grouting process and the slurry mixing ratio.
2. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 1, characterized in that: in S1, the grouting control system is used for carrying out no-load debugging on the assembled test equipment, whether the control system corresponds to each control component or not is checked, and whether the grouting pump, the valve group and the piston operate normally or not is observed.
3. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 1 or 2, characterized in that: in S1, carrying out load debugging on the assembled test equipment by using clear water, and checking the sealing property of a connection part and the functionality of each sensor; calibrating and correcting the flowmeter and the pressure gauge; verifying the grouting start-stop and flushing functions; the mixing ratio of A, B liquid is preliminarily adjusted and controlled.
4. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 3, characterized in that: the flow ratio of A, B liquid is controlled to adjust the mixing ratio of A, B liquid.
5. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 1, characterized in that: in S2, soil is filled to 1/2 of the height of the filling bin, water is injected to 3/4 of the height of the filling bin, and a pressurizing area communicated with high-pressure gas is formed between the water surface and the top of the filling bin so as to simulate the stratum environment of water-soil pressure.
6. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 1, characterized in that: the side walls of the filling bin and the grouting bin are made of transparent glass.
7. The on-site verification test method for the shield synchronous double-liquid grouting process according to claim 6, characterized in that: and the grouting bin is also provided with a sampling port for sampling in the grouting process.
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| KR100877580B1 (en) * | 2008-01-03 | 2009-01-07 | 주식회사 동아지질 | Eexperiment of grout stability for shield method |
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