CN114482150A - Test device for simulating influence and active control of foundation pit excavation adopting supporting servo system on tunnel - Google Patents
Test device for simulating influence and active control of foundation pit excavation adopting supporting servo system on tunnel Download PDFInfo
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- CN114482150A CN114482150A CN202210087667.4A CN202210087667A CN114482150A CN 114482150 A CN114482150 A CN 114482150A CN 202210087667 A CN202210087667 A CN 202210087667A CN 114482150 A CN114482150 A CN 114482150A
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 51
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 87
- 239000002689 soil Substances 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 10
- 238000011160 research Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000011888 foil Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a test device for simulating the influence of foundation pit excavation adopting a supporting servo system on a tunnel and actively controlling the influence, which comprises a model box, a simulated tunnel pipe, a foundation pit structure system, a hydraulic servo system and a measuring system. The model box is filled with soil; the foundation pit structure comprises a simulation support and a simulation diaphragm wall, wherein a plurality of strain gauges are arranged on the outer wall of the periphery of the simulation diaphragm wall, and the simulation support adopts a servo support form; the hydraulic servo system can control the axial force applied to the simulation support; the measuring system is used for acquiring measuring signals of each strain gauge and the infrared ranging device. Through the device, the influence of excavation of a foundation pit adopting the supporting servo system on deformation of the adjacent tunnel can be simulated, and the influence of active control of the servo system on the adjacent deformed tunnel can be researched.
Description
Technical Field
The invention belongs to the technical field of tunnel and underground space engineering, and particularly relates to a test device for simulating influence and active control of foundation pit excavation adopting a supporting servo system on a tunnel.
Background
Along with the rapid development of urban rail transit and urban construction, more and more foundation pit projects are close to underground structures, and foundation pit construction can cause influences on the close-to underground structures, and especially in soft soil areas such as Hangzhou and Shanghai, the influences are more obvious. The tunnel is used as a key protection object, and provides higher control requirements for the deformation of the surrounding environment caused by foundation pit excavation. At present, in order to reduce the influence of foundation pit excavation on an adjacent tunnel, a support servo system is adopted in a plurality of projects. Add the jack of establishing adjustable axial force on traditional support, in time carry out axial force compensation, control foundation ditch deformation and then control and close on the tunnel deformation. However, the research result of the influence of the foundation pit excavation adopting the support servo system on the adjacent tunnel is relatively lacked, and the axial force setting and adjustment of the servo system in the actual engineering are also lacked in scientific guidance.
In the foundation ditch work progress, near the tunnel inevitably can produce the deformation, if the tunnel produces too big deformation, the section of jurisdiction structure suffers destruction, probably produces serious problems such as gushing water and gushing sand, causes huge economic loss, threatens people's life safety even. Therefore, the active control of the support servo system has important significance in the deep research of the deformation recovery of the adjacent tunnel.
In the aspect of indoor models, the existing model tests only analyze the deformation of a foundation pit adopting a supporting servo system or only simulate and research the influence of the foundation pit excavation adopting a traditional supporting mode on a tunnel, and an indoor model test device for the influence of the foundation pit excavation adopting the supporting servo system on the tunnel is not found.
In summary, the research on the influence of the foundation pit excavation using the support servo system on the tunnel has many defects, and it is urgently needed to obtain data information through an indoor model test to further guide the construction and reduce the influence of the foundation pit excavation on the adjacent tunnel.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an indoor simulation test device for simulating the influence of foundation pit excavation adopting a supporting servo system on a tunnel and actively controlling the influence, so that valuable data information is provided for practical engineering, the influence of the foundation pit excavation on an adjacent tunnel is reduced, and optimized construction is guided.
In order to realize the technical purpose, the invention adopts the following technical scheme:
the invention provides a test device for simulating the influence of foundation pit excavation adopting a supporting servo system on a tunnel and actively controlling the influence, which is characterized by comprising a model box, a simulated tunnel pipe, a foundation pit structure system, a hydraulic servo system and a measuring system; the model box is filled with soil; the foundation pit structure system comprises a simulation support and a simulation diaphragm wall, the simulation diaphragm wall is inserted into a soil body, a plurality of strain gauges are arranged on the outer wall of the periphery of the simulation diaphragm wall, and the simulation support is in a servo support form; the hydraulic servo system can control the axial force applied to the simulation support and record the axial force; the measuring system is used for acquiring measuring signals of each strain gauge and the infrared ranging device.
Furthermore, a plurality of simulation supports with different heights are arranged in the foundation pit excavation area from top to bottom. The simulation support is arranged according to the working condition to be simulated.
