TWI220681B - A simulation system and method of a grouting test body - Google Patents

Abstract

A simulation system and method of a grouting test body, mainly of how to simulate site grouting work via model grouting test and how to analyze and modify design parameters thereof to bring off a successful grouting, includes a grouting scoop, a sand releasing unit, a pressing box, a flow meter. Sand is released down to simulation scoops at regular intervals; a grouting shelf is placed on the simulation scoops able to process simulation tests of test body saturation, site stress state, water testing, and grouting testing; the water pressure meter set outside the grouting scoop and the flow meter provide relationship between grouting pressure and grouting flow. Procedures mentioned above construct a complete site grouting work via an indoor simulation of model grouting test to form a better mechanism and successful possibilities of grouting work.

Description

1220681

V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a grouting test body simulation system and method, especially to simulate on-site grouting operations through model grouting tests to analyze and modify related design parameters' to improve Grouting success simulation system. [Previous technology] At present, it is used for grouting in civil engineering such as earth-rock filling, deep excavation, sewers and MRT. The grouting points are located on the lower surface. The required on-site grouting equipment is shown in Figure 1, including a slurry mixer. And mixers, conveying slurry = pumps, pouring and polymerizing pipes, etc., because the volume of each body is quite large, and if the relevant grouting operation parameters are not designed and adjusted according to the local conditions, the grouting effect will be poor, so you must first Perform model grouting test in the laboratory 'to modify the relevant design parameters (such as grouting material, grout ratio, grouting volume and grouting pressure, grouting hole spacing, etc.) through the results of the model grouting test, so that the indoor test results can be returned to the site Grouting operation to achieve the purpose of improving the success of local grouting. a. The existing indoor simulation test methods can be divided into two types: groundwater flow and stationary, and the test scale is divided into small-scale and large-scale tests.

As an example, the deep-layer stress change and the static state simulation test are carried out. The small concrete mold test is performed as shown in Fig. 2. One of the piercing preparations is used to maintain the original state, and the other is grouting. The test is mainly used to judge the consolidation effect of grouting test with various grouts, but this test will not accurately reflect the relationship between grouting pressure and flow. Therefore, the test is not 1220681 V. Description of the invention (2) Applicable to It is used for the assessment of large-scale local conditions. The large-scale test, as shown in Figure 3, is mainly to set a filter material (gravel) on the bottom of the grouting sample simulation bucket, and then fill the filter material (sand or soil) taken from the site excavation on the filter material. The test body is inserted with a grouting tube. The simulation method is to saturate the test body through the water pipe on the side of the simulation barrel, and then a rubber layer is installed on the top of the simulation barrel to inflate and pressurize or provide soil pressure by tamping. The grouting tube squeezes out the pore water in the gap between the specimens after the grouting. This large-scale test has been able to simulate deep stress conditions through pressurized equipment, understand the slurry penetration during actual grouting, and excavate the grouted specimens after the test. To test the improvement range, shape, strength and permeability of grouting. However, when the grout is grouting in the face of different pores, due to the different pores, the distribution ratio and flow rate of the slurry must be included in the parameter design, but the simulation is familiar. The test could not measure the flow rate of the test object during grouting. At best, the total flow rate can only be obtained by collecting the pore water that was squeezed out during the grouting into the water tank. Therefore, the future on-site grouting operation Still can not design parameters of the relationship between grouting pressure and flow of grout, grout making mechanism still seems inadequate. [Summary of the invention] The main purpose of the present invention is to solve the above-mentioned shortcomings and avoid the missing ones. The present invention provides an indoor model grouting test simulation that fully presents on-site grouting operations, thereby establishing a better grouting mechanism to enable grouting. The simulation system and method for increasing the grouting sample with increased success. The main include: -filling polymer bucket,-sand reduction unit, history bucket, and a flow rate = using the sand reduction unit to drop sand to the simulation bucket at an equal distance. And the simulation barrel is placed κ, and then the sample is saturated through the pressure barrel, and the in-situ stress situation is simulated.

