A simulation device for pipe jacking construction under the coupling action of stratum stress

Abstract

The application discloses a kind of stratum stress coupling under pipe jacking construction simulation device, comprising: stratum simulation unit, stratum simulation unit includes: stratum simulation device, stratum stress simulation soil body, stress loading hole, air compressor and water inlet tank, stratum stress simulation soil body is based on the soil sample of the field of the region to be simulated to be filled in stratum simulation device in the mode of layered compaction, and obtained, the stress loading hole is filled with expansion agent;Pipe jacking simulation unit, pipe jacking simulation unit includes: water supply pipe section, pipe jacking cutting drill and jacking device, pipe jacking cutting drill is set to water supply pipe section head to complete tunneling operation, and jacking device is set to water supply pipe section end to complete pipe body jacking operation;Monitoring unit, monitoring unit includes: monitoring system and several stress sensors, monitoring system real-time monitoring stratum stress simulation soil body stress change when pipe jacking cutting drill is at each speed, and completes corresponding test data record and analysis.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of underground construction engineering test, and particularly relates to a pipe jacking construction simulation device under the coupling action of stratum stress. BACKGROUND

[0002] With the development of urban construction and the development of underground space, when the pipeline construction of city water supply engineering bypasses the building group, the traditional open cut construction causes great obstacles to the traffic, environment and space utilization of the region, so the pipe jacking construction method for solving the above problems is a common trenchless pipeline construction laying technology in municipal pipeline engineering construction. However, the existing pipe jacking construction will affect the soil body in the tunneling range, and the influence of the change law of soil stress and the tunneling rate, size and range in the tunneling process is not clear at present. The influence of the change of overlying load of stratum after construction on the pipe is not clear.

[0003] Chinese patent: an indoor test simulation system for pipe jacking construction, application number 201910057792.9 provides a model experiment device that can be used to simulate the pipe jacking construction process, but the real complex stratum stress environment is not really inverted. Therefore, it is necessary to provide a pipe jacking construction simulation monitoring device under the coupling action of complex stratum stress for the above technical deficiencies of the prior art. SUMMARY

[0004] The purpose of the present application is to solve the problems that the stratum stress in the pipe jacking construction range of the existing pipe jacking construction technology and simulation device cannot be remodeled, the time and space evolution of the soil stratum stress cannot be obtained, the influence law of the jacking rate in the tunneling process on the soil stratum stress is not easy to obtain, and the influence factors of the change of overlying load and stratum stress after construction on the stability of pipe use are not clear. Based on this, a pipe jacking construction simulation device under the coupling action of stratum stress is developed. The stratum simulation unit of the present application realizes accurate regulation and control of complex stratum stress, and the monitoring unit monitors the time and space evolution law of the jacking rate and stratum stress at any time.

[0005] The purpose of the present application is realized by the following technical scheme:

[0006] A pipe jacking construction simulation device under the coupling action of stratum stress, the pipe jacking construction simulation device comprises:

[0007] The stratum simulation unit comprises a stratum simulation device, a stratum stress simulation soil body, stress loading holes, an air compressor and a water inlet tank. The stratum simulation device is provided with a hole body structure as a jacking working face at both ends. The stratum stress simulation soil body is obtained by filling the stratum simulation device in a layered compaction manner based on a soil sample taken from a site of a region to be simulated. The stratum stress simulation soil body is provided with a plurality of stress loading holes. The stress loading holes are filled with an expanding agent. The stress loading holes are connected to the air compressor and the water inlet tank through a pipe body.

[0008] The pipe jacking simulation unit comprises a water supply pipe section, a pipe jacking cutting drill and a jacking device. The pipe jacking cutting drill is arranged at the head of the water supply pipe section to complete the tunneling operation. The jacking device is arranged at the tail end of the water supply pipe section to complete the pipe body jacking operation.

[0009] The monitoring unit comprises a monitoring system and a plurality of stress sensors. The stress sensors are arranged in the stratum stress simulation soil body and connected to the monitoring system respectively. The monitoring system is also connected to the control system of the pipe jacking cutting drill to monitor the stress change of the stratum stress simulation soil body in real time when the pipe jacking cutting drill is at each speed and complete the recording and analysis of the corresponding test data.