Furthermore, the hydraulic servo system comprises an electric and monitoring system and a jack, and the simulation support is connected with the jack through a bolt; the jack is connected with an electrical and monitoring system through a lead, and the electrical and monitoring system can adjust and record the axial force on the jack in real time.
Furthermore, the simulation support is arranged on the support platform, the support platform is located in the foundation pit excavation area, and the support platform offsets the gravity of the simulation support and can restrict the lateral movement of the support platform.
Furthermore, the measuring system comprises an automatic data acquisition instrument, a strain gauge connected with the automatic data acquisition instrument, an infrared ranging output system and an infrared ranging device connected with the infrared ranging output system.
Furthermore, the strain gauge and the infrared distance measuring device are fixed at the positions of the arch waist, the arch crown and the arch bottom at two sides of the inner wall of the measuring section.
Furthermore, a plurality of strain gauges are arranged on the outer wall of the periphery of the simulation diaphragm wall, and the strain gauges are connected with an automatic data acquisition instrument.
The invention also discloses a test method for simulating the influence of the foundation pit excavation adopting the support servo system on the tunnel and actively controlling the influence, which comprises the following steps:
1) arrangement test device
Installing an infrared distance measuring device and a strain gauge on the inner wall of a corresponding monitoring section of the simulated tunnel pipe, and respectively connecting the infrared distance measuring output device and the automatic data acquisition instrument through leads; fixing the simulated tunnel pipe at a corresponding position of the model box, and then filling soil into the model box; installing a plurality of strain gauges at corresponding positions of the side wall of the simulated diaphragm wall as required, wherein the strain gauges are connected with an automatic data acquisition instrument; after the installation is finished, inserting the simulation diaphragm wall into the corresponding position in the soil body, and enclosing the simulation diaphragm wall into a simulation foundation pit;
2) after the arrangement is finished, simulation construction is carried out:
2.1) carrying out layered excavation on the simulated foundation pit; when the soil body in the foundation pit is excavated to the corresponding simulation support erection height, stopping excavation, arranging a support platform in the simulation foundation pit and laying simulation supports, wherein one end of each simulation support is in contact with the simulation ground connection wall, and the other end of each simulation support can be connected with a jack through a bolt according to needs and then the jack is in contact with the other simulation ground connection wall, or can be in direct contact with the other simulation ground connection wall; the simulation support frame is arranged on the support platform, and the jack is connected with the electrical and monitoring system; after the installation is finished, the next layer of earthwork excavation is carried out;
2.2) repeating the step 2.1) when the support is excavated to the next simulated support erection height until the bottom of the designed foundation pit is excavated;
2.3 in the excavation process, adjust and record through electric and monitored control system and simulate the axial force on support and the jack, automatic data acquisition appearance and infrared ranging output device record in real time simultaneously and simulate the deformation condition of ground wall and simulation tunnel pipe, and then simulate out the foundation ditch excavation that adopts support servo to influence the tunnel, research servo active control is to the effect that the tunnel warp and resumes.
According to the technical scheme, the invention has the beneficial effects that:
the test device provided by the invention can simulate the influence of foundation pit excavation adopting the support servo system on a tunnel, can effectively simulate actual construction, can provide valuable data basis for adjustment of the axial force of the servo system in the actual construction process so as to provide reference for actual construction and reduce risks; the invention can also research the influence of the servo system active control on the deformation recovery of the tunnel, has the advantages of simple structure, convenient use and the like, and has strong practical value.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of a testing apparatus provided in an embodiment of the present invention;
FIG. 2 is a plan view of a model of a test rig in an embodiment of the invention;
FIG. 3 is a cross-sectional view of a model of a test apparatus in an embodiment of the invention;
FIG. 4 is a schematic view of a monitoring section of a simulated tunnel tube according to an embodiment of the present invention;
description of reference numerals: a mold box 1; a soil body 2; simulating a tunnel pipe 3; a strain gauge 4; a wire 5; an automatic data acquisition instrument 6; an electrical and monitoring system 7; a jack 8; a simulation support 9; a support platform 10; a simulated diaphragm wall 11; an infrared distance measuring device 12; and an infrared distance measurement output device 13.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
As shown in fig. 1, 2 and 4, the present embodiment provides a test apparatus for simulating the influence of foundation pit excavation using a support servo system on a tunnel and actively controlling the same, which includes a model box 1, a soil body 2 is filled in the model box 1, a simulated tunnel pipe 3 and a foundation pit structural system are buried in the soil body 2, the foundation pit structural system is composed of a simulated support 9, a support platform 10 and a simulated diaphragm wall 11, the simulated diaphragm wall 11 encloses a simulated foundation pit, and a plurality of strain gauges 4 are arranged around the outer side wall of the simulated diaphragm wall 11. The simulation support is arranged according to the working condition to be simulated. The simulation support 9 can be connected with the simulation ground wall at one end and connected with the jack 8 through a high-strength bolt at the other end, and is erected on the support platform 10, and the jack 8 is in contact with the simulation ground wall 11. The two ends of the simulation support 9 can also be directly contacted with the simulation ground connecting wall; and a plurality of infrared distance measuring devices 12 and strain gauges 4 are arranged on the inner wall of the simulated tunnel pipe 3.