Page 6 1220681 V. Description of the invention (3), water test and grout flow relationship between grouting section and grouting section outside grouting bucket, analysis and correction [implementation] test and other simulation operations, manometer tube and flow calculation In order to achieve the relevant design parameters of model grouting and during the grouting operation, the grouting unit can know that the grouting pressure test simulates the local grouting for high grouting success. The detailed description and technical contents of the present invention are described below with reference to the drawings: Li Jian Refer to [shown in Figure 4], which is a schematic diagram of the simulation system configuration of the present invention, as shown in the figure: The present invention is a grouting test The body simulation system mainly improves the grouting success by simulating on-site grouting operations through model grouting tests to analyze and modify related design parameters. The simulation system includes: a grouting bucket 10, with a support body 1 and a grouting bucket丨 〇 An inner lining body 12 is formed in the side water storage area 101 and the lower water storage area 102, and a geotextile 13 is laid on the inner lining body 12 and an inner lining body 12 is provided with a Grouting frame 1 4 'The grouting tube 1 4 1 of the grouting frame 14 is located at the measurement depth of the simulated in-situ stress measurement, and an upper cover 15 is arranged on the grout barrel 10, and the upper cover 15 and A pressure applying unit is provided between the grouting buckets 10, and the pressure applying unit comprises an inflatable deformable elastic membrane body 1 51 and an air barrier element 1 5 2 which blocks the elastic membrane body 1 51, and is placed in the grouting barrel. There are a water inlet 16 and a water outlet 17 on 10, The bottom of the grouting bucket 10 can be provided with hydraulic gauge tubes 1 8 ′ of different heights, and the highest height of the hydraulic gauge tube 丨 8 is flush with the slurry outlet 1 4 2, and the top surface of the specimen has a The geotextile 13 wraps the drainage layer 19 formed by the dish stone, and a pressure bearing plate 20 is placed on the top of the drainage layer 19. A sand reduction unit including a test body receiving body 21 and a displaceable receiving body

1220681 V. Description of the invention (4) The body 2 1 to the grouting barrel 10 and the moving body 22 for the test body pouring, the specimen receiving body 2 1 has a sand-falling pipe extending into the grouting barrel 10 2 1 1, and the falling stone > official 2 1 1 is provided with a certain distance from the test body to the sand reduction height 2 2 element. (Please refer to Figure 5 for this component) & ^ Pressure bucket 'includes a water pressure bucket 3 which provides a water inlet 16 to saturate and raise the test body ^ ^ The pressure unit performs water pressure simulation on the test body 3 1 1. An air pressure barrel 3 providing a unit C for soil stress of the test body 3 2. and one or more liquid pressure barrels 33 and 34 containing the liquid f to the grout pipe 141. The calculation unit 40 of the flow 5 includes a first component 41 which is connected to the second pipeline by the first pipeline 4 0 2] 丄 0, and the first component 41 is equal to the grouting barrel 1 0 篦 1 and #. Simulate the water pressure on the spot to obtain a reference water level of 401, and connect the second part 42 of the first part 41 with the piece = 2 two way 103, and in the second part, the mouth end 4 2 1 and the outlet end 4 2 2 is connected with a measuring line 4 3 1 is provided with a differential pressure material; :: ^ 44 The differential pressure calculation unit 43 is connected with a signal line 441. The figure shown in FIG. 12 is the simulation method of the present invention. The flow chart is intended to be a simulation test step to understand the implementation of the present invention. It is necessary to note and geological makeup. Before the test is planned, the local engineering geological characteristic water test must be evaluated. * Ϊ: ΐ ϊ 表 surface test The physical properties of the body are tested and tested as follows: 9 saliva / cultural properties and applicability, the simulation steps are listed on the spot, ρθ provided a grout bucket 10: the simulation is defined in the grout bucket 10, and the depth The grouting bucket 10 must first have a cleaning program. The quality of the bucket 10 will affect the filling operation and the test body improvement.