[0010] According to a preferred embodiment, the stratum stress simulation soil body has the same soil layer structure as the site of the region to be simulated. Each soil layer structure is filled in the stratum simulation device in a layered compaction manner.

[0011] According to a preferred embodiment, each stress loading hole is arranged in the stratum stress simulation soil body in a transverse and longitudinal manner based on the stratum stress change trend of the site of the region to be simulated.

[0012] According to a preferred embodiment, each stress loading hole is provided with an appropriate amount of expanding agent as a stress loading source based on each stratum stress level of the site of the region to be simulated. The expanding agent expands in volume after reacting with the water input by the water inlet tank to achieve stress loading and accumulation of the stratum stress simulation soil body. The water inlet tank also applies the osmotic water pressure to the stratum stress simulation soil body through the conduit based on the water inlet pump.

[0013] According to a preferred embodiment, the air compressor performs stress auxiliary fine adjustment at each stress loading hole and unloading recovery of the expanding agent through air pressure.

[0014] According to a preferred embodiment, the stratum simulation unit further comprises a lateral pressure apparatus, which obtains bearing strength and deformation data of the stratum stress simulation soil based on a probe arranged in the stratum stress simulation soil, and provides data support for accurately simulating the real environment of the stratum stress simulation soil under multiple stratum stress coupling under different overburden loads in the construction site in a zoned and layered manner.

[0015] According to a preferred embodiment, the pipe jacking simulation unit further comprises a laser positioning monitoring device, and the pipe jacking cutting drill completes the deviation correction of the tunneling direction based on the laser line of the laser positioning monitoring device.

[0016] According to a preferred embodiment, the rear end of the pipe jacking cutting drill is provided with a spherical rotation device for adjusting the tunneling direction, the pipe jacking cutting drill comprises a rotating disc and a rotating motor, the rotating disc is provided with a cutting tip, an unearthing hole and a pressure stress sensor for monitoring the earth pressure and jacking pressure in the jacking tunneling process, and the bottom end of the rotating disc is connected with the spherical rotation device.

[0017] According to a preferred embodiment, the rear end of the pipe jacking cutting drill is further provided with a spiral unearthing machine for realizing the transmission of the soil and an unearthing box for containing the soil.

[0018] According to a preferred embodiment, the pressure stress sensor is also arranged on the sidewall of the water supply pipe section, and when the water supply pipe section is installed, the water pressure is applied to the inside of the pipe by the water pump, the sealing property of the water supply pipe section is ensured, there is no water leakage, the wall pressure and strain data of the water supply pipe section are collected, and the stress data in the stratum stress simulation soil are collected at the same time.

[0019] The foregoing main scheme of the present application and each further selected scheme thereof can be freely combined to form multiple schemes, which are all the schemes that can be adopted and claimed by the present application. A person skilled in the art can understand that there are multiple combinations according to the prior art and common knowledge after understanding the scheme of the present application, which are all the technical schemes claimed by the present application, and are not listed here.

[0020] The simulation device provided by the present application can accurately shape the real environment of stratum stress, simulate the influence degree of pipe jacking construction on ground subsidence and soil stress disturbance and change, and further study and determine the related engineering parameters of pipe jacking construction, such as stratum stress disturbance, pipe diameter, pipe jacking depth and other factors. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1is a structural schematic diagram of the pipe jacking construction simulation device of the present application;

[0022] Figure 2 is a turntable schematic diagram of the pipe jacking cutting drill of the pipe jacking construction simulation device of the present application;

[0023] Figure 3 is a structural schematic diagram of the water supply pipe section of the pipe jacking construction simulation device of the present application;

[0024] Figure 4 is a layout structural schematic diagram of the lateral pressure gauge of the pipe jacking construction simulation device of the present application;

[0025] Figure 5 is a test structural schematic diagram of the pipe jacking construction simulation device of the present application after the water supply pipe section is installed;

