Advanced roadway surrounding rock displacement monitoring system and method

Abstract

The invention provides an advanced roadway surrounding rock displacement monitoring system which comprises a plurality of radiation source advanced drill holes formed in surrounding rock in front of a roadway tunneling working face, and four radar advanced drill holes formed beside the plurality of radiation source advanced drill holes. The radiation source unit comprises a plurality of target bodies, a plurality of constant temperature resistors, a plurality of external wires and a power supply temperature control all-in-one machine, and the radar positioning unit comprises a central station radar, a 1 # auxiliary station radar, a 2 # auxiliary station radar and a 3 # auxiliary station radar; and the digital display unit comprises an external port, a data processing and storage module, a display screen, a data transmission interface and a power supply. The invention also provides an advanced roadway surrounding rock displacement monitoring method. According to the invention, the plurality of target bodies and the passive distributed radar system are buried in the surrounding rock of the roadway, the heating target bodies are used as radiation sources, and the passive distributed radar system receives electromagnetic wave signals of the radiation sources, so that the continuous monitoring of the displacement of each target body buried in the surrounding rock of the roadway in a three-dimensional space can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering tunnel excavation and monitoring, and in particular to a system and method for monitoring displacement of surrounding rocks in an advanced tunnel. Background Art

[0002] The fields of municipal engineering, transportation engineering, water conservancy engineering and mining engineering all involve the excavation and support of tunnels or roadways. Whether it is a shallow buried tunnel or a deep underground roadway, the excavation process will disturb the surrounding rock, destroy its stability, and then change the original stress state of the surrounding rock, causing it to deform. In severe cases, it will cause roadway surrounding rock accidents. For this reason, it is necessary to take certain support measures for the surrounding rock of the tunnel or roadway in time to restore its stability as soon as possible. The choice of tunnel or roadway support method is closely related to the deformation, displacement and other change laws of its surrounding rock. Therefore, timely grasping the deformation, displacement and other data of the surrounding rock and their change laws can make scientific judgments on the support, deformation, convergence and stability of the surrounding rock, so as to take reasonable countermeasures, greatly reduce the incidence of surrounding rock accidents and ensure the life safety of construction personnel.

[0003] At present, the devices used for tunnel or roadway surrounding rock displacement are mainly multi-point displacement meters, roof delamination meters, etc. These monitoring instruments are installed in the roadway surrounding rock after the roadway is excavated, that is, these monitoring instruments have a certain "lag", and they all monitor the surrounding rock displacement after the roadway is excavated. It is impossible to achieve continuous monitoring of the surrounding rock displacement before, during and after the roadway excavation, and thus it is impossible to fully grasp the changing law of the surrounding rock displacement before and after the roadway excavation; at the same time, the existing monitoring instruments can only monitor the displacement of the surrounding rock in one direction, while under actual conditions, the displacement of the surrounding rock moves in three-dimensional space. It can be seen that the current related displacement monitoring has certain limitations; in addition, the operating steps of these monitoring instruments during installation are very complicated and the monitoring cost is high. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a system and method for monitoring displacement of surrounding rock in an advanced tunnel.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a system for monitoring displacement of surrounding rock in an advanced tunnel, comprising:

[0006] A plurality of radiation source advance drilling holes are opened in the surrounding rock in front of the tunnel excavation working face, and four radar advance drilling holes are opened next to the plurality of radiation source advance drilling holes;

[0007] The radiation source unit includes a plurality of target bodies, a plurality of constant temperature resistors, a plurality of external wires and a power supply and temperature control integrated machine. A target body is arranged in each radiation source advance drilling hole, and a constant temperature resistor is arranged in each target body. Each constant temperature resistor is connected to the power supply and temperature control integrated machine placed outside the radiation source advance drilling hole through an external wire. The power supply and temperature control integrated machine is used to control the temperature of the constant temperature resistor in each target body. The target body together with the constant temperature resistor is pushed to the bottom of the radiation source advance drilling hole through the radiation source pushing and installing unit.

[0008] The radar positioning unit includes a central station radar, a No. 1 auxiliary station radar, a No. 2 auxiliary station radar and a No. 3 auxiliary station radar; the central station radar, the No. 1 auxiliary station radar, the No. 2 auxiliary station radar and the No. 3 auxiliary station radar are respectively pushed to the bottom of four radar advance boreholes through a radar pushing and installing unit; the No. 1 auxiliary station radar, the No. 2 auxiliary station radar and the No. 3 auxiliary station radar monitor the displacement of multiple target bodies in real time and transmit the data to the central station radar; the central station radar is connected to a data cable, and a data cable plug is provided at the end of the data cable;

[0009] The digital display unit includes an external port, a data processing and storage module, a display screen, a data transmission interface and a power supply, wherein the data line plug is connected to the external port, the data processing and storage module is used to calculate and process the data transmitted by the central station radar, and store the processed data; the display screen is used to display data information; the data transmission interface is used to connect to an external device and transmit the stored data to the external device; the power supply is used to power the data processing and storage module and the display screen.

[0010] Furthermore, the target body includes a metal circular shell with a hollow structure inside. A first threaded connection hole is opened on the metal circular shell, and a wire threading hole is opened next to the first threaded connection hole. The constant temperature resistor is fixed inside the metal circular shell, and the external wire on the constant temperature resistor passes through the wire threading hole.

[0011] Furthermore, the power supply and temperature control integrated machine includes a shell, a battery, a temperature controller, a temperature adjustment knob and a switch. The shell is provided with a battery and a temperature controller, and the shell is provided with a temperature adjustment knob and a switch. The temperature adjustment knob is connected to the temperature controller. The shell is also provided with a plurality of external connection holes. The external wires on the constant temperature resistor in each target body are respectively connected to the battery through the external connection holes. The battery and the temperature controller are also connected separately, the temperature adjustment knob is connected to the temperature controller, and the switch is connected to the power supply.

[0012] Furthermore, the central station radar comprises a first shuttle-shaped shell, a central station radar body is fixed in the first shuttle-shaped shell, a second threaded connection hole is opened at the end of the first shuttle-shaped shell, the central station radar body is connected to the data line, and the data line passes through the second threaded connection hole;

[0013] The 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar have the same structure and all include a second shuttle-shaped shell, in which the auxiliary station radar body is fixed, and a third threaded connection hole is opened at the end of the second shuttle-shaped shell.