Specifically, as shown in fig. 3, a plurality of simulation supports 9 with different heights are arranged inside the excavation area of the foundation pit from top to bottom, and the simulation supports 9 may be transverse supports or oblique supports and can be adjusted according to design requirements. The number and the arrangement form of the simulation supports 9 can be flexibly adjusted according to the simulated excavation working conditions. For example, in the present embodiment, there are three layers of supports, and each layer of support includes 3 transverse dummy supports 9 and 4 diagonal dummy supports 9.
Specifically, the simulation support 9 is connected with the jack 8 through a high-strength bolt and erected on the support platform 10, the jack 8 is connected with the electrical and monitoring system 7 through the lead 5, and the electrical and monitoring system 7 can adjust and record the axial force on the jack 8 in real time.
Specifically, the lateral wall of simulation ground is equipped with a plurality of foil gauges 4 all around even wall 11, can monitor the foundation ditch excavation in-process, and the deformation of simulation ground is even wall 11, and foil gauge 4 position carries out nimble adjustment according to the simulation excavation operating mode. For example, in the present embodiment, a total of 30 strain gauges are disposed on the outer side wall of the simulated diaphragm wall 11.
Specifically, simulation tunnel pipe 3 sets up a plurality of monitoring sections according to a determining deviation, and every monitoring section sets up 4 infrared distance measuring device 12 and 4 foil gage 4, infrared distance measuring device 12 and foil gage 4 are located simulation tunnel pipe 3's both sides hunch waist, vault and hunch bottom position respectively, can monitor the foundation ditch excavation in-process, and the deformation and the internal force of simulation tunnel pipe 3 change.
Specifically, the infrared ranging devices 12 are paired in pairs, and are connected with the infrared ranging output device 13 through the conducting wire 5 to measure the deformation of the simulated tunnel pipe 3.
Specifically, the strain gauge 4 is connected with an automatic data acquisition instrument through a lead 5, and the change of the internal force of the simulated tunnel pipe 3 is measured.
When the indoor simulation test device for simulating the influence of the foundation pit excavation adopting the supporting servo system on the tunnel and actively controlling is used, the indoor simulation test device comprises the following components:
1) arrangement test device
An infrared distance measuring device 12 and a strain gauge 4 are arranged on the inner wall of a corresponding monitoring section of the simulated tunnel pipe 3 and are respectively connected with an infrared distance measuring output device 13 and an automatic data acquisition instrument 6 through a lead 5; fixing the simulated tunnel pipe 3 at a corresponding position of the model box 1, and then filling a soil body 2 into the model box 1; installing a plurality of strain gauges 4 at corresponding positions of the side wall of the simulated diaphragm wall 11 as required, wherein the strain gauges 4 are connected with an automatic data acquisition instrument 6; after the installation is finished, the simulation ground wall 11 is inserted into the corresponding position in the soil body 2, and the simulation ground wall 11 encloses a simulation foundation pit.
2) After the arrangement is finished, simulation construction is carried out:
2.1) carrying out layered excavation on the simulated foundation pit, stopping excavation when the soil body in the foundation pit is excavated to the erection height of the corresponding simulation support 9, arranging a support platform 10 in the simulated foundation pit and laying the simulation support 9, wherein one end of the simulation support 9 is in contact with the simulation diaphragm wall 11, and the other end of the simulation support 9 can be connected with a jack 8 through a bolt according to needs and then is in contact with the other simulation diaphragm wall 11, or can be directly in contact with the other simulation diaphragm wall 11; the simulation support 9 is erected on the support platform 10, and the jack 8 is connected with the electrical and monitoring system 7; after the installation is finished, the next layer of earthwork excavation is carried out;
and 2.2) when the support is excavated to the next simulation support erection height, repeating the step 2.1) until the bottom of the designed foundation pit is excavated.
