Shield tunneling synchronous grouting simulation test device

Abstract

The invention relates to a shield tunneling synchronous grouting simulation test device which comprises a simulation bin, two opposite soil partition plates are arranged in the simulation bin, and the space between the two soil partition plates is filled with soil to form a soil layer filling area; the plurality of simulation pipe pieces are fixed between the two oppositely arranged soil separation plates and are buried in the soil layer filling area; the simulation shield tunneling machine is slidably arranged outside the simulation duct piece in a sleeving mode, and a plurality of grouting holes are formed in the simulation shield tunneling machine; the traction device is fixedly installed on one side of the simulation bin, the traction device pulls the simulation shield tunneling machine to enable the simulation shield tunneling machine to slide in the soil layer filling area in the extension direction of the duct piece, and in the sliding process of the simulation shield tunneling machine, the simulation shield tunneling machine is driven by the traction device to slide in the extension direction of the duct piece. The grouting holes are used for grouting a gap generated by the soil and the simulation duct piece when the simulation shield tunneling machine slides so as to fill the gap; and the detection device is arranged on the simulation duct piece, so that the operation is convenient, and the use is simple.

Description

Technical Field

[0001] The invention relates to the technical field of shield simulation, in particular to a shield tunneling synchronous grouting simulation test device. Background Art

[0002] During the tunnel shield construction process, adverse geological conditions such as water-bearing sand layers and dynamic water sand layers are often encountered. If not handled properly, it is easy to cause engineering accidents. Therefore, synchronous grouting behind the shield wall is often used to fill the gap at the shield tail to prevent soil relaxation, stratum deformation and soil particle loss, improve the tunnel's anti-seepage and waterproof performance, and ensure that the early force of the segment lining is uniform and stable.

[0003] However, the strength of the soil layers in different areas is different, which will cause the loose soil layers during the excavation process, which will affect the final tunnel structure and eventually cause problems in the overall construction of the tunnel, requiring rework. Therefore, it is necessary to develop a test device that can simulate the synchronous grouting process of shield tunneling to analyze the effect of synchronous grouting of shield tunneling and its impact on the tunnel, so as to guide the design of synchronous grouting slurry ratio and grouting parameters. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a shield excavation synchronous grouting simulation test device. By setting up a simulation chamber, the soil in the section to be constructed is filled between the two earth partition plates of the simulation chamber, and the excavation of the shield machine in the soil is simulated to check the problems that may occur in the soil layer after construction.

[0005] The technical solution to achieve the above purpose is a shield tunneling synchronous grouting simulation test device, comprising:

[0006] A simulation chamber, wherein two soil partition plates are arranged opposite to each other in the simulation chamber, and soil is filled between the two soil partition plates to form a soil layer filling area;

[0007] A plurality of simulated pipe segments fixed between two oppositely disposed earth partition plates and buried in the soil filling area;

[0008] A simulated shield machine slidably sleeved outside the simulated pipe segment, wherein the simulated shield machine is formed with a plurality of grouting holes;

[0009] A traction device fixedly mounted on one side of the simulation chamber, the traction device pulls the simulated shield machine so that the simulated shield machine slides along the extension direction of the pipe segment in the soil filling area, and during the sliding process of the simulated shield machine, the grouting holes are grouted into the gaps formed by the soil and the simulated pipe segments when the simulated shield machine slides, so as to fill the gaps; and

[0010] A detection device is arranged on the simulated pipe segment.

[0011] Furthermore, rubber rings are provided between adjacent simulated pipe segments.

[0012] Furthermore, the simulated shield machine is connected to a grouting pipe, which is connected to the grouting hole. When the simulated shield machine slides along the extension direction of the simulated pipe segment, the grouting pipe injects grout toward the simulated pipe segment through the grouting hole to fill the gap between the simulated shield machine and the simulated pipe segment.

[0013] Furthermore, the detection device includes a soil pressure sensor, and a plurality of the soil pressure sensors are provided, and a plurality of the soil pressure sensors are arranged at intervals along the outer circle of the simulated pipe segment.