[0014] Furthermore, the radiation source pushing and installing unit comprises a plurality of solid connecting rods, a polyurethane sealing part, a grouting pipe and a grouting pump. After the plurality of solid connecting rods are threadedly connected in sequence, the first solid connecting rod is connected to the target body, and the target body is pushed to the bottom of the radiation source advance drilling hole. A polyurethane sealing part is formed by sealing the hole at the mouth of the radiation source advance drilling hole. The front end of the grouting pipe passes through the polyurethane sealing part and is placed inside the radiation source advance drilling hole. The end of the grouting pipe is connected to the grouting pump, and the cement mortar is injected into the radiation source advance drilling hole through the grouting pipe by the grouting pump.

[0015] Furthermore, the radar pushing and installation unit includes a high-pressure expansion capsule sealer, multiple hollow connecting rods, a manual pressure pump, a high-pressure liquid injection pipe and a pressure relief device. The multiple hollow connecting rods are connected in sequence by threads. The front end of the high-pressure expansion capsule sealer is threadedly connected to the central station radar, 1# auxiliary station radar, 2# auxiliary station radar or 3# auxiliary station radar. The end of the high-pressure expansion capsule sealer is threadedly connected to the first hollow connecting rod. The end of the high-pressure expansion capsule sealer is also connected to one end of the high-pressure liquid injection pipe. The other end of the high-pressure liquid injection pipe is connected to the pressure relief device, and the pressure relief device is connected to the manual pressure pump.

[0016] Furthermore, the high-pressure expansion capsule sealer includes a central tube and an expansion capsule, the central tube is a cylindrical tube body with closed ends and a cavity inside, the tube wall of the central tube is a double-layer structure, including an inner tube wall and an outer tube wall, the inner tube wall and the outer tube wall are hollow structures, and the outer tube wall is axially provided with a plurality of liquid outlet holes, the expansion capsule is wrapped on the outer peripheral surface of the outer tube wall, and a first connecting tube and a second connecting tube are axially provided at the center of the left end surface and the right end surface of the central tube respectively, the interiors of the first connecting tube and the second connecting tube are both hollow structures, and through holes are respectively provided on the left end surface and the right end surface of the central tube at positions corresponding to the first connecting tube and the second connecting tube, the first connecting tube and the second connecting tube are connected to the internal cavity of the central tube through the through holes, and threaded connecting sections are respectively provided on the first connecting tube and the second connecting tube, and a liquid inlet hole is provided on the right end surface of the central tube between the inner tube wall and the outer tube wall, and the liquid inlet hole is used to connect with the high-pressure injection tube.

[0017] Furthermore, a wire hole is provided on the second connecting tube. The data cable and data cable plug connected to the central station radar body pass through the first connecting tube, the internal cavity of the central tube, and the second connecting tube in sequence, and finally pass through the wire hole and pass through the radar pre-drilling hole, and then the data cable plug is connected to the digital display unit.

[0018] The present invention also provides a method for monitoring displacement of surrounding rock in an advanced tunnel, which is implemented by using the above-mentioned monitoring system for displacement of surrounding rock in an advanced tunnel, and specifically comprises the following steps:

[0019] S1, monitoring scheme design: design the number of targets in the radiation source unit, the layout of each target, and the layout of the central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar in the radar positioning unit according to the current status of the tunnel excavation working face;

[0020] S2, advance drilling construction: radiation source advance drilling and radar advance drilling construction. According to the above design parameters, the radiation source advance drilling and radar advance drilling are constructed on the side of the tunnel along the tunnel excavation working face in the excavation direction. The drilling depth is determined according to the specific layout position of the designed target body and radar positioning unit. In the drilling process, different rock layers are cored and processed into rock samples.

[0021] S3, laboratory experiment: the processed rock samples are placed in a constant temperature box in the laboratory to keep its temperature the same as the surrounding rock temperature of the tunnel on site, and then a target body with a constant temperature resistor inside is placed in rock samples of different rock formations, and the temperature of the constant temperature resistor is controlled by a power supply temperature controller, and the propagation speed and attenuation rate of thermal radiation generated by the target body in the rock samples of different rock formations under different temperature conditions are measured; wherein the temperatures are set to 30°C, 40°C, 50°C, 60°C, 70°C, 80°C and 90°C respectively;

[0022] Conduct 3-5 measurements on the rock samples of each rock layer, and compare and analyze the measurement results to determine the temperature value of the thermal radiation generated by the target body at the optimal propagation speed and attenuation rate;

[0023] S4, radiation source unit and radar positioning unit installation:

[0024] Each target body is pushed to the bottom of the radiation source advance drilling hole through the radiation source pushing installation unit, and a polyurethane sealing part is formed at the opening of each radiation source advance drilling hole through polyurethane sealing, and the front end of the grouting pipe is passed through the polyurethane sealing part and placed inside the radiation source advance drilling hole, and the end of the grouting pipe is connected to the grouting pump, and the cement mortar is injected into the radiation source advance drilling hole through the grouting pipe by the grouting pump;

[0025] The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are pushed to the bottom of the radar advance borehole through the radar pushing and installing unit respectively, and the manual pressure pump is turned on to input high-pressure liquid into the expansion capsule sealer to expand the expansion capsule to seal the hole;

[0026] S5, system trial operation: connect the external wiring of each target body to the power supply temperature control integrated machine, and adjust the temperature value of the constant temperature resistor according to the actual surrounding rock temperature on site through the power supply temperature control integrated machine according to the surrounding rock temperature outside each target body;

[0027] Connect the central station radar to the data cable, and connect the data cable plug at the end of the data cable to the external port of the digital display unit to monitor and view the position of each target body;

[0028] S6, surrounding rock displacement monitoring: As the tunnel is continuously excavated, the target bodies inside the tunnel surrounding rock will be displaced with the changes of the tunnel surrounding rock, and will be monitored by the 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar to obtain displacement data and store it in the digital display unit;

[0029] According to the actual needs on site, when the tunnel excavation working surface exceeds each target body and when the displacement data of each target body no longer changes, the monitoring can be ended;

[0030] S7, device recovery:

[0031] After the monitoring is completed, the digital display unit is first removed and preserved so that it can be brought to the ground and its internal data is connected to the external device through the data transmission interface, and the data is imported into the external device for analysis; then each radar push installation unit is depressurized and the central station radar, 1# sub-station radar, 2# sub-station radar and 3# sub-station radar are gradually taken out, and the radar advance drilling holes are sealed after taking them out; at the same time, the power supply and temperature control integrated machine is recycled for next use.