[0026] wherein, 1 is a stratum simulation device, 2 is a stratum stress simulation soil body, 3 is a stress loading hole, 4 is a guide pipe, 6 is a lateral pressure gauge, 7 is an air compressor, 8 is a water inlet tank, 9 is a monitoring system, 10 is a pressure stress sensor, 11 is a light distance sensor, 12 is a pipe jacking cutting drill, 13 is a cutting tip, 14 is a laser positioning monitoring device, 15 is a spherical body rotating device, 16 is a spiral unearthing machine, 18 is a guide rail, 19 is a conveyor belt, 20 is a jacking device, 21 is a water supply pipe section, and 22 is a water supply pump. DETAILED DESCRIPTION

[0027] The present application will be described in greater detail by way of specific embodiments, and as such, one skilled in the art can easily figure out other advantages and effects of the present application from the disclosure herein. The present application can also be implemented or applied by different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. It should be noted that, in order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship of the present application when it is commonly placed during use, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", "suspension" and the like do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the present application points out that in the present application, if the specific structures, connection relationships, positional relationships, power source relationships and the like are not specifically written, the structures, connection relationships, positional relationships, power source relationships and the like involved in the present application are all known by those skilled in the art on the basis of the prior art, without creative labor.

[0030] Reference Figures 1 to 5 As shown in the drawings, the present application discloses a pipe jacking construction simulation device under the action of stratum stress coupling, the pipe jacking construction simulation device comprises a stratum simulation unit, a pipe jacking simulation unit and a monitoring unit, wherein the stratum simulation unit is used to realize the simulation of the field geological state of the region to be simulated; the pipe jacking simulation unit is used to realize the simulation of the pipe jacking process, and the monitoring unit is used to realize the stress state monitoring of the pipe jacking process and the completed pipe body installation.

[0031] Preferably, the stratum simulation unit comprises a stratum simulation device 1, a stratum stress simulation soil body 2, a stress loading hole 3, an air compressor 7 and a water inlet tank 8.

[0032] Preferably, the stratum simulation device 1 adopts a high-strength transparent acrylic plate material composed of a cover box, two pairs of surfaces where the short edges are located are provided with openings as jacking working surfaces, and the opening diameters are converted according to the required simulation ratio. A light distance sensor 11 is arranged on the top of the box to realize the thickness measurement of each filling soil layer.

[0033] Preferably, the stratum stress simulation soil body 2 is obtained by filling the stratum simulation device 1 in a layered compaction manner based on the soil sampling of the field of the region to be simulated. The stratum stress simulation soil body 2 has the same soil layer structure as the field of the region to be simulated, and each soil layer structure is filled in the stratum simulation device 1 in a layered compaction manner.

[0034] The stratum stress simulation soil body belongs to remolded soil, and the soil body of the field in-situ test belongs to undisturbed soil, which has certain density, water content and compaction degree. Through the layered compaction operation, the stratum stress simulation soil body is close to the compaction degree of the soil body of the in-situ test, so that the data precision of the indoor simulation test is better matched with the in-situ test data. Moreover, through the layered compaction operation, the stress state of the remolded soil body during the later loading does not cause excessive stress drop and loss, and does not need to perform excessive stress loading compensation operation.

[0035] Preferably, the stratum stress simulation soil body 2 is obtained by filling the stratum simulation device 1 in a layered compaction manner based on the soil sampling of the field of the region to be simulated. The stratum stress simulation soil body 2 has the same soil layer structure as the field of the region to be simulated, and each soil layer structure is filled in the stratum simulation device 1 in a layered compaction manner.

[0036] Further, each stress loading hole 3 is arranged in the stratum stress simulation soil body 2 in a horizontal and vertical manner based on the stratum stress change trend of the field of the region to be simulated.

[0037] Further, each stress loading hole 3 is arranged in the stratum stress simulation soil body 2 in a horizontal and vertical manner based on the stratum stress change trend of the field of the region to be simulated.

[0038] Specifically, the stress loading hole 3 is set according to the ground stress change data obtained by the field stratum survey. The stress loading hole 3 is set according to the stratum stress change trend. Before setting, indoor pre-test is needed to determine the influence law of the interval and quantity of the stress loading hole on the stress change of the stratum simulation soil body. The influence range of the self-expanding action of the different parameters of the expanding agent on the stress loading is determined before the horizontal and vertical intervals are determined, and the size and quantity of the intervals are determined. The horizontal and vertical intervals are set because the stress of the soil body changes at different depths along the three-dimensional space.