2.3) among the excavation process, adjust and record through electric and monitored control system 7 and simulate the axial force on supporting 9 and the jack 8, automatic data acquisition instrument 6 and infrared ranging output device 13 record in real time simultaneously and simulate the deformation condition of diaphragm wall 11 and simulation tunnel pipe 3, and then simulate out the foundation ditch excavation that adopts support servo to influence the tunnel, research servo active control is to the effect that the tunnel warp and resumes.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A test device for simulating the influence of foundation pit excavation adopting a support servo system on a tunnel and actively controlling the influence is characterized by comprising a model box, a simulated tunnel pipe, a foundation pit structure system, a hydraulic servo system and a measuring system; the model box is filled with soil; the foundation pit structure system comprises a simulation support and a simulation diaphragm wall, the simulation diaphragm wall is inserted into a soil body, a plurality of strain gauges are arranged on the outer wall of the periphery of the simulation diaphragm wall, and the simulation support is in a servo support form; the hydraulic servo system can control the axial force applied to the simulation support and record the axial force; the measuring system is used for acquiring measuring signals of each strain gauge and the infrared ranging device.
2. The apparatus of claim 1, wherein the excavation area of the excavation site is provided with a plurality of simulation supports having different heights from top to bottom.
3. The test device for simulating the influence and the active control on the tunnel of foundation pit excavation by using the support servo system according to claim 1, wherein the hydraulic servo system comprises an electrical and monitoring system and a jack, and the simulation support is connected with the jack through a bolt; the jack is connected with an electrical and monitoring system through a lead, and the electrical and monitoring system can adjust and record the axial force on the jack in real time.
4. The apparatus of claim 3, wherein the support platform is disposed on a support platform, the support platform being located within the excavation area of the excavation, the support platform counteracting the weight of the support platform and constraining lateral movement of the support platform.
5. The test device for simulating the influence and the active control on the tunnel of the foundation pit excavation adopting the supporting servo system as claimed in claim 1, wherein the measuring system comprises an automatic data acquisition instrument, a strain gauge connected with the automatic data acquisition instrument, an infrared distance measuring output system and an infrared distance measuring device connected with the infrared distance measuring output system.
6. The test device for simulating the influence and the active control on the tunnel of the foundation pit excavation adopting the supporting servo system according to claim 5, wherein the strain gauge and the infrared distance measuring device are fixed at the positions of the arch waist, the arch crown and the arch bottom on two sides of the inner wall of the measured section.
7. The test device for simulating the influence and the active control on the tunnel of the foundation pit excavation adopting the supporting servo system as claimed in claim 5, wherein a plurality of strain gauges are arranged on the peripheral outer wall of the simulated diaphragm wall, and the strain gauges are connected with an automatic data acquisition instrument.
8. A test method for simulating the influence and active control of foundation pit excavation by a support servo system on a tunnel is characterized by comprising the following steps:
1) arrangement test device
Installing an infrared distance measuring device and a strain gauge on the inner wall of a corresponding monitoring section of the simulated tunnel pipe, and respectively connecting the infrared distance measuring output device and the automatic data acquisition instrument through leads; fixing the simulated tunnel pipe at a corresponding position of the model box, and then filling soil into the model box; installing a plurality of strain gauges at corresponding positions of the side wall of the simulated diaphragm wall as required, wherein the strain gauges are connected with an automatic data acquisition instrument; after the installation is finished, inserting the simulation diaphragm wall into the corresponding position in the soil body, and enclosing the simulation diaphragm wall into a simulation foundation pit;
2) after the arrangement is finished, simulation construction is carried out:
2.1) carrying out layered excavation on the simulated foundation pit; when the soil body in the foundation pit is excavated to the corresponding simulation support erection height, stopping excavation, arranging a support platform in the simulation foundation pit and laying simulation supports, wherein one end of each simulation support is in contact with the simulation ground connection wall, and the other end of each simulation support can be connected with a jack through a bolt according to needs and then the jack is in contact with the other simulation ground connection wall, or can be in direct contact with the other simulation ground connection wall; the simulation support frame is arranged on the support platform, and the jack is connected with the electrical and monitoring system; after the installation is finished, the next layer of earthwork excavation is carried out;
2.2) repeating the step 2.1) when the support is excavated to the next simulated support erection height until the bottom of the designed foundation pit is excavated;
2.3 in the excavation process, adjust and record through electric and monitored control system and simulate the axial force on support and the jack, automatic data acquisition appearance and infrared ranging output device record in real time simultaneously and simulate the deformation condition of ground wall and simulation tunnel pipe, and then simulate out the foundation ditch excavation that adopts support servo to influence the tunnel, research servo active control is to the effect that the tunnel warp and resumes.
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| CN202210087667.4A CN114482150A (en) | 2022-01-25 | 2022-01-25 | Test device for simulating influence and active control of foundation pit excavation adopting supporting servo system on tunnel |
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2022
- 2022-01-25 CN CN202210087667.4A patent/CN114482150A/en active Pending
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