[0032] Furthermore, in step S1, the number of target bodies of the radiation source unit is 9, which are arranged in the surrounding rock on the right side of the tunnel and the surrounding rock on the roof to monitor the displacement of the surrounding rock on the right side of the tunnel and the surrounding rock on the roof. The specific arrangement positions are:

[0033] There are 5 targets arranged in a “I” shape on the right side of L9 in front of the tunnel excavation working face, L9 = 5m-8m, the distance between each target is L2, L2 = 0.5m-1.0m, the height of each target from the tunnel floor is L8, L8 = 0.5m-2.0m, the first target located on the right side of the right side of the tunnel, its distance from the right side of the tunnel is L1, L1 = 0.5m-2.0m;

[0034] At the same time, at a distance of L9 in front of the tunnel excavation working face, four target bodies are arranged vertically upward along the center of the tunnel excavation working face, and the distance between each target body is L4, L4 = 1.0m-2.0m.

[0035] The first target body located above the arched roof of the tunnel has a distance from the highest point of the arched roof of the tunnel of L3, L3 = 0.5m-2.0m;

[0036] The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar in the radar positioning unit are arranged in an inverted "Y" shape on the right side of the five targets. The heights of 1# auxiliary station radar and 2# auxiliary station radar are equal, and the height from the tunnel floor is equal to the height L8 of the five targets. The distance between 1# auxiliary station radar and 2# auxiliary station radar is L 12 , L 12 =2.0m-5.0m, the central station radar and the 3# auxiliary station radar are located above the center of the line connecting the 1# auxiliary station radar and the 2# auxiliary station radar in sequence, the distance between the central station radar and the 1# auxiliary station radar and the 2# auxiliary station radar is L6, L6=1.0m-5.0m, the distance between the 3# auxiliary station radar and the central station radar is L7, L7=0.5m-4.0m, the extension line of the connection line of the five targets intersects and is perpendicular to the center of the connection line between the 1# auxiliary station radar and the 2# auxiliary station radar; the distance between the connection line between the 1# auxiliary station radar and the 2# auxiliary station radar and the last target located on the right side of the right side of the lane is L5, L5=2m-3m;

[0037] In step S2, the radiation sources placed in the five target bodies arranged in the surrounding rock on the right side of the tunnel have the same advanced drilling positions and are located at a distance of L from the tunnel excavation working face. 10 The radiation sources of the four targets arranged in the surrounding rock of the arched roof of the tunnel have the same advanced drilling opening positions and are located at a distance of L from the tunnel excavation working face. 10 At the center of the arched roof of the rear tunnel, L 10 =5m-8m;

[0038] The radar advance drilling opening positions of the central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are located on the right side of the tunnel, and are located L behind the radiation source advance drilling opening positions of the five target bodies in the surrounding rock on the right side of the tunnel. 11 In the range, L 11 =1.0m-3.0m.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The present invention utilizes multiple targets buried in the tunnel surrounding rock and a passive distributed radar system, and utilizes the heat-generating target as a radiation source. The passive distributed radar system receives the electromagnetic wave signal of the radiation source and adopts the four-station three-coordinate positioning principle to realize continuous monitoring of the displacement of each target buried in the tunnel surrounding rock in three-dimensional space;

[0041] 2. The present invention arranges multiple radiation source advance boreholes on the advance excavation working face, and opens four radar advance boreholes next to the radiation source advance boreholes, pushes and installs target bodies in the radiation source advance boreholes, and the target bodies are arranged in a "one" shape. The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are pushed and installed in the four radar advance boreholes, and the central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are arranged in an inverted "Y" shape, and the temperature of each target body is controlled by a power supply temperature control integrated machine, the displacement of each target body is monitored by a radar positioning unit, and the monitoring data is acquired and displayed in real time by a digital display device, so as to realize continuous monitoring of the internal displacement of the surrounding rock before and after the tunnel excavation;

[0042] 3. The monitoring equipment such as the digital display unit and the power supply temperature control integrated machine involved in the present invention can be recycled and reused, so the overall monitoring cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the arrangement structure of the radiation source advance drilling, radar advance drilling, various target bodies and radar positioning unit in the advance tunnel surrounding rock displacement monitoring system in the first embodiment of the present invention;

[0044] Figure 2 for Figure 1 A top view of

[0045] Figure 3 for Figure 1 Left view of;

[0046] Figure 4 This is a schematic diagram of the connection between a target body in the radiation source unit in Example 1 and the power supply and temperature control integrated machine through an external connection;

[0047] Figure 5 It is a schematic diagram of the structure of the central station radar in Example 1;

[0048] Figure 6 It is a schematic diagram of the structure of the 1# auxiliary station radar, the 2# auxiliary station radar and the 3# auxiliary station radar in the first embodiment;

[0049] Figure 7 This is a connection diagram for pushing the target body and sealing the hole in the first embodiment of the present invention;

[0050] Figure 8 This is a connection diagram of the target body after the hole is sealed in the first embodiment of the present invention;

[0051] Fig. 9 This is a connection diagram of the central station during mine pushing and hole sealing in the first embodiment of the present invention;

[0052] Fig.10 This is a connection diagram of the central station radar after sealing in the first embodiment of the present invention;

[0053] Fig.11 This is a connection diagram of the 1# secondary station radar push and hole sealing in the first embodiment of the present invention;

[0054] Fig.12 This is a connection diagram of the radar of the No. 1 secondary station after sealing in the first embodiment of the present invention;

[0055] Fig.13 This is a principle block diagram of a digital display unit in Embodiment 1 of the present invention;

[0056] Fig.14 This is a schematic diagram of the structure of the high-pressure expansion capsule sealer in the first embodiment of the present invention;

[0057] Fig.15 It is a structural schematic diagram of a high-pressure expansion capsule sealer connected to a central station radar in Embodiment 1 of the present invention;

[0058] Fig.16 Schematic diagram of the liquid inlet hole of the high-pressure expansion capsule sealing device in the first embodiment of the present invention;

[0059] Fig.17 for Fig.14 AA section structure schematic diagram;

[0060] Fig.18 The flowchart is a method for monitoring displacement of surrounding rock in an advanced tunnel according to the second embodiment of the present invention.