[0039] For example, the chemical formula of the expanding agent used in the present application is:

[0040] Al2O3+3(CaSO4·2H2O)+3Ca(OH)2+23H2O=3CaO·Al2O3·3CaSO4·32H2O (ettringite)

[0041] The generated ettringite solid phase expands to 2-3 times the original volume when not constrained by unconfined conditions, and the volume expansion can load and accumulate stress on the soil, quickly simulating the actual stress state of the in-situ soil.

[0042] Further, the water inlet tank 8 also applies a seepage water pressure to the ground stress simulation soil 2 based on the water inlet pump and the conduit 4.

[0043] Specifically, the seepage pressure, also known as hydrodynamic pressure, refers to the pressure of water on a unit volume of soil in the seepage direction. The simulation of seepage water pressure is based on the presence of groundwater in the real stratum, and the seepage force exerted by water between soil particles will affect the stress change during jacking. The water inlet tank 8, the water inlet pump and the conduit 4 are connected, and water can be supplied to a specific soil layer area through the conduit 4, i.e. seepage water pressure can be applied. The setting is based on the pressure of the underground water obtained from the in-situ test survey data, and the range threshold for application is determined through pre-experiments in the laboratory.

[0044] Preferably, the air compressor 7 performs auxiliary fine tuning of stress at each stress loading hole 3 and unloads and recovers the expansion agent by air pressure.

[0045] The working principle of the air compressor is to convert the mechanical energy of the prime mover (usually an electric motor) into gas pressure energy. It is a device for generating compressed air pressure, which is a machine that uses air compression principle to produce compressed air with pressure higher than atmospheric pressure.

[0046] The air injection hole is connected with the stress loading hole 3, and the setting basis is the same as the stress loading hole 3. After the self-expansion reaction of the expansion agent is completed, if the required stress state is not reached, the air compressor 7 can be used to perform auxiliary loading by air pressure. The precision and order of magnitude of the loading are higher than the expansion stress of the expansion agent.

[0047] Preferably, the stratum simulation unit further comprises a lateral pressure meter 6. The lateral pressure meter 6 obtains the bearing capacity strength and deformation data of the ground stress simulation soil 2 based on the probe arranged in the ground stress simulation soil 2, and provides data support for accurately simulating the real environment of the ground stress simulation soil 2 under different overburden loads and multiple ground stress couplings in the construction site.

[0048] Preferably, the pipe jacking simulation unit comprises a water supply pipe section 21, a pipe jacking cutting drill 12 and a jacking device 20. The pipe jacking cutting drill 12 is arranged at the head of the water supply pipe section 21 to complete the tunneling operation, and the jacking device 20 is arranged at the end of the water supply pipe section 21 to complete the pipe jacking operation.

[0049] Preferably, the jacking pipe simulation unit further comprises a laser positioning monitoring device 14, and the jacking pipe cutting drill machine completes the deviation correction of the tunneling direction based on the laser line of the laser positioning monitoring device 14.

[0050] Further, the rear end of the jacking pipe cutting drill machine 12 is provided with a ball rotation device 15 for adjusting the tunneling direction, and the jacking pipe cutting drill machine 12 comprises a rotation disc and a rotation motor, the rotation disc is provided with a cutting tip 13, an unearthing hole and a pressure stress sensor 10 for monitoring the earth pressure and jacking pressure in the jacking tunneling process, and the bottom end of the rotation disc is connected with the ball rotation device 15. The tunneling direction of the drill machine is monitored in real time based on the laser positioning monitoring device 14, and the azimuth control is performed by the ball rotation device 15.

[0051] Preferably, the rotation disc is further provided with a water inlet hole. The water inlet hole and the unearthing hole are respectively arranged with a flow meter and an electronic valve.

[0052] Preferably, the rear end of the jacking pipe cutting drill machine is further provided with a spiral unearthing machine 16 for realizing the transmission of the soil body and an unearthing box for containing the soil body. The soil body in the pipeline of the unearthing hole of the jacking pipe cutting drill machine 12 is transported into the unearthing box 17 by driving the spiral blade to rotate, and after the unearthing box is filled with the soil body, the unearthing box is transported out by the guide rail 18 and the conveying belt 19.