[0014] Furthermore, the detection device includes a pore water pressure sensor, and a plurality of the pore water pressure sensors are provided, and the plurality of the pore water pressure sensors are arranged at intervals along the outer circle of the simulated pipe segment.

[0015] Furthermore, a plurality of color rods are arranged on the inner circumference surface of the simulated tube segment.

[0016] Furthermore, a plurality of test tubes for testing soil flow are arranged in the soil filling area.

[0017] Furthermore, the test tube is formed by splicing a plurality of connection units, and two adjacent connection units are connected via a magnetic ring.

[0018] Furthermore, a plurality of cameras are arranged in the simulation chamber, and the cameras are aimed at the simulated shield machine.

[0019] Furthermore, a guide rail is provided in the simulation chamber, a portion of the guide rail extends into the soil filling area, and the simulated shield machine is slidably mounted on the guide rail.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A simulation chamber is set up, soil in the section to be constructed is filled between the two soil partitions of the simulation chamber, and the tunneling of a shield machine in the soil is simulated to check for problems that may arise in the soil layer after construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the overall structure diagram of a shield tunneling synchronous grouting simulation test device.

[0023] Figure 2 This is a diagram of the internal structure of a shield tunneling synchronous grouting simulation test device.

[0024] Figure 3This is the installation effect diagram of the soil pressure sensor of a shield tunneling synchronous grouting simulation test device.

[0025] Figure 4 This is a diagram showing the use effect of a test tube of a shield tunneling synchronous grouting simulation test device.

[0026] Figure 5 This is a front view of the use effect of a color rod of a shield tunneling synchronous grouting simulation test device.

[0027] Figure 6 A side view of the use effect of a color rod of a shield tunneling synchronous grouting simulation test device.

[0028] Figure 7 The present invention is a side view showing the use effect of a camera device of a shield tunneling synchronous grouting simulation test device.

[0029] Figure 8 The present invention is a front view showing the use effect of a camera device of a shield tunneling synchronous grouting simulation test device.

[0030] Legend: 1. Simulated shield machine; 11. Grouting hole; 2. Simulated pipe segment; 21. Earth pressure sensor; 22. Color rod; 3. Traction device; 4. Soil filling area; 41. Earth partition board; 42. Measuring pipe; 43. Magnetic ring; 44. Connection unit; 5. Simulated chamber; 6. Camera; 61. Video equipment. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] See also Figure 1 and Figure 2A shield tunneling synchronous grouting simulation test device comprises: a simulation chamber 5, wherein two earth partition plates 41 are arranged opposite to each other in the simulation chamber 5, and soil is filled between the two earth partition plates 41 to form a soil layer filling area 4; a simulated shield machine 1 is inserted into the soil layer filling area 4; a plurality of simulated segments 2 are fixed between the two earth partition plates 41 arranged opposite to each other and buried in the soil layer filling area; the simulated shield machine 1 is slidably sleeved outside the simulated segment 2, and a plurality of grouting holes are formed on the simulated shield machine, and grouting is injected between the simulated shield machine and the simulated segment through the grouting holes, When the simulated shield machine 1 slides, the tail of the shield machine is synchronously grouted to fill the gap between the simulated shield machine 1 and the simulated pipe segment 2; the traction device 3 is fixedly installed on one side of the simulation chamber 5, and the traction device 3 pulls the simulated shield machine 1 so that the simulated shield machine 1 slides along the extension direction of the pipe segment in the soil filling area 4. During the sliding process of the simulated shield machine, the grouting hole is grouted into the gap generated by the soil and the simulated pipe segment when the simulated shield machine slides to fill the gap; and the detection device is arranged on the simulated pipe segment 2.

[0033] In the present invention, a preferred implementation is: when filling soil into the soil filling area 4, the simulated shield machine 1 is sleeved on the outside of the simulated pipe segment 2, and the end of the simulated shield machine 1 and the traction device 3 are connected by a pull rope or a traction rope. The soil in the soil filling area 4 is adjusted according to the on-site construction conditions. When filling the soil, the simulated shield machine 1 is adjusted so that the simulated shield machine 1 maintains a horizontal state; after the filling is completed, the traction device 3 is started so that the simulated shield machine 1 can penetrate the soil filling area 4. At the same time, the water and soil pressure, shield tail grouting distribution, stratum settlement, and pipe segment buoyancy and other test parameters are measured through the detection device.

[0034] Furthermore, a plurality of measuring tubes 42 are provided in the soil filling area 4. The measuring tubes 42 are located above the simulated shield machine 1 and are arranged in contact with the inner wall of the simulated chamber 5. The measuring tubes 42 are arranged at intervals along the extension direction of the simulated pipe segment 2. The inner wall of the simulated chamber 5 is made of transparent material, so that the situation in the simulated chamber 5 can be easily observed. In the process of the simulated shield machine 1 moving forward, the soil layer above the simulated shield machine 1 may sink or float due to the movement of the simulated shield machine 1, or in the process of grouting, the soil layer above may sink or float due to the injection of slurry. By observing the changes in the upper and lower positions of the measuring tubes 42, the sinking and floating of the soil layer can be checked.

[0035] Furthermore, the soil partition board 41 is made of a transparent material to facilitate observation by test personnel. Preferably, the soil partition board 41 can be a transparent glass plate or a transparent plastic plate.

[0036] Furthermore, the traction device 3 can be a jack or a winch, and the jack and the simulated shield machine 1 are connected by a traction rope. When in use, the jack is first lifted to the highest position, and then a traction rope is set between the jack and the simulated shield machine 1. The jack is slowly lowered so that the jack descends in the direction away from the earth partition board 41 to pull the simulated shield machine 1, so that the simulated shield machine 1 imitates the movement of the shield machine during construction. The simulated shield machine 1 can also be pulled by a winch.

[0037] Furthermore, the simulated shield machine 1 is filled with simulated segments 2, and the ends of the simulated segments 2 at both ends are fixed to the earth partition 41. When the simulated shield machine 1 moves, the simulated segments 2 are pulled out of the simulated shield machine 1. Preferably, when the simulated shield machine 1 moves toward the traction device 3, the simulated shield machine 1 moves, and the simulated segments 2 are pulled out of the shield tail of the simulated shield machine 1, thereby simulating the moving procedure of the shield machine placing the segments of the tunnel in the actual construction process. Preferably, the detection device is arranged on the simulated segment 2 to detect the pressure change of the soil layer after the segment is set.

[0038] Furthermore, rubber rings are provided between adjacent simulated segments 2 to ensure the connection between the simulated segments 2.

[0039] Furthermore, the simulated pipe segment 2 is made of a transparent material to facilitate observation by test personnel.

[0040] Furthermore, the bottom edge, upper edge and side edge of the simulated tube segment 2 are provided with tight-fitting optical fibers. The tight-fitting optical fibers are arranged at intervals in the simulated tube segment 2, and the distances between the tight-fitting optical fibers at various positions and the central axis of the simulated tube segment 2 are not equal. There is a certain interval between each tight-fitting optical fiber. The longitudinal strain of the detection section is measured by the BOTDA nanometer to observe whether the tube segment is deformed and whether the tube segment sinks or floats.

[0041] Furthermore, the simulated shield machine 1 is connected with a grouting pipe, and a grouting hole 11 is formed on the simulated shield machine 1. When the simulated segment 2 is removed from the simulated shield machine 1, the grouting hole 11 is grouted between the simulated shield machine 1 and the simulated segment 2 to fill the gap between the simulated shield machine 1 and the simulated segment 2. Preferably, the grouting pipe partially extends outside the soil filling area 4 and is connected to a grouting device, which can be a pump. When in use, the grouting pressure and rate of the grouting device are adjusted to be consistent with the on-site construction.

[0042] See also Figure 3 and Figure 4Further, the detection device includes a soil pressure sensor 21, and a plurality of soil pressure sensors 21 are provided, and a plurality of soil pressure sensors 21 are provided at intervals along the outer ring of the simulated pipe segment 2. Preferably, the soil pressure sensor 21 is provided every 15 degrees along the outer diameter of the simulated pipe segment 2.

[0043] Furthermore, the detection device includes a pore water pressure sensor, and a plurality of the pore water pressure sensors are provided, and the plurality of the pore water pressure sensors are arranged at intervals along the outer circle of the simulated pipe segment 2 .

[0044] Preferably, when grouting toward the simulated shield machine 1 and the simulated segment 2, when the slurry is in liquid state, the pore water pressure sensor is more accurate in testing the slurry pressure; and when the slurry is solidified, the soil pressure sensor 21 is more accurate in testing the slurry pressure. Therefore, the soil pressure sensor 21 and the pore water pressure sensor are used jointly to test the slurry pressure in the shield tail gap.

[0045] See also Figure 5 and Figure 6 Furthermore, a plurality of color rods 22 are provided in the simulated segment 2. For the convenience of observation, the color rods 22 are pasted or welded in the pipe section of the simulated segment 2. Ten single rods with different colors (each ring is 36° apart) or only a pair of color rods 22 are provided on the important simulated segment 2 to make the observation clearer. The change of the axis of the simulated segment 2 can be judged by the identification of the color rods 22, so as to estimate the floating amount and whether the displacement has occurred.

[0046] Furthermore, a plurality of test tubes for testing the settlement and uplift of the soil layer are arranged in the soil filling area 4. The movement of the soil can be observed through the changes in the test tubes, so that the observation can be carried out more conveniently.

[0047] Furthermore, the test tube is composed of a plurality of connection units 44, and two adjacent connection units 44 are connected by a magnetic ring 43. Preferably, when the soil in the soil layer sinks or floats, the soil in the soil layer drives the connection unit 44 to deflect along the flow direction of the soil, and the connection units 44 at different positions can observe the movement of the soil in real time.

[0048] Furthermore, the test tube is arranged close to the earth partition plate 41 , and the changes of the test tube are observed through the earth partition plate 41 . There are three test tubes, two of which are arranged on both sides of the simulated shield machine 1 , and the other is arranged on the top of the simulated shield machine 1 .

[0049] See also Figure 7 and Figure 8Further, a plurality of cameras 6 are arranged in the simulation chamber 5, and the cameras 6 are arranged to be aimed at the simulated shield machine 1. The cameras 6 are used to monitor the changes in the soil filling area 4 to observe the pipe segment deviation and floating of the simulated pipe segment 2.

[0050] Furthermore, a camera 6 is used to visually observe and record the flow path of the grouting. A cantilever rod is welded to the outermost side of the simulated shield machine 1 and extends to the tail of the shield shell of the simulated shield machine 1. Four camera devices 61 are installed facing the four grouting holes 11 to record grouting images in different directions on the glass segment.

[0051] Furthermore, in addition to the pictures taken by the camera 6 in the pipe section, the final shape of the slurry is the most intuitive way to judge the grouting effect. One week after the grouting process, the covering soil around the slurry is excavated and exposed to make the slurry shape visible and easy to measure. After measurement, the final two-dimensional annular slurry shape and grouting pressure curve are compared for further analysis. A uniform distribution of slurry is an effective grouting case.

[0052] Furthermore, a guide rail is provided in the simulation chamber 5 , and a portion of the guide rail extends into the soil filling area 4 , and the simulated shield machine 1 is slidably mounted on the guide rail.

[0053] The following is an explanation of the use of a shield tunneling synchronous grouting simulation test device of the present invention.

[0054] When filling soil into the soil filling area 4, the simulated shield machine 1 is sleeved on the outside of the simulated pipe segment 2, and the end of the simulated shield machine 1 and the traction device 3 are connected by a pull rope or a traction rope. The soil in the soil filling area 4 is adjusted according to the on-site construction conditions. First, part of the soil is filled in the soil filling area 4, and test pipes are vertically set on both sides of the setting position of the simulated pipe segment 2, the simulated pipe segment 2 and the simulated shield machine 1 are installed, and the simulated shield machine 1 is adjusted to keep the simulated shield machine 1 in a horizontal state; continue to fill the soil, and after the filling is completed, start the traction device 3 so that the simulated shield machine 1 can penetrate the soil filling area 4. At the same time, through the detection device, test parameters such as water and soil pressure, shield tail grouting distribution, stratum settlement and pipe segment buoyancy are measured. Preferably, when the traction device pulls the simulated shield machine, the simulated shield machine simulates the shield machine during actual construction to move forward in the soil filling area. During the movement of the simulated shield machine, the soil around the simulated shield machine flows in a direction away from the simulated shield machine. The flow direction of the soil is checked by observing the deflection direction of the connection unit of the test tube, and the settlement of the soil is observed by observing the position of the test tube located above the simulated shield machine. During the movement of the simulated shield machine, grouting is simultaneously performed between the simulated shield machine and the simulated segment, and the pressure generated during grouting is detected by using a soil pressure sensor and a pore water pressure sensor, and the deflection direction of the connection unit of the test tube is observed to check the flow direction of the soil, and the settlement of the soil is observed by observing the position of the test tube located above the simulated shield machine. After the grouting slurry solidifies, the color rod located in the simulated segment is observed, and the positions of the color rods of different simulated segments are compared to observe whether the simulated segment rises or falls. Preferably, during the simulated construction process, a camera is used to record the changes in the soil filling area in real time, so as to facilitate the construction personnel to make adjustments during actual construction.

[0055] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A shield tunneling synchronous grouting simulation test device, characterized in that: include: A simulation chamber, wherein two soil partition plates are arranged opposite to each other in the simulation chamber, and soil is filled between the two soil partition plates to form a soil layer filling area; A plurality of simulated pipe segments fixed between two oppositely disposed earth partition plates and buried in the soil filling area; A simulated shield machine slidably sleeved outside the simulated pipe segment, wherein a plurality of grouting holes are formed on the shield tail of the simulated shield machine; A traction device fixedly mounted on one side of the simulation chamber, the traction device pulls the simulated shield machine so that the simulated shield machine slides along the extension direction of the pipe segment in the soil filling area, and during the sliding process of the simulated shield machine, the grouting hole is grouted into the gap between the soil and the simulated pipe segment when the simulated shield machine slides, so as to fill the gap; And a detection device arranged on the simulated pipe segment.

2. A shield tunneling synchronous grouting simulation test device according to claim 1, characterized in that: Rubber rings are arranged between adjacent simulated pipe segments.

3. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: The simulated shield machine is connected to a grouting pipe, which is connected to the grouting hole. When the simulated shield machine slides along the extension direction of the simulated pipe segment, the grouting pipe injects grout toward the simulated pipe segment through the grouting hole to fill the gap between the simulated shield machine and the simulated pipe segment.

4. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: The detection device comprises a soil pressure sensor, and a plurality of the soil pressure sensors are arranged, and a plurality of the soil pressure sensors are arranged at intervals along the outer circle of the simulation segment.

5. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: The detection device comprises a pore water pressure sensor, and a plurality of the pore water pressure sensors are arranged at intervals along the outer circle of the simulation segment.

6. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: A plurality of color rods are arranged on the inner circumference surface of the simulated tube segment.

7. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: A plurality of test tubes for testing soil flow are arranged in the soil layer filling area.

8. The shield tunneling synchronous grouting simulation test device according to claim 7 is characterized in that: The test tube is formed by splicing a plurality of connection units, and two adjacent connection units are connected via a magnetic ring.

9. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: Several cameras are arranged in the simulation chamber, and the cameras are aimed at the simulated shield machine.

10. The shield tunneling synchronous grouting simulation test device according to claim 1 is characterized in that: A guide rail is arranged in the simulation chamber, a part of which extends into the soil filling area, and the simulated shield machine is slidably arranged on the guide rail.

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