[0061] Markings in the figure: 1. Radiation source advance drilling; 2. Radar advance drilling; 3. Target body; 31. Metal circular shell; 32. First threaded connection hole; 33. Threading hole; 4. Constant temperature resistor; 5. External connection; 6. Power supply and temperature control integrated machine; 61. Shell; 62. Battery; 63. Temperature controller; 64. Temperature adjustment knob; 65. Switch; 66. External connection hole;

[0062] 7. Central station radar; 71. First shuttle-shaped housing; 72. Central station radar body; 73. Second threaded connection hole;

[0063] 8. 1# auxiliary station radar; 9. 2# auxiliary station radar; 10. 3# auxiliary station radar; 101. second shuttle-shaped housing; 102. auxiliary station radar body; 103. third threaded connection hole;

[0064] 11. Data cable; 12. Data cable plug;

[0065] 13. Digital display unit; 131. External port; 132. Data processing and storage module; 133. Display screen; 134. Data transmission interface; 135. Power supply;

[0066] 14. Solid connecting rod; 15. Polyurethane sealing part; 16. Grouting pipe; 17. Grouting pump; 18. High-pressure expansion capsule sealer; 181. Central pipe; 1811. Inner pipe wall; 1812. Outer pipe wall; 182. Expansion capsule; 183. First connecting pipe; 184. Second connecting pipe; 185. Threaded connecting section; 186. Wire hole; 187. Liquid outlet hole; 188. Liquid inlet hole;

[0067] 19. Hollow connecting rod; 20. Manual pressure pump; 21. High-pressure injection pipe; 22. Pressure relief device; 23. Cement mortar;

[0068] 100. Tunnel excavation working face; 200. Tunnel right wall; 300. Tunnel arched roof; 400. Tunnel bottom plate. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] Embodiment 1

[0071] Reference Figure 1-Figure 7 , a monitoring system for surrounding rock displacement of an advanced tunnel, comprising:

[0072] A plurality of radiation source advance boreholes 1 are opened in the surrounding rock in front of the tunnel excavation working face 100, and four radar advance boreholes 2 are opened next to the plurality of radiation source advance boreholes 1;

[0073] The radiation source unit includes a plurality of target bodies 3, a plurality of constant temperature resistors 4, a plurality of external wires 5 and a power supply temperature control integrated machine 6. A target body 3 is provided in each radiation source advance drilling hole 1. A constant temperature resistor 4 is provided in each target body 3. Each constant temperature resistor 4 is connected to the power supply temperature control integrated machine 6 disposed outside the radiation source advance drilling hole 1 through an external wire 5. The power supply temperature control integrated machine 6 is used to control the temperature of the constant temperature resistor 4 in each target body 3. The target body 3 together with the constant temperature resistor 4 is pushed to the bottom of the radiation source advance drilling hole 1 through the radiation source pushing and installing unit.

[0074] The radar positioning unit includes a central station radar 7, a No. 1 auxiliary station radar 8, a No. 2 auxiliary station radar 9 and a No. 3 auxiliary station radar 10; the central station radar 7, the No. 1 auxiliary station radar 8, the No. 2 auxiliary station radar 9 and the No. 3 auxiliary station radar 10 are respectively pushed to the bottom of four radar advance boreholes 2 through radar pushing and installing units; the central station radar 7, the No. 1 auxiliary station radar 8, the No. 2 auxiliary station radar 9 and the No. 3 auxiliary station radar 10 constitute a passive distributed radar system, the central station radar 7 is connected to a data line 11, and a data line plug 12 is provided at the end of the data line 11;

[0075] The passive distributed radar system adopts 4-station (3 coordinates) arrival time difference positioning technology to obtain the position coordinates of each target body 3, wherein the coordinates of the central station are (0, 0, 0), and the coordinates of the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 are determined according to the actual position. The heated target bodies 3 are used as radiation sources to emit electromagnetic wave signals. The 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 receive the electromagnetic wave signals of each target body 3, and after preprocessing, transmit them to the central station radar 7 for data fusion analysis. By respectively calculating the time difference between the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 and the central station radar 7 receiving the signals of each target body 3, the position coordinates of each target body 3 can be obtained, and the target body 3 is positioned;

[0076] Reference Fig.13 The digital display unit 13 includes an external port 131, a data processing and storage module 132, a display screen 133, a data transmission interface 134 and a power supply 135, wherein the data line plug 12 is connected to the external port 131, the data processing and storage module 132 is used to calculate and process the data transmitted by the central station radar 7, and store the processed data; the display screen 133 is used to display data information; the data transmission interface 134 is used to connect to an external device and transmit the stored data to the external device; the power supply 135 is used to power the data processing and storage module 132 and the display screen 133. The external device is a laptop computer, a mobile phone, etc.

[0077] The data transmission interface 134 is a USB interface.

[0078] Reference Figure 4 The target body 3 includes a metal circular shell 31, which has a hollow structure inside. A first threaded connection hole 32 is opened on the metal circular shell 31, and a threading hole 33 is opened next to the first threaded connection hole 32. The constant temperature resistor 4 is fixed inside the metal circular shell 31, and the external wire 5 on the constant temperature resistor 4 passes through the threading hole 33.

[0079] The power supply temperature control integrated machine 6 includes a housing 61, a battery 62, a temperature controller 63, a temperature adjustment knob 64 and a switch 65. The housing 61 is provided with a battery 62 and a temperature controller 63. The housing 61 is provided with a temperature adjustment knob 64 and a switch 65. The temperature adjustment knob 64 is connected to the temperature controller 63. The housing 61 is also provided with a plurality of external connection holes 66. The external connection wires 5 on the constant temperature resistor 4 in each target body 3 are respectively connected to the battery 62 through the external connection holes 66. The battery 62 and the temperature controller 63 are connected separately. The temperature adjustment knob 64 is connected to the temperature controller 63. The switch 65 is connected to the battery 62. The battery 62 is a mining intrinsically safe battery. The temperature range of the temperature adjustment knob 64 is 30°C, 40°C, 50°C, 60°C, 70°C, 80°C and 90°C. Rotating the temperature adjustment knob 64 can control the constant temperature resistor 4 to heat to the temperature value of the above-mentioned range through the temperature controller 63.

[0080] Reference Figure 5 The central station radar 7 includes a first shuttle-shaped shell 71, a central station radar body 72 is fixed in the first shuttle-shaped shell 71, a second threaded connection hole 73 is opened at the end of the first shuttle-shaped shell 71, the central station radar body 72 is connected to the data line 11, and the data line 11 passes through the second threaded connection hole 73;

[0081] Reference Figure 6 The 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 have the same structure, and all include a second shuttle-shaped housing 101, in which a secondary station radar body 102 is fixed, and a third threaded connection hole 103 is provided at the end of the second shuttle-shaped housing 101. The second threaded connection hole 73 and the third threaded connection hole 103 are used to connect with the high-pressure expansion capsule hole sealer 18.

