CN116858584B - Multifunctional pipe jacking model test device and test method - Google Patents
Multifunctional pipe jacking model test device and test method Download PDFInfo
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- CN116858584B CN116858584B CN202310831721.6A CN202310831721A CN116858584B CN 116858584 B CN116858584 B CN 116858584B CN 202310831721 A CN202310831721 A CN 202310831721A CN 116858584 B CN116858584 B CN 116858584B
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- 238000012360 testing method Methods 0.000 title claims abstract description 45
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000005192 partition Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000002689 soil Substances 0.000 claims description 61
- 238000003384 imaging method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000003556 assay Methods 0.000 claims 2
- 238000005429 filling process Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a multifunctional pipe-jacking model test device and a test method, which relate to the field of underground geotechnical engineering test and comprise the following steps: multi-pose pipe joints; the multi-section model box is characterized in that an inlet hole and an outlet hole are respectively formed in opposite side walls, an opening partition plate is arranged between the inlet hole and the outlet hole, and a pipe section hole is formed in the opening partition plate for a multi-gesture pipe section to pass through; the power structure comprises a jack and a pressure sensor, the jack is arranged on one side of the multi-section model box, which is close to the entrance opening, the jack is used for pushing the multi-gesture pipe joint to move towards the exit opening, and the pressure sensor is arranged between the free end of the jack and the multi-gesture pipe joint; the data acquisition system is used for being connected with the jack and the pressure sensor through signals, the multi-section model box can be used for carrying out various jacking tests, and can simulate the pipe joints which are connected with each other, so that force transmission characteristic simulation caused by change of contact areas in the jacking process of the multi-posture pipe joints is realized.
Description
Technical Field
The invention relates to the field of underground geotechnical engineering tests, in particular to a multifunctional pipe-jacking model test device and a test method.
Background
In recent years, as development and utilization processes of underground spaces are accelerated, a pipe jacking method, which is a non-excavation key technology, is widely used. For pipe jacking engineering under complex engineering geological conditions, the existing related theory is difficult to accurately predict the interaction rule between stress and deformation, and a simple field test often has uncertainty and randomness and is difficult to repeat, so that an indoor model test is necessary to be designed to accurately grasp the change rule in the pipe jacking process, and reference and guidance are provided for actual construction.
A rectangular pipe-jacking model test device discloses a model test box, a pushing platform, a press, a pressure plate, a prefabricated model pipe piece and a grouting system.
A pipe-jacking model test device discloses a test bed, a splicing type test box, a pipe-jacking model, a transverse loading device, a grouting system and a data acquisition system; the device can accurately test the sedimentation of soil and the internal pressure change in the jacking process of the jacking pipe, but the patent of the invention can not obtain dynamic surface deformation data.
Disclosure of Invention
The invention provides a multifunctional pipe jacking model test device and a test method, and aims to solve the problems of contact force transfer of a multi-posture pipe joint in the jacking process and simulated jacking of a complex stratum.
In order to achieve the above object, an embodiment of the present invention provides a multifunctional push pipe model test apparatus, including:
multi-pose pipe joints;
the multi-section model box is characterized in that a hole inlet and a hole outlet are respectively formed in opposite side walls, a plurality of opening partition plates are arranged between the hole inlet and the hole outlet, different soil layers are filled between adjacent opening partition plates, and pipe section holes are formed in the opening partition plates for a multi-gesture pipe section to pass through;
the power structure comprises a jack and a pressure sensor, the jack is arranged on one side of the multi-section model box, which is close to the entrance, the jack is used for pushing the multi-gesture pipe joint to move towards the exit, and the pressure sensor is arranged between the free end of the jack and the multi-gesture pipe joint;
and the data acquisition system is used for being in signal connection with the jack and the pressure sensor.
Preferably, the multifunctional pipe jacking model test device further comprises a supporting counterforce structure arranged at the position of the hole, the supporting counterforce structure comprises a supporting counterforce support, the supporting counterforce support is used for being arranged on the table top, a counterforce sleeve frame for allowing the pipe joints of multiple postures to pass through is arranged on the supporting counterforce support, a plurality of supporting units with different heights are arranged between the inner wall and the outer wall of the counterforce sleeve frame, a frame force plate is lapped on the supporting units, and the jack is arranged on the frame force plate.
Preferably, the multifunctional pipe jacking model test device further comprises a funnel, wherein the funnel is arranged above the multi-section model box and used for filling soil bodies into the multi-section model box.
Preferably, the multi-state pipe joint comprises two pipe joints which are connected with each other, and the end surfaces of the two pipe joints which are connected with each other show the same structure.
Preferably, the end face of the pipe section has one of an upper inclination angle structure, a lower inclination angle structure, a top contact structure, a bottom contact structure and a full contact structure.
The application also provides a test method for simulating stress under different contact areas of the multi-attitude pipe joint, and the multifunctional pipe jacking model test device comprises the following steps:
s1, arranging an opening partition plate in a multi-section model box, keeping a pipe section hole at a position above a horizontal central line of the opening partition plate, and connecting end surfaces of two pipe sections in an outer sleeve manner to form different abutting states, wherein one pipe section is provided with a strain gauge, and the strain gauge is axially arranged around the pipe section;
s2, connecting a data acquisition system and a power structure, and filling soil layers into the multi-section model box;
s3, controlling the jacking pressure of the jack, obtaining the value of the pressure sensor, reading the strain value of the pipe joint, and completing