Page 8 1220681 V. Description of the invention (5) Test injection β) Preparation of on-site test specimens: Since the present invention adopts the dry down-casting method to pour iI ^, the test specimens are first subjected to a drying process. . ,, ',' ,, = must be excluded first, the temperature and time of drying the soil sample depends on the type of soil operation / ensure that the sample soil sample is dried to the original m, at this time, complete the sample body drying,?, Start to enter During the pouring operation, the container 2 is placed into the container 2 through the test body. The moving body 22 carries the container 21 to the bottom of the grouting barrel u (see Figure 5). Because the container 2 has There is a certain distance from the element tube 211 extending to the height of the sand drop of the specimen ^ > Door element 2 1 2, the distance element 2 1 2 will ensure that the gravity of the specimen is stable during the injection. That is to say, in order to keep the pores of the specimen fixed, there will be no tightening and loosening, and washing will be performed with a spiral concentric trajectory, τ maintains the flat state of the specimen surface, and when the specimen drops sand When the measured depth is reached, the sand reduction operation is temporarily stopped. (C) Place the grouting frame 14 on the inner lining body 12 and place the grouting tube 141 of the grouting frame 14 at the grouting hole 142 at the measured depth (as shown in Figure 6). (D) Following the casting operation of the test body, and after the test body is poured, record the total washing time, the total washing volume of the test body and calculate the porosity ratio of the test body. The so-called washing injection is completed to the top of the inner lining 12 At the same height, it is necessary to pay attention to the "work # when reaching the height of 1" to avoid the second consideration will be replaced with a short sand reduction tube 211 to continue: (E) Perform sample saturation operations, such as 箆 R bucket 3 1 by the grout from The water inlet of the bucket 10, 6 slowly ^: No, the pore air is discharged through the water pressure, and the filling and filling buckets are filled with water 11 1220681 between the record and the day of cooking. V. Water injection should be continued after the description of the invention (6) Allow the water to overflow the test subject for a period of time (about 12 hours), and then stop the saturation operation. (F) Fabricate a drainage layer 19 on the top surface of the test body. The drainage layer 19 is also formed of a geotextile 13 wrapped with gravel, and a pressure bearing plate 20 is placed on the top of the drainage layer 9. (As shown in Figure 9).

(G) Cover the grouting bucket 10, cover 15 and inject the air pressure through the gas pressure bucket 3 2 to make the elastic membrane 1 5 of the pressure applying unit deform the pressure-receiving pressure plate 2 〇 In-situ soil stress simulation of the test body ( (As shown in Figure 丨 〇), and the pressure through the water pressure bucket 31 to make the pressure unit to perform on-site water pressure simulation of the test body, before carrying out, must consider the soil pressure above the slurry outlet 142, and the hydrostatic pressure ( H) The type and ratio of the slurry used to make the test specimen grouting according to the local conditions must be determined in accordance with the rules. The materials are: suspended type and = type: depending on the situation. 'Irrigation commonly used (I) Perform the grouting test of the sample. The barrel ^ ^ ^ ^ ^ (depending on the type of slurry = = =: The grouting officer 141's grouting outlet 142 starts grouting, and the second output is Έ, which can be set through the bottom of the grouting barrel 10.仃 f ^ 5 type test No. 1. Also make the water pressure gauge 瞢 18 of different heights and the maximum height of the water pressure gauge tube 18 and the slurry outlet 142 win

The tube 18 cooperates with the water pressure in the grouting section of the grouting barrel 10 and the hydrometer before the grouting test. The hydrostatic pressure of the test body is 4 I. For this, it can be performed in the excess = percolation method. The flow calculation unit gap ^ causes ^, the liquid displacement will pass through the first part 41 of the first-70 70, and the same super