[0082] The first shuttle-shaped housing 71 and the second shuttle-shaped housing 101 have the same appearance, both of which are shuttle-shaped structures, so as to facilitate their movement in the drilled hole, and are made of wear-resistant and flame-retardant materials.

[0083] Reference Figure 7-Figure 8 The radiation source pushing installation unit includes multiple solid connecting rods 14, a polyurethane sealing part 15, a grouting pipe 16 and a grouting pump 17. After the multiple solid connecting rods 14 are threadedly connected in sequence, the first solid connecting rod 14 is connected to the target body 3, and the target body 3 is pushed to the bottom of the radiation source advance drilling hole 1. The polyurethane sealing part 15 is formed by sealing the hole mouth of the radiation source advance drilling hole 1 through polyurethane. The front end of the grouting pipe 16 passes through the polyurethane sealing part 15 and is placed in the radiation source advance drilling hole 1. The end of the grouting pipe 16 is connected to the grouting pump 17, and the cement mortar 23 is injected into the radiation source advance drilling hole 1 through the grouting pipe 16 through the grouting pump 17.

[0084] Reference Figure 9-12The radar pushing and installing unit comprises a high-pressure expansion capsule sealer 18, a plurality of hollow connecting rods 19, a manual pressure pump 20, a high-pressure liquid injection pipe 21 and a pressure relief device 22. The plurality of hollow connecting rods 19 are connected in sequence by threads. The front end of the high-pressure expansion capsule sealer 18 is connected by threads to the central station radar 7, the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 or the 3# auxiliary station radar 10. The end of the high-pressure expansion capsule sealer 18 is connected by threads to the first hollow connecting rod 19. The end of the high-pressure expansion capsule sealer 18 is also connected to one end of the high-pressure liquid injection pipe 21. The other end of the high-pressure liquid injection pipe 21 is connected to the pressure relief device 22. The pressure relief device 22 is connected to the manual pressure pump 20.

[0085] The length of the solid connecting rod 14 and the hollow connecting rod 19 are both 1.0m, the diameter is 20mm-30mm, and they are made of strong plastic material. When pushing, the number of the solid connecting rod 14 and the hollow connecting rod 19 is selected according to the depth of the radiation source advance drilling hole 1 and the radar advance drilling hole 2.

[0086] Reference Figure 14-17 The high-pressure expansion capsule sealer 18 includes a central tube 181 and an expansion capsule 182. The central tube 181 is a cylindrical tube body with closed ends and a cavity inside. The tube wall of the central tube 181 is a double-layer structure, including an inner tube wall 1811 and an outer tube wall 1812. There is a hollow structure between the inner tube wall 1811 and the outer tube wall 1812, and a plurality of liquid outlet holes 187 are axially opened on the outer tube wall 1812. The expansion capsule 182 is wrapped on the outer peripheral surface of the outer tube wall 1812. A first connecting tube 183 and a second connecting tube 184 are axially arranged at the center of the left end face and the right end face of the central tube 181, respectively. The interiors of the first connecting tube 183 and the second connecting tube 184 are both hollow structures. At the corresponding position of the second connecting tube 184, through holes are respectively provided on the left and right end faces of the central tube 181, the first connecting tube 183 and the second connecting tube 184 are connected to the internal cavity of the central tube 181 through the through holes, and threaded connecting sections 185 are respectively provided on the first connecting tube 183 and the second connecting tube 184, and a liquid inlet hole 188 is provided at a position between the inner tube wall 1811 and the outer tube wall 1812 on the right end face of the central tube 181, and the liquid inlet hole 188 is used to connect with the high-pressure injection tube 21, and the liquid in the high-pressure injection tube 21 flows into the space between the inner tube wall 1811 and the outer tube wall 1812 through the liquid inlet hole 188, and flows out through multiple liquid outlet holes 187, so that the expansion capsule 182 expands to seal the radar advance drilling hole 2.

[0087] Different from the high-pressure expansion capsule sealer 18 for fixing the No. 1 auxiliary station radar 8, the No. 2 auxiliary station radar 9 or the No. 3 auxiliary station radar 10, in the high-pressure expansion capsule sealer 18 for fixing the central station radar body 72, a wire hole 186 is also provided on the second connecting tube 184. The data cable 11 and the data cable plug 12 connected to the central station radar body 72 pass through the first connecting tube 183 and the internal cavity of the central tube 181 in turn, and finally pass through the wire hole 186 on the second connecting tube 184. After passing through the radar advance drilling 2, the data cable plug 12 is connected to the digital display unit 13.

[0088] The overall length of the high-pressure expansion capsule sealer 18 is 30cm-50cm, and its function is to fix the central station radar 7, 1# auxiliary station radar 8, 2# auxiliary station radar 9 and 3# auxiliary station radar 10 to prevent them from moving in the radar advance drilling 2.

[0089] Embodiment 2

[0090] Reference Figure 1-Figure 18 A method for monitoring displacement of surrounding rock in an advanced tunnel is implemented by using the system for monitoring displacement of surrounding rock in an advanced tunnel described in the first embodiment, and specifically comprises the following steps:

[0091] S1, monitoring scheme design: according to the current status of the tunnel excavation working face 100, the number of target bodies 3 in the radiation source unit, the layout position of each target body 3, and the layout position of the central station radar 7, 1# auxiliary station radar 8, 2# auxiliary station radar 9 and 3# auxiliary station radar 10 in the radar positioning unit are designed; the target body 3 can be arranged in the right side, left side, top plate and bottom plate rock layer of the tunnel as needed, and the central station radar 7, 1# auxiliary station radar 8, 2# auxiliary station radar 9 and 3# auxiliary station radar 10 of the radar positioning unit should be arranged in the surrounding rock on the right side or left side of the tunnel;

[0092] In this embodiment, the number of target bodies 3 of the radiation source unit is 9, which are arranged in the surrounding rock on the right side of the tunnel and the surrounding rock on the roof, and are used to monitor the displacement of the surrounding rock on the right side of the tunnel and the surrounding rock on the roof. The specific arrangement positions are:

[0093] There are five target bodies 3 arranged in a straight line on the right side of the tunnel excavation working face 100 at a distance of L9, L9 = 5m-8m, the distance between each target body 3 is L2, L2 = 0.5m-1.0m, the height of each target body 3 from the tunnel bottom plate 400 is L8, L8 = 0.5m-2.0m, the first target body 3 located on the right side of the tunnel right wall 200, its distance from the tunnel right wall 200 is L1, L1 = 0.5m-2.0m;

[0094] At the same time, at a distance L9 in front of the tunnel excavation working face 100, four target bodies 3 are arranged vertically upward along the center position of the tunnel excavation working face 100, and the distance between each target body 3 is L4, L4 = 1.0m-2.0m;

[0095] The first target body 3 located above the tunnel arched roof 300 has a distance L3 from the highest point of the tunnel arched roof 300, where L3 = 0.5 m - 2.0 m;

[0096] The central station radar 7, 1# auxiliary station radar 8, 2# auxiliary station radar 9 and 3# auxiliary station radar 10 in the radar positioning unit are arranged in an inverted "Y" shape on the right side of the five target bodies 3. The heights of the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9 are equal, and the height of 400 from the bottom plate of the tunnel is equal to the height L8 of the five target bodies 3. The distance between the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9 is L 12 , L 12 =2.0m-5.0m, the central station radar 7 and the 3# auxiliary station radar 10 are located above the center of the line connecting the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9 in sequence, the distance between the central station radar 7 and the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9 is L6, L6=1.0m-5.0m, the distance between the 3# auxiliary station radar 10 and the central station radar 7 is L7, L7=0.5m-4.0m, the extension line of the connection line of the five target bodies 3 intersects and is perpendicular to the center of the connection line of the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9; the distance between the connection line of the 1# auxiliary station radar 8 and the 2# auxiliary station radar 9 and the last target body 3 located on the right side of the right side 200 of the lane is L5, L5=2m-3m.

[0097] S2, advance drilling construction: radiation source advance drilling 1 and radar advance drilling 2 are constructed. According to the above design parameters, a drilling rig is used to construct radiation source advance drilling 1 and radar advance drilling 2 on the side of the tunnel along the tunnel excavation working face 100 in the excavation direction. The diameter of the boreholes is 75 mm. The depth of the boreholes is determined according to the specific arrangement positions of the designed target body 3 and the central station radar 7, 1# auxiliary station radar 8, 2# auxiliary station radar 9 and 3# auxiliary station radar 10. In addition, different rock layers are cored during the drilling process and processed into rock samples. At the same time, in order to prevent deviation during the drilling construction process, anti-deviation measures should be taken (such as installing a drilling measuring instrument);

[0098] The radiation source advance drilling holes 1 of the five target bodies 3 arranged in the surrounding rock on the right side of the tunnel have the same opening position and are located 100L away from the tunnel excavation working face. 10 The rear tunnel right side 200; the radiation source 3 placed in the tunnel arched roof 300 surrounding rock 4 target bodies 3 ahead of the drilling 1 opening position is the same, and is located at a distance of 100L from the tunnel excavation working face 10 At the center of the rear tunnel arched roof 300, L10 =5m-8m;

[0099] The opening position of the radar advance drilling hole 2 released by the central station radar 7, the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 is located on the right side of the tunnel 200, and is located L behind the opening position of the radiation source advance drilling hole 1 released by the 5 surrounding rock target bodies 3 on the right side of the tunnel. 11 In the range, L 11 =1.0m-3.0m;

[0100] S3, laboratory experiment: the processed rock sample is placed in a laboratory constant temperature box to keep its temperature the same as the surrounding rock temperature of the on-site tunnel, and then the target body 3 with a constant temperature resistor 4 inside is placed in rock samples of different rock formations, and the temperature of the constant temperature resistor 4 is controlled by the power supply temperature control integrated machine 6, and the propagation speed and attenuation rate of the thermal radiation (electromagnetic wave) generated by the target body 3 in the rock samples of different rock formations under different temperature conditions are measured; wherein the temperatures are set to 30°C, 40°C, 50°C, 60°C, 70°C, 80°C and 90°C respectively;

[0101] The rock samples of each rock layer are measured 3-5 times, and the measurement results are compared and analyzed to determine the temperature value of the thermal radiation generated by the target body 3 at the optimal propagation speed and attenuation rate;

[0102] S4, installation of each target and radar positioning unit:

[0103] Each target body 3 is pushed to the bottom of the radiation source advance drilling hole 1 through the radiation source pushing installation unit, and a polyurethane sealing portion 15 is formed at the opening of each radiation source advance drilling hole 1 through polyurethane sealing, and the front end of the grouting pipe 16 is passed through the polyurethane sealing portion 15 and placed inside the radiation source advance drilling hole 1, and the end of the grouting pipe 16 is connected to the grouting pump 17, and the cement mortar 23 is injected into the radiation source advance drilling hole 1 through the grouting pipe 16 through the grouting pump 17;

[0104] The central station radar 7, the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10 are respectively pushed to the bottom of the radar advance borehole 2 through the radar pushing and installing unit, and the manual pressure pump 20 is turned on to input high-pressure liquid into the high-pressure expansion capsule sealer 18 to expand the expansion capsule 182 to seal the hole;

[0105] S5, system trial operation: connect the external wire 5 of each target body 3 to the power supply and temperature control integrated machine 6, and control the constant temperature resistor 4 in each target body 3 to heat to the temperature value determined in step S3 through the power supply and temperature control integrated machine 6;

[0106] Connect the central station radar 7 to the data line 11, connect the data line plug 12 at the end of the data line 11 to the external port 131 of the digital display unit 13, monitor and check the position of each target body 3, and compare and analyze it with the layout position designed in step S1 to check its error range, which shall not exceed 5mm; if the layout position exceeds the error range, correct the positioning system to make it within the allowable error range;

[0107] S6, surrounding rock displacement monitoring: as the tunnel is continuously excavated, each target body 3 inside the tunnel surrounding rock will be displaced as the tunnel surrounding rock changes, and will be monitored by the 1# auxiliary station radar 8, the 2# auxiliary station radar 9 and the 3# auxiliary station radar 10, and the displacement data will be obtained and stored in the digital display unit 13;

[0108] According to the actual needs on site, when the tunnel excavation working face 100 exceeds each target body 3 and when the displacement data of each target body 3 no longer changes, the monitoring can be ended;

[0109] S7, device recovery:

[0110] After the monitoring is completed, the digital display unit 13 is first removed and preserved so that it can be brought to the ground and its internal data is connected to the external device through the data transmission interface 134, and the data is imported into the external device (laptop computer, mobile phone) for analysis; then each radar push installation unit is depressurized and the central station radar 7, 1# sub-station radar 8, 2# sub-station radar 9 and 3# sub-station radar 10 are gradually taken out, and the radar advance drilling 2 is sealed after taking them out; at the same time, the power supply and temperature control integrated machine 6 is recycled for next use.