[0053] Preferably, the jacking device 20 is a rigid support installed on the temporary back abutment wall at a certain distance behind the stratum simulation device 1, a main jacking jack is connected to the support through a nut, an annular jacking iron, a guide rail for positioning and conveying is installed below the jacking pipe, the pipe material of the jacking pipe is conveniently transported, and the real jacking pipe construction procedure is simulated.

[0054] Preferably, the water supply pipe section 21 is set to a specific size and thickness according to the model ratio, and is made of PE pipe, PVC pipe, nodular cast iron pipe and other materials commonly used in municipal water supply engineering, one end is protruding, and the other end is provided with a buckle groove, so that the previous pipe section and the next pipe section are connected and formed.

[0055] Preferably, the pressure stress sensor 10 is also arranged on the side wall of the water supply pipe section 21. After the water supply pipe section 21 is installed, water pressure is applied to the inside of the pipeline through the water supply pump 22, and the sealing property of the water supply pipe section 21 is ensured without water leakage. The monitoring system 9 collects the pipe wall pressure and strain data of the water supply pipe section 21, and simultaneously collects the stress data of the stratum stress simulation soil body 2.

[0056] The monitoring unit comprises a monitoring system 9 and a plurality of pressure stress sensors 10, part of the pressure stress sensors 10 being arranged in the stratum stress simulation soil body 2 and being connected to the monitoring system 9 respectively. The monitoring system 9 is also connected to the control system of the pipe jacking cutting drill 12, so as to monitor the stress change of the stratum stress simulation soil body 2 when the pipe jacking cutting drill 12 is at each speed in real time and complete the recording and analysis of the corresponding test data.

[0057] In a specific implementation scenario, the pipe jacking construction simulation device of the present application completes the pipe jacking construction simulation under the coupling action of complex stratum stress through the following implementation steps:

[0058] Step 1: manufacturing the stratum simulation device 1: a model box body of a certain proportion is manufactured by using a high-strength transparent acrylic plate, a hole of a certain size is arranged on the short side of the box body, and the size of the hole is arranged according to the working face of the pipe jacking cutting drill 12.

[0059] Step 2: reshaping the stratum soil body: the stratum stress simulation soil body 2 is selected according to different geological conditions, for the convenience of describing the implementation case of the present application, clay is selected as the soil sample of the implementation case according to the on-site investigation and soil taking, the strength parameters of the soil body are tested before the test, and the clay is backfilled into the stratum simulation device 1 by using the layered compaction method. Due to the limitation of the model size, the model size and the pipe size are converted according to the pipe jacking construction depth and the measured stratum stress.

[0060] Step 3: the stress loading holes 3 are reasonably arranged in the stratum stress simulation soil body 2 according to a certain horizontal spacing and longitudinal spacing, and the spacing and the threshold value of the loading can be adjusted according to the specific stratum stress. For example, the number of the stress loading holes 3 can be increased and the spacing can be reduced to simulate the soil layer under a large load when simulating a deep underground buried soil layer or a soil layer with a large overburden load.

[0061] Step 4: different amounts of the expansion agent 5 are filled in the stress loading holes 3, and the amount is adjusted according to the required on-site stratum stress. The expansion stress generated by the expansion of the expansion agent 5 can perform twice consolidation loading on the stratum stress simulation soil body 2 and form a soil layer stress accumulation environment.

[0062] Step 5: after the stress loading holes 3 are filled with different amounts of the expansion agent 5, the heat-resistant silica gel type conduit 4 is connected with the air compressor 7 and the water inlet tank 8, the water inlet tank 8 triggers the chemical reaction of the expansion agent through the water inlet pump to expand the volume and perform stress loading, and the air compressor 7 adjusts the stratum stress through the air inlet flow.

[0063] Step 6: the water inlet tank 8 is communicated with the conduit 4 through the water inlet pump, and the valve is opened to simulate the hydrostatic pressure and the water-rich environment under the stratum stress environment.

[0064] Step 7: The probe of the side pressure instrument 6 is buried in the stratum stress simulation soil body 2 to obtain data such as soil strength and deformation.