Page 10 1220681 V. Description of the invention (7) The pore water passing through the reference water level 401, as shown in Fig. 11, flows from the second pipeline 4 〇3 to the second component 4 2 and passes through the differential pressure calculation unit. 4 3 Calculate the differential pressure between the original equivalent in situ simulated water pressure (inlet end 42 1) and the original equivalent in situ simulated water pressure plus the pore water pressure (outlet end 42 2). Because the differential pressure calculation unit 4 3 measures The obtained value is the voltage value, which is substituted into the pressure-voltage curve of the differential pressure gauge calibration program. The actual water pressure difference value at each time interval can be obtained, and then the data acquisition device 44 synthesizes the water pressure difference value, When grouting = 1 grouting pressure, and calculate the grouting flow and overall flow, so as to study the relationship between grouting pressure and flow. (J) Consolidation of the test body; ^ can, Sun face-XJb «Jk

The keeping side system kept the martial arts body in a consolidated state. (K) Excavate the test specimen, and move it from the test specimen to the distribution of the slurry. Samples will be taken and analyzed under the condition of τ-shaped complaints. The test specimens will be mixed with the slurry. parameter. It can design and modify the phase release, and display 0 back. The present invention will successively learn the simulated number of places during various stresses, change the grouting pressure, and grouting materials, and the monitoring during the grouting ^ cry 1, grouting amount And test pores and other parameters (43), in cooperation with the test body opening, manometer tube 18 and differential pressure calculation sheet planning, design, construction to inspection core process J 4, can be set up for grouting operation site construction, In order to improve the construction quality, the order can be made, and the results can be returned to the above, which is only for the sake of strength. This is only a preferred embodiment of the scope of the present invention. When equal changes and modifications are not made within the scope, it is within the scope of patent application according to the present invention. Bai Ying is still covered by the invention patent

1220681 Brief description of the drawings [Simplified description of the drawings] Fig. 1 is a schematic diagram of a local grouting equipment Fig. 2 is a schematic diagram of a small-scale test equipment Fig. 3 is a schematic diagram of a large-scale test equipment Fig. 4 is a simulation of the present invention Schematic diagram of system configuration Figure 5, is a schematic diagram of the pouring operation of the present invention Figure 6, is a schematic diagram of the grouting rack installation of the present invention Figure 7, is a schematic diagram of the continuous pouring operation of the present invention Figure 8, is the completion of the pouring operation of the present invention Figure 9 is a schematic diagram of the saturation test of the present invention. Figure 10 is a schematic diagram of the soil stress test of the present invention. Figure 11 is a schematic diagram of the flow system flow direction of the present invention. Figure 12 is a simulation method flow of the present invention. Figure [Symbol description of the figure] Grouting bucket ........ · · · 10 Supporting body ..... —— 11 Lining body .... · · · 12 side water storage area · · · · · · 101 lower water storage area · · · · 102 geotextile · · · · · 13 grouting rack ........ · · 14 grouting pipe ..... · · 141 grouting port ... · 142 Upper cover ...... —— 15 Membrane body ..... Components · · · · · · 152 Grouting section ......... —— 153 Gas filling section ......... · 154 Water inlet section ... · 17 Hydrometer tube · · · · · · · 18 Drainage layer ..... —— 19 Receiving body ........ · 21 Moving body ...

1220681 on page 12 Brief description of the sand reducing pipe ......... 211 pitch unit ... 212 Water pressure bucket • • • 31 Pneumatic pressure 甬-• • 32 Slurry pressure bucket • · · • 33 &34; 34 flow calculation unit · · · · 4 0 first part · · · 41 reference level-· · · · 401 first line · · · · 402 second line · · · · · · 403 Second component reference • · 42 input π end · · · 421 outlet end · · · 422 measurement line · · · 431 differential pressure calculation unit · · · · · 43 signal line · · · 441 data acquisition device · · • 44 pressure plate • 20

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Claims (1)