[0111] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A monitoring system for surrounding rock displacement in an advanced tunnel, characterized in that: include: A plurality of radiation source advance drilling holes are opened in the surrounding rock in front of the tunnel excavation working face, and four radar advance drilling holes are opened next to the plurality of radiation source advance drilling holes; The radiation source unit includes a plurality of target bodies, a plurality of constant temperature resistors, a plurality of external wires and a power supply and temperature control integrated machine. A target body is arranged in each radiation source advance drilling hole, and a constant temperature resistor is arranged in each target body. Each constant temperature resistor is connected to the power supply and temperature control integrated machine placed outside the radiation source advance drilling hole through an external wire. The power supply and temperature control integrated machine is used to control the temperature of the constant temperature resistor in each target body. The target body together with the constant temperature resistor is pushed to the bottom of the radiation source advance drilling hole through the radiation source pushing and installing unit. Radar positioning unit, including central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar; The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are pushed to the bottom of the four radar advance boreholes through the radar pushing and installing units respectively; 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar monitor the displacement of multiple target bodies in real time and transmit the data to the central station radar; The central station radar is connected to a data cable, and a data cable plug is provided at the end of the data cable; The digital display unit includes an external port, a data processing and storage module, a display screen, a data transmission interface and a power supply, wherein the data line plug is connected to the external port, the data processing and storage module is used to calculate and process the data transmitted by the central station radar, and store the processed data; the display screen is used to display data information; the data transmission interface is used to connect to an external device and transmit the stored data to the external device; the power supply is used to power the data processing and storage module and the display screen.

2. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 1, characterized in that: The target body includes a metal circular shell with a hollow structure inside. A first threaded connection hole is opened on the metal circular shell, and a threading hole is opened next to the first threaded connection hole. The constant temperature resistor is fixed inside the metal circular shell, and the external wire on the constant temperature resistor passes through the threading hole.

3. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 1, characterized in that: The power supply and temperature control integrated machine includes a shell, a battery, a temperature controller, a temperature adjustment knob and a switch. The shell is provided with a battery and a temperature controller, and the shell is provided with a temperature adjustment knob and a switch. The temperature adjustment knob is connected to the temperature controller. The shell is also provided with a plurality of external connection holes. The external wires on the constant temperature resistor in each target body are respectively connected to the battery through the external connection holes. The battery and the temperature controller are also connected separately, the temperature adjustment knob is connected to the temperature controller, and the switch is connected to the power supply.

4. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 1, characterized in that: The central station radar comprises a first shuttle-shaped shell, a central station radar body is fixed in the first shuttle-shaped shell, a second threaded connection hole is opened at the end of the first shuttle-shaped shell, the central station radar body is connected to the data line, and the data line passes through the second threaded connection hole; The 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar have the same structure and all include a second shuttle-shaped shell, in which the auxiliary station radar body is fixed, and a third threaded connection hole is opened at the end of the second shuttle-shaped shell.

5. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 1, characterized in that: The radiation source pushing installation unit comprises a plurality of solid connecting rods, a polyurethane sealing part, a grouting pipe and a grouting pump. After the plurality of solid connecting rods are threadedly connected in sequence, the first solid connecting rod is connected to the target body, and the target body is pushed to the bottom of the radiation source advance drilling hole. The polyurethane sealing part is formed by sealing the hole at the mouth of the radiation source advance drilling hole. The front end of the grouting pipe passes through the polyurethane sealing part and is placed in the radiation source advance drilling hole. The end of the grouting pipe is connected to the grouting pump, and the cement mortar is injected into the radiation source advance drilling hole through the grouting pipe by the grouting pump.

6. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 1, characterized in that: The radar pushing and installing unit comprises a high-pressure expansion capsule sealer, a plurality of hollow connecting rods, a manual pressure pump, a high-pressure liquid injection pipe and a pressure relief device. The plurality of hollow connecting rods are connected in sequence by threads. The front end of the high-pressure expansion capsule sealer is connected by threads to the central station radar, the 1# auxiliary station radar, the 2# auxiliary station radar or the 3# auxiliary station radar. The end of the high-pressure expansion capsule sealer is connected by threads to the first hollow connecting rod. The end of the high-pressure expansion capsule sealer is also connected to one end of the high-pressure liquid injection pipe. The other end of the high-pressure liquid injection pipe is connected to the pressure relief device. The pressure relief device is connected to the manual pressure pump.

7. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 6, characterized in that: The high-pressure expansion capsule sealer includes a central tube and an expansion capsule, wherein the central tube is a cylindrical tube body with closed ends and a cavity inside, the tube wall of the central tube is a double-layer structure, including an inner tube wall and an outer tube wall, the inner tube wall and the outer tube wall are hollow, and a plurality of liquid outlet holes are axially opened on the outer tube wall, the expansion capsule is wrapped on the outer circumferential surface of the outer tube wall, a first connecting tube and a second connecting tube are axially arranged at the center of the left end face and the right end face of the central tube, the interiors of the first connecting tube and the second connecting tube are both hollow structures, through holes are respectively arranged on the left end face and the right end face of the central tube at positions corresponding to the first connecting tube and the second connecting tube, the first connecting tube and the second connecting tube are connected to the internal cavity of the central tube through the through holes, threaded connecting sections are respectively arranged on the first connecting tube and the second connecting tube, and a liquid inlet hole is arranged at a position between the inner tube wall and the outer tube wall on the right end face of the central tube, and the liquid inlet hole is used to connect with the high-pressure injection tube.

8. The system for monitoring displacement of surrounding rock in an advanced tunnel according to claim 7, characterized in that: A wire hole is also provided on the second connecting tube. The data cable and data cable plug connected to the central station radar body pass through the first connecting tube, the internal cavity of the central tube, and the second connecting tube in sequence, and finally pass through the wire hole and pass through the radar advance drilling. Then, the data cable plug is connected to the digital display unit.