[0065] Step 8: The monitoring unit is arranged: the pressure stress sensors 10 are arranged at different positions in the stratum simulation device 1 at a certain interval and are connected with the monitoring system 9, are connected with the computer to transmit the stress change in real time, the stress change data are transmitted to the analysis system of the computer port, the computer port is connected with the control system of the pipe jacking and cutting drill 12, the stress change and the rotation speed in the pipe jacking process are monitored and controlled in real time, and the test data are recorded and analyzed, and the drill speed can be controlled in real time.

[0066] Step 9: The pipe simulation unit is arranged: the pipe jacking and cutting drill 12 mainly comprises a magnetic rotating motor and a rotating disc, the rotating disc is rotated after the rotating motor is powered on, a cutting tip 13 is installed on the rotating disc, a water inlet hole and an earth outlet hole are reserved, a certain number of pressure stress sensors 10 are arranged around the cutting tip 13 and are connected with the monitoring system 9 in cooperation, the soil pressure and the jacking pressure in the jacking and tunneling process are monitored, the bottom of the rotating disc is connected with a spherical body rotating device 15, data communication is performed with the laser positioning monitoring device 14, and the orientation deviation in the pipe jacking process is rectified.

[0067] Step 10: The spiral earth removal machine 16 is connected, the spiral rod and the spiral blade are rotated by the power of the electric rotating machine, the soil in the earth outlet hole is transmitted to the earth removal box 17, an electronic valve and a flowmeter are arranged at the connection position of the earth outlet hole and the spiral rod, and the earth removal speed and the earth removal capacity are controlled and mastered.

[0068] Step 11: The pipe jacking device 20 is installed, a counterforce support wall is arranged at the rear side of the stratum simulation device 1, a rigid support is installed on the temporary counterforce rear seat wall, a main jacking jack is fixedly installed and connected by a nut, an annular jacking iron suitable for the test pipe is installed, is in contact with the water supply pipe joint 21, and is placed on the conveying guide rail 18.

[0069] Step 12: According to the model ratio and size, the PE pipe, the PVC pipe and the nodular cast iron pipe commonly used in municipal water supply engineering are used to manufacture a pipe with a diameter of DN600 or DN300, and the ratio of the length of the pipe joint to the diameter of the pipe can be 16:1.

[0070] Step 13: The water supply pipe joint 21 is set to a specific size and thickness according to the model ratio and is made of the PE pipe, the PVC pipe and the nodular cast iron pipe commonly used in municipal water supply engineering, one end is protruding, and the other end has a buckle groove, so that the previous pipe joint is connected with the next pipe joint. Stress and strain sensors are arranged around the pipe joint and are connected with the monitoring system 9 to transmit data.

[0071] Step 14: After the installation of the water supply pipe section 21 is completed, the water supply pump 22 is opened to apply water pressure to the inside of the pipe and ensure the sealing of the water supply pipe section 21 without water leakage, and the pipe wall pressure and strain data of the water supply pipe section 21 are observed, and the stress changes in the stratum stress simulation box are observed.

[0072] The application innovatively proposes the influence law of the soil layer ground stress of the inversion pipe jacking construction simulation device on the pipe jacking construction driving range and driving speed.

[0073] In the prior art, based on the strong difference of the stratum soil body and the low accuracy of the stratum stress simulation, the analysis and research on the ground disturbance or settlement of the pipe jacking construction mainly focuses on numerical simulation research, and the simulation device proposed in the application can accurately shape the real environment of the stratum stress, simulate the influence degree of the pipe jacking construction on the ground settlement and the soil body stress disturbance and change, and further research and determine the related engineering parameters of the pipe jacking construction, such as the stratum stress disturbance, the pipe diameter, the pipe jacking buried depth and other factors.

[0074] Moreover, the application can simulate the real stratum stress environment in a short time, has low time cost, can real-time master the changes of the stratum stress of the simulation device, has high accuracy, can better guide the pipe jacking construction with the simulation data and parameter characteristics, and has high engineering value and economic benefits.