1220681 6. Scope of patent application 1. A method for simulating grouting samples, which simulates local grouting operations through model grouting tests to analyze and modify related design parameters to improve the success of grouting. The simulation steps are: (A) Grouting barrel, the measurement depth that simulates in-situ stress measurement is defined in the grouting barrel; (B) prepare the on-site test body, and perform the casting operation to reduce the test body to the measurement depth; (C) place the grouting rack and make The grouting tube outlet of the grouting rack is located at the measurement depth; (D) Continue the test body pouring operation, and record the total washing time, the total test body pouring amount and calculate the test body porosity after the test body pouring is completed; (E) Perform sample saturation operation to saturate the sample and exhaust the pore air, and record the saturation operation time; (F) Make a drainage layer on the top surface of the sample, and place a pressure plate on top of the drainage layer; (G) Cover the grouting bucket On the cover, the on-site soil stress simulation is performed by the pressure unit on the upper cover, and the on-site water pressure simulation is performed by the pressure unit on the water pressure barrel; (H) According to the on-site condition, the sample is used for grouting. (I) Carry out test body grouting test, grout the slurry of item (1) from the grouting port of the grouting tube, perform water test before the test, and let the pore water of the test body squeeze out through the slurry. To the flow calculation unit, after recording and calculation, analyze and discuss the relationship between grouting pressure and flow; (J) Consolidation and maintenance of the test body, Page 14 1220681 VI. Scope of patent application (K) Excavation of the test body, and sampling and analysis under the state of consolidation of the test body, and-analysis and correction of related parameters. 2. The method for simulating grouting specimens as described in item 1 of the scope of patent application, wherein the pouring operation of the specimens is performed by the dry down method. 3. The method for simulating grouting specimens as described in item 1 of the scope of patent application, wherein the slurry is a permeation grouting method. 4. The grouting test body simulation method described in item 1 of the scope of the patent application, wherein the bottom of the grouting barrel can be provided with water pressure gauge tubes of different heights, and the maximum height of the water pressure gauge tube is flush with the slurry outlet, Before the grouting test, the test of the test body under the condition of hydrostatic pressure can be performed. 5. A kind of grouting test body simulation system, which simulates local grouting operation through model grouting test, in order to analyze and modify related design parameters to improve the success of grouting. The simulation system includes: a grouting bucket, which is erected with a support body. An inner lining body forming a side water storage area and a lower water storage area with the grouting barrel, a geotextile is laid on the inner lining body, and a grouting frame is arranged on the inner lining body, and the grouting pipe outlet of the grouting frame It is located at the measurement depth of the simulated in-situ stress measurement, and an upper cover is arranged on the grout barrel. A pressure applying unit is arranged between the upper cover and the grout barrel, and a water inlet and a water outlet are provided on the grout barrel. A sand reduction unit , Including a test body containing body and a displaceable containing body # to the grouting barrel and moving body for pouring the sample; the pressure barrel contains a water inlet part to saturate the test body and a pressure unit for testing A water pressure bucket for water pressure simulation of the body, a gas pressure bucket for providing a pressure unit to cover the test body with soil stress, and more than one slurry Page 15 1220681 VI. Patent pressure range: slurry pressure bucket delivered to the grouting pipe; a flow rate calculation unit including a first component connected to the water outlet of the grouting barrel via a first pipeline; the first component is equal to the inside of the grouting barrel On-site simulation of water pressure to obtain a reference water level, and the second component is connected to the second component of the first component through a second pipeline, and a differential pressure calculation unit is provided at the inlet end and the outlet end of the second component through a measurement line, the differential pressure The computing unit is connected to a data acquisition device by a signal line. 6. The grouting test body simulation system as described in item 5 of the scope of the patent application, wherein the bottom of the grouting barrel can be provided with water gauge tubes of different heights, and the maximum height of the water pressure gauge tube is flush with the slurry outlet. 7. The grouting test body simulation system according to item 5 of the scope of the patent application, wherein the pressure applying unit includes an elastic membrane body deformed by inflation of an air pressure barrel and an air resistance element for blocking the periphery of the elastic membrane body. 8 · The grout test sample simulation system as described in item 5 of the scope of the patent application, wherein the test sample housing system has a sand reduction tube extending into the grout barrel, and a certain distance test sample is arranged on the sand reduction tube Distance between the height of the sand drop element. 9. The grouting sample simulation system as described in item 5 of the scope of the patent application, wherein the top surface of the sample has a drainage layer formed by a geotextile wrapped gravel, and a pressure plate is placed on the top of the drainage layer. . Page 16