9. A method for monitoring displacement of surrounding rock in an advanced tunnel, implemented by using the system for monitoring displacement of surrounding rock in an advanced tunnel as claimed in any one of claims 1 to 8, characterized in that: The specific steps include: S1, monitoring scheme design: design the number of targets in the radiation source unit, the layout of each target, and the layout of the central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar in the radar positioning unit according to the current status of the tunnel excavation working face; S2, advance drilling construction: radiation source advance drilling and radar advance drilling construction. According to the above design parameters, the radiation source advance drilling and radar advance drilling are constructed on the side of the tunnel along the tunnel excavation working face in the excavation direction. The drilling depth is determined according to the specific layout position of the designed target body and radar positioning unit. In the drilling process, different rock layers are cored and processed into rock samples. S3, laboratory experiment: the processed rock samples are placed in a constant temperature box in the laboratory to keep its temperature the same as the surrounding rock temperature of the tunnel on site, and then a target body with a constant temperature resistor inside is placed in rock samples of different rock formations, and the temperature of the constant temperature resistor is controlled by a power supply temperature controller, and the propagation speed and attenuation rate of thermal radiation generated by the target body in the rock samples of different rock formations under different temperature conditions are measured; wherein the temperatures are set to 30°C, 40°C, 50°C, 60°C, 70°C, 80°C and 90°C respectively; Conduct 3-5 measurements on the rock samples of each rock layer, and compare and analyze the measurement results to determine the temperature value of the thermal radiation generated by the target body at the optimal propagation speed and attenuation rate; S4, radiation source unit and radar positioning unit installation: Each target body is pushed to the bottom of the radiation source advance drilling hole through the radiation source pushing installation unit, and a polyurethane sealing part is formed at the opening of each radiation source advance drilling hole through polyurethane sealing, and the front end of the grouting pipe is passed through the polyurethane sealing part and placed inside the radiation source advance drilling hole, and the end of the grouting pipe is connected to the grouting pump, and the cement mortar is injected into the radiation source advance drilling hole through the grouting pipe by the grouting pump; The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are pushed to the bottom of the radar advance borehole through the radar pushing and installing unit respectively, and the manual pressure pump is turned on to input high-pressure liquid into the expansion capsule sealer to expand the expansion capsule to seal the hole; S5, system trial operation: connect the external wiring of each target body to the power supply temperature control integrated machine, and adjust the temperature value of the constant temperature resistor according to the actual surrounding rock temperature on site through the power supply temperature control integrated machine according to the surrounding rock temperature outside each target body; Connect the central station radar to the data cable, and connect the data cable plug at the end of the data cable to the external port of the digital display unit to monitor and view the position of each target body; S6, surrounding rock displacement monitoring: As the tunnel is continuously excavated, the target bodies inside the tunnel surrounding rock will be displaced with the changes of the tunnel surrounding rock, and will be monitored by the 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar to obtain displacement data and store it in the digital display unit; According to the actual needs on site, when the tunnel excavation working face exceeds each target body and when the displacement data of each target body no longer changes, the monitoring can be ended; S7, device recovery: After the monitoring is completed, the digital display unit is first removed and preserved so that it can be brought to the ground and its internal data is connected to the external device through the data transmission interface, and the data is imported into the external device for analysis; then each radar push installation unit is depressurized and the central station radar, 1# sub-station radar, 2# sub-station radar and 3# sub-station radar are gradually taken out, and the radar advance drilling holes are sealed after taking them out; at the same time, the power supply and temperature control integrated machine is recycled for next use.

10. A method for monitoring displacement of surrounding rock in an advanced tunnel as claimed in claim 9, characterized in that: In step S1, the number of target bodies of the radiation source unit is 9, which are arranged in the surrounding rock on the right side of the tunnel and the surrounding rock on the roof to monitor the displacement of the surrounding rock on the right side of the tunnel and the surrounding rock on the roof. The specific arrangement positions are: There are 5 targets arranged in a "I" shape on the right side of L9 in front of the tunnel excavation working face, L9 = 5m-8m, the distance between each target is L2, L2 = 0.5m-1.0m, the height of each target from the tunnel floor is L8, L8 = 0.5m-2.0m, the first target on the right side of the tunnel right side, its distance from the right side of the tunnel is L1, L1 = 0.5m-2.0m; At the same time, at a distance of L9 in front of the tunnel excavation working face, four target bodies are arranged vertically upward along the center of the tunnel excavation working face, and the distance between each target body is L4, L4 = 1.0m-2.0m. The first target body located above the arched roof of the tunnel has a distance from the highest point of the arched roof of the tunnel of L3, L3 = 0.5m-2.0m; The central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar in the radar positioning unit are arranged in an inverted "Y" shape on the right side of the five targets. The heights of 1# auxiliary station radar and 2# auxiliary station radar are equal, and the height from the tunnel floor is equal to the height L8 of the five targets. The distance between 1# auxiliary station radar and 2# auxiliary station radar is L 12 , L 12 =2.0m-5.0m, the central station radar and the 3# auxiliary station radar are located above the center of the line connecting the 1# auxiliary station radar and the 2# auxiliary station radar in sequence, the distance between the central station radar and the 1# auxiliary station radar and the 2# auxiliary station radar is L6, L6=1.0m-5.0m, the distance between the 3# auxiliary station radar and the central station radar is L7, L7=0.5m-4.0m, the extension line of the connection line of the five targets intersects and is perpendicular to the center of the connection line between the 1# auxiliary station radar and the 2# auxiliary station radar; the distance between the connection line between the 1# auxiliary station radar and the 2# auxiliary station radar and the last target located on the right side of the right side of the lane is L5, L5=2m-3m; In step S2, the radiation sources placed in the five target bodies arranged in the surrounding rock on the right side of the tunnel have the same advanced drilling positions and are located at a distance of L from the tunnel excavation working face. 10 The radiation sources of the four targets arranged in the surrounding rock of the arched roof of the tunnel have the same advanced drilling opening positions and are located at a distance of L from the tunnel excavation working face. 10 At the center of the arched roof of the rear tunnel, L 10 =5m-8m; The radar advance drilling opening positions of the central station radar, 1# auxiliary station radar, 2# auxiliary station radar and 3# auxiliary station radar are located on the right side of the tunnel, and are located L behind the radiation source advance drilling opening positions of the five target bodies in the surrounding rock on the right side of the tunnel. 11 In the range, L 11 =1.0m-3.0m.

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