[0075] The above only describes the preferred embodiments of the application and should not be used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A simulation device for pipe jacking construction under the coupling of stratum stress, characterized in that, The pipe jacking construction simulation device comprises: The stratum simulation unit comprises a stratum simulation device (1), a stratum stress simulation soil body (2), stress loading holes (3), an air compressor (7), and a water inlet tank (8), Both ends of the stratum simulation device (1) are provided with hole body structures as pipe jacking working surfaces, the stratum stress simulation soil body (2) is obtained by filling the stratum simulation device (1) in a layered compaction manner based on soil sampling at a site of a region to be simulated, and a plurality of stress loading holes (3) are arranged in the stratum stress simulation soil body (2), the stress loading holes (3) are filled with expanding agents, and the stress loading holes (3) are connected to the air compressor (7) and the water inlet tank (8) through pipes. The pipe jacking simulation unit comprises a water supply pipe section (21), a pipe jacking cutting drill (12), and a pipe jacking device (20), the pipe jacking cutting drill (12) is arranged at the head of the water supply pipe section (21) to complete the tunneling operation, and the pipe jacking device (20) is arranged at the tail end of the water supply pipe section (21) to complete the pipe jacking operation. The monitoring unit comprises a monitoring system (9) and a plurality of stress sensors (10), the stress sensors (10) are arranged in the stratum stress simulation soil body (2) and are connected to the monitoring system (9) respectively, the monitoring system (9) is also connected to the control system of the pipe jacking cutting drill (12), the stress change of the stratum stress simulation soil body (2) when the pipe jacking cutting drill (12) is at each speed is monitored in real time, and the corresponding test data are recorded and analyzed. Each stress loading hole (3) is arranged in the stratum stress simulation soil body (2) in a horizontal and vertical manner based on the stratum stress change trend at the site of the region to be simulated. Based on the stratum stress level at the site of the region to be simulated, an appropriate amount of expanding agent is arranged in each stress loading hole (3) as a stress loading source, the expanding agent expands in volume after reacting with the water input from the water inlet tank (8), thereby achieving stress loading and accumulation of the stratum stress simulation soil body (2); the water inlet tank (8) also applies the water pressure of the permeated water to the stratum stress simulation soil body (2) through the conduit based on the water inlet pump. The air compressor (7) performs stress auxiliary fine adjustment at each stress loading hole (3) and unloads and recycles the expanding agent through air pressure.

2. The pipe jacking simulation apparatus of claim 1, wherein, The stratum stress simulation soil body (2) has the same soil layer structure as the site of the region to be simulated, and each soil layer structure is filled in the stratum simulation device (1) in a layered compaction manner.

3. The pipe jacking simulation apparatus of claim 1, wherein, The stratum simulation unit further comprises a lateral pressure meter (6), the lateral pressure meter (6) obtains the bearing capacity strength and deformation data of the stratum stress simulation soil body (2) based on a probe arranged in the stratum stress simulation soil body (2), and provides data support for accurately simulating the real environment of the stratum stress simulation soil body (2) under the multiple stratum stress coupling under different overburden loads at the construction site in a zoned and layered manner.

4. The pipe jacking simulation apparatus of claim 1, wherein, The pipe jacking simulation unit further comprises a laser positioning monitoring device (14), and the pipe jacking cutting drill (12) completes the deviation correction of the tunneling direction based on the laser line of the laser positioning monitoring device (14).

5. The pipe jacking simulation apparatus of claim 4, wherein, The rear end of the pipe jacking cutting drill (12) is provided with a ball rotation device (15) for adjusting the direction of tunneling, The pipe jacking cutting drill (12) comprises a rotation disc and a rotation motor, the rotation disc is provided with a cutting tip (13), an unearthing hole and a pressure stress sensor (10) for monitoring the earth pressure and jacking pressure in the jacking tunneling process, and the bottom end of the rotation disc is connected with the ball rotation device (15).

6. The pipe jacking simulation apparatus of claim 5, wherein, The rear end of the pipe jacking cutting drill (12) is further provided with a spiral unearthing machine (16) for realizing the transmission of the soil body and an unearthing box (17) for containing the soil body.

7. The pipe jacking simulation apparatus of claim 1, wherein, The pressure stress sensor (10) is also arranged on the side wall of the water supply pipe section (21), when the water supply pipe section (21) is installed, the water pressure is applied to the inside of the pipe through the water pump (22), the sealing property of the water supply pipe section (21) is ensured, there is no water leakage, the pipe wall pressure and strain data of the water supply pipe section (21) are collected, and the stress data in the stratum stress simulation soil body (2) are collected.

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