Field test method for simulating influence of sleeve valve pipe grouting on surrounding environment

Abstract

The invention relates to a field test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment, which comprises the following steps of: 1, forming 16 grouting holes in the field, and arranging the grouting holes into a grouting hole array of 4 rows * 4 columns; 2, forming pore water pressure observation holes in the field, and arranging pore water pressure gauges in the pore water pressure observation holes; 3, five soil pressure observation holes are formed in the field, and a soil pressure meter is arranged in each soil pressure observation hole; 4, six sampling holes are formed in the site; and 5, sleeve valve pipe grouting is conducted line by line through the grouting holes, the pore water pressure is observed through the pore water pressure meter, the soil pressure is observed through the soil pressure meter, and sampling is conducted through the sampling holes. The influence of different grouting pressures on the surrounding environment can be comprehensively evaluated, the influence of sleeve valve pipe grouting on the type of foundation soil is truly reflected, the test operation is convenient, and the test result is visual and reliable.

Description

Technical Field

[0001] The present invention relates to the field of municipal engineering construction, and particularly designs a field test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment. Background Technique

[0002] Sleeve valve pipe grouting is a good foundation treatment technology and is widely used in the grouting of gravel and cohesive soil in civil buildings, industrial buildings, port and waterway engineering, water conservancy and hydropower engineering, rail transit engineering, and power engineering. Sleeve valve pipe grouting is a method of using unidirectional grouting to inject slurry into the soil layer under a certain pressure, and has the effects of compaction and splitting during the grouting process.

[0003] Due to the discreteness of the soil, the grouting effect needs to be determined through a large number of field tests. Existing test schemes mostly focus on the grouting effect, such as the range of slurry diffusion and the strength of the soil after reinforcement, etc., while the influence of the grouting process on the surrounding environment is not specified in detail. There are two disadvantages in the existing technical schemes: (1) Existing test requirements and theoretical calculation results mostly focus on the effect of grouting itself, that is, the grouting pressure, the range of slurry diffusion, the strength of the soil after slurry reinforcement, etc. When there are projects sensitive to deformation or with high requirements for additional pressure around the sleeve valve pipe grouting, it is impossible to analyze the magnitude of the additional pressure and deformation generated by grouting. (2) To solve the influence of grouting on the surrounding environment, existing schemes are all based on indoor tests. The soil samples used in indoor tests are remolded soils collected from the site. The soil particles are the same, but there are large deviations in the soil density. And what determines the grouting effect is mostly the voids and pipe connectivity of the soil. Indoor model tests cannot truly reflect the on-site grouting effect. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a field test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment, so as to comprehensively evaluate the influence of different grouting pressures on the surrounding environment, truly reflect the influence of sleeve valve pipe grouting on this type of foundation soil, and the test operation is convenient, and the test results are intuitive and reliable.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A field test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment, comprising the following steps: Step 1: Open 16 grouting holes on site. The grouting holes are arranged in a 4-row × 4-column grouting hole array. The numbers of the grouting holes in the first column to the fourth column of the first row are 1 to 4 respectively, the numbers of the grouting holes in the first column to the fourth column of the second row are 5 to 8 respectively, the numbers of the grouting holes in the first column to the fourth column of the third row are 9 to 12 respectively, and the numbers of the grouting holes in the first column to the fourth column of the fourth row are 13 to 16 respectively; Step 2: Open piezometric observation holes on site. The piezometric observation holes are located at the center of the grouting hole array, and piezometers are arranged in the piezometric observation holes. Step 3: Open 5 earth pressure observation holes on site. The first earth pressure observation hole and the second earth pressure observation hole are respectively located on both sides of the row direction of the grouting holes in the second row. The third earth pressure observation hole is located outside the column direction of the grouting hole numbered 1. The fourth earth pressure observation hole is located outside the column direction of the grouting hole numbered 4. The fifth earth pressure observation hole is located at the intersection of the four grouting holes numbered 2, 3, 6, and 7. Earth pressure gauges are arranged in each of the earth pressure observation holes. Step 4: Open 6 sampling holes on site. The first sampling hole is located at the column center of the grouting holes in the first column. The second sampling hole is located at the column center of the grouting holes in the fourth column. The third sampling hole is located at the intersection of the four grouting holes numbered 9, 10, 13, and 14. The fourth sampling hole is located at the intersection of the four grouting holes numbered 11, 12, 15, and 16. The fifth sampling hole is located outside the column direction of the grouting hole numbered 13. The sixth sampling hole is located outside the column direction of the grouting hole numbered 16. Step 5: Use the grouting holes in each row to conduct sleeve valve pipe grouting one by one. Observe the pore water pressure using the piezometer, observe the earth pressure using the earth pressure gauge, and take samples using the sampling holes.

[0006] The depth of the piezometric observation hole is greater than the depth of the grouting hole.

[0007] The depth of the earth pressure observation hole is greater than the depth of the grouting hole.

[0008] The depth of the piezometric observation hole is equal to the depth of the earth pressure observation hole.

[0009] The in-plane row spacing and in-plane column spacing of the grouting hole array are both s.

[0010] The center distance between the first earth pressure observation hole and the grouting hole numbered 5 is 0.75s. The center distance between the second earth pressure observation hole and the grouting hole numbered 8 is 0.75s. The center distance between the third earth pressure observation hole and the grouting hole numbered 1 is 0.5s. The center distance between the fourth earth pressure observation hole and the grouting hole numbered 4 is 0.5s.

[0011] The center distance between the fifth sampling hole and the grouting hole numbered 13 is 0.5s. The center distance between the sixth sampling hole and the grouting hole numbered 16 is 0.5s.

[0012] The piezometer in the first soil pressure observation hole faces the grouting hole numbered 5, the piezometer in the second soil pressure observation hole faces the grouting hole numbered 8, the piezometer in the third soil pressure observation hole faces the grouting hole numbered 1, the piezometer in the fourth soil pressure observation hole faces the grouting hole numbered 4, and the piezometer in the fifth soil pressure observation hole faces three adjacent grouting holes.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention can comprehensively evaluate the influence of different grouting pressures on the surrounding environment, truly reflect the influence of the sleeve valve pipe grouting on this type of foundation soil, the test operation is convenient, and the test results are intuitive and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a plan layout diagram of the on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment.

[0015] Attached Figure 2 It is a sectional view of the on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment.

[0016] Attached Figure 3 It is a schematic diagram of the sleeve valve pipe grouting layout. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described below in conjunction with the embodiments shown in the drawings.

[0018] Embodiment 1: As shown in Attached Figure 1 to Attached Figure 3 A on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment includes the following steps: Prepare drilling equipment, sleeve valve pipe grouting equipment and several sleeve valves for grouting before the test. These facilities are the same as those actually used in the project, and no additional test equipment is required.

[0019] Step 1: Open 16 grouting holes 1 on site. Horizontally, the grouting holes are arranged in a square grouting hole array of 4 rows × 4 columns. In the first row, the numbers of the grouting holes from the first column to the fourth column are 1 to 4 respectively, that is, the grouting hole 15 numbered 1, the grouting hole 16 numbered 2, the grouting hole 17 numbered 3, and the grouting hole 18 numbered 4; in the second row, the numbers of the grouting holes from the first column to the fourth column are 5 to 8 respectively, that is, the grouting hole 11 numbered 5, the grouting hole 12 numbered 6, the grouting hole 13 numbered 7, and the grouting hole 14 numbered 8; in the third row, the numbers of the grouting holes from the first column to the fourth column are 9 to 12 respectively, that is, the grouting hole 1a numbered 9, the grouting hole 1b numbered 10, the grouting hole 1c numbered 11, and the grouting hole 1d numbered 12; in the fourth row, the numbers of the grouting holes from the first column to the fourth column are 13 to 16 respectively, that is, the grouting hole 1e numbered 13, the grouting hole 1f numbered 14, the grouting hole 1g numbered 15, and the grouting hole 1h numbered 16. Usually, the horizontal row spacing (center distance between two grouting holes) and the horizontal column spacing (center distance between two grouting holes) of the grouting hole array are equal, both being s.

[0020] Step 2: Open a pore water pressure observation hole 2 on site. The pore water pressure observation hole 2 is located at the center of the grouting hole array, and a pore water pressure gauge 6 is arranged in the pore water pressure observation hole 2. The depth of the pore water pressure observation hole 2 is greater than the depth of the grouting hole 1. For example, it is 2.0 m deeper than the grouting hole 1 vertically.

[0021] Step 3: Open 5 earth pressure observation holes 3 on site. The first earth pressure observation hole 3a and the second earth pressure observation hole 3b are respectively located on both sides of the row direction of the second row of grouting holes (i.e., the side far from the center of the array row), the third earth pressure observation hole 3c is located outside the column direction of the grouting hole 15 numbered 1 (i.e., the side far from the center of the array column), the fourth earth pressure observation hole 3d is located outside the column direction of the grouting hole 18 numbered 4 (i.e., the side far from the center of the array column), and the fifth earth pressure observation hole 3e is located at the intersection of the four grouting holes 16, 17, 12, and 13 numbered 2, 3, 6, and 7. Place earth pressure gauges 7 in each earth pressure observation hole 3. Multiple earth pressure gauges 7 can be placed in one earth pressure observation hole 3, such as 7a~7h. The depth of the earth pressure observation hole 3 is greater than the depth of the grouting hole 1. The depth of the pore water pressure observation hole 2 can be equal to the depth of the earth pressure observation hole 3. The center distance between the first earth pressure observation hole 3a and the grouting hole 11 numbered 5 is 0.75s, and the center distance between the second earth pressure observation hole 3b and the grouting hole 14 numbered 8 is 0.75s. The first earth pressure observation hole 3a and the second earth pressure observation hole 3b are used to monitor the earth pressure at the position of 0.75 times the spacing of the sleeve valve pipe grouting holes; the center distance between the third earth pressure observation hole 3c and the grouting hole 15 numbered 1 is 0.5s, and the center distance between the fourth earth pressure observation hole 3d and the grouting hole 18 numbered 4 is 0.5s; the third earth pressure observation hole 3c and the fourth earth pressure observation hole 3d are used to monitor the grouting pressure at 0.5 times the drilling spacing. The fifth earth pressure observation hole 3e is used to monitor the earth pressure at 0.707 times the drilling spacing. The earth pressure gauge in the first earth pressure observation hole 3a faces the grouting hole 11 numbered 5, the earth pressure gauge in the second earth pressure observation hole 3b faces the grouting hole 14 numbered 8, the earth pressure gauge in the third earth pressure observation hole 3c faces the grouting hole 15 numbered 1, the earth pressure gauge in the fourth earth pressure observation hole 3d faces the grouting hole 18 numbered 4, and the earth pressure gauge in the fifth earth pressure observation hole 3e faces the three adjacent grouting holes 1.

[0022] Step 4: Six sampling holes 4 are opened on site. The first sampling hole 41 is located at the column center of the first column of grouting holes 1, and the second sampling hole 42 is located at the column center of the fourth column of grouting holes 1; the third sampling hole 43 is located at the intersection angle of the four grouting holes 1a, 1b, 1e, and 1f numbered 9, 10, 13, and 14, and the fourth sampling hole 44 is located at the intersection angle of the four grouting holes 1c, 1d, 1g, and 1h numbered 11, 12, 15, and 16, for monitoring the soil compressive strength at the position of 0.707 times the grouting hole spacing; the fifth sampling hole 45 is on the outside of the column direction of the grouting hole 1e numbered 13 (i.e., the side away from the column center of the array), and the sixth sampling hole 46 is on the outside of the column direction of the grouting hole 1h numbered 16 (i.e., the side away from the column center of the array). The center distance between the fifth sampling hole 45 and the grouting hole 1e numbered 13 is 0.5s, and the center distance between the sixth sampling hole 46 and the grouting hole 1h numbered 16 is 0.5s.

[0023] Step 5: The sleeve valve pipe grouting is carried out row by row using the grouting holes in each row, that is, the grouting sequence is 15 - 18 → 11 - 14 → 1a - 1d → 1e - 1h. The pore water pressure is observed using a pore water pressure gauge, the soil pressure is observed using a soil pressure gauge, and sampling is carried out using the sampling holes.

[0024] The present invention relates to a field test scheme for simulating the influence of sleeve valve pipe grouting on the surrounding environment, including the layout of sleeve valve pipe grouting holes and their construction requirements, the layout of soil displacement and deformation monitoring holes, and the layout of water level monitoring holes. This experimental scheme can comprehensively utilize the layout schemes of each grouting hole, maximize the comprehensive utilization of the information of each monitoring hole, achieve efficient acquisition of monitoring data, and realize a low-carbon and environmentally friendly test.

[0025] Compared with the prior art, it has the following advantages: (1) Determine the influence of sleeve valve pipe construction on the surrounding environment through field tests, including the soil pressures at three positions of 0.5 times the drilling grouting hole spacing, 0.707 times the grouting hole spacing, and 0.75 times the grouting hole spacing, providing support for evaluating the influence of sleeve valve pipe grouting on the surrounding environment; (2) More than 10 sleeve valve pipe grouting sections are arranged from bottom to top at the grouting end of the sleeve valve pipe, which can test different grouting pressures and comprehensively evaluate the influence of different grouting pressures on the surrounding environment; (3) Sleeve valve pipe grouting can directly utilize the construction site conditions. The holes 11 - 18 and 1a - 1h can be directly used for on-site foundation treatment, which is green and environmentally friendly; (4) The soil pressure cells and pore water pressure gauges can be recycled, and the cost is lower compared with indoor tests; (5) Sampling of the reinforcement effect of sleeve valve pipe grouting can be carried out synchronously; (6) Compared with indoor tests, the tests carried out on the actual foundation soil can truly reflect the influence of sleeve valve pipe grouting on this type of foundation soil. (7) The test operation is convenient, and the test results are intuitive and reliable. It can be directly carried out on-site using construction machinery.

[0026] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A field test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment, characterized in that: The on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment includes the following steps: Step 1: Open 16 grouting holes on-site. The grouting holes are arranged in a 4-row × 4-column grouting hole array. The numbers of the grouting holes in the first column to the fourth column of the first row are 1 to 4 respectively. The numbers of the grouting holes in the first column to the fourth column of the second row are 5 to 8 respectively. The numbers of the grouting holes in the first column to the fourth column of the third row are 9 to 12 respectively. The numbers of the grouting holes in the first column to the fourth column of the fourth row are 13 to 16 respectively; Step 2: Open a pore water pressure observation hole on-site. The pore water pressure observation hole is located at the center of the grouting hole array, and a pore water pressure gauge is arranged in the pore water pressure observation hole; Step 3: Open 5 earth pressure observation holes on-site. The first earth pressure observation hole and the second earth pressure observation hole are respectively located on both sides of the row direction of the grouting holes in the second row. The third earth pressure observation hole is located outside the column direction of the grouting hole numbered 1. The fourth earth pressure observation hole is located outside the column direction of the grouting hole numbered 4. The fifth earth pressure observation hole is located at the intersection of the four grouting holes numbered 2, 3, 6, and 7. Earth pressure gauges are arranged in each of the earth pressure observation holes; Step 4: Open 6 sampling holes on-site. The first sampling hole is located at the column center of the grouting holes in the first column. The second sampling hole is located at the column center of the grouting holes in the fourth column. The third sampling hole is located at the intersection of the four grouting holes numbered 9, 10, 13, and 14. The fourth sampling hole is located at the intersection of the four grouting holes numbered 11, 12, 15, and 16. The fifth sampling hole is located outside the column direction of the grouting hole numbered 13. The sixth sampling hole is located outside the column direction of the grouting hole numbered 16; Step 5: Use the grouting holes in each row to carry out sleeve valve pipe grouting one by one. Use the pore water pressure gauge to observe the pore water pressure, use the earth pressure gauge to observe the earth pressure, and use the sampling hole to take samples.

2. The in-situ test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 1, wherein: The depth of the pore water pressure observation hole is greater than the depth of the grouting hole.

3. The in-situ test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 1, characterized in that: The depth of the earth pressure observation hole is greater than the depth of the grouting hole.

4. The on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 1, wherein: The depth of the pore water pressure observation hole is equal to the depth of the earth pressure observation hole.

5. The on-site test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 1, characterized in that: The in-plane row spacing and in-plane column spacing of the grouting hole array are both s.

6. The in-situ test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 5, characterized in that: The center distance between the first earth pressure observation hole and the grouting hole numbered 5 is 0.75s. The center distance between the second earth pressure observation hole and the grouting hole numbered 8 is 0.75s. The center distance between the third earth pressure observation hole and the grouting hole numbered 1 is 0.5s. The center distance between the fourth earth pressure observation hole and the grouting hole numbered 4 is 0.5s.

7. The in-situ test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 5, characterized in that: The center distance between the fifth sampling hole and the grouting hole numbered 13 is 0.5s. The center distance between the sixth sampling hole and the grouting hole numbered 16 is 0.5s.

8. The in-situ test method for simulating the influence of sleeve valve pipe grouting on the surrounding environment according to claim 1, wherein: The earth pressure gauge in the first earth pressure observation hole faces the grouting hole numbered 5, the earth pressure gauge in the second earth pressure observation hole faces the grouting hole numbered 8, the earth pressure gauge in the third earth pressure observation hole faces the grouting hole numbered 1, the earth pressure gauge in the fourth earth pressure observation hole faces the grouting hole numbered 4, and the earth pressure gauge in the fifth earth pressure observation hole faces three adjacent grouting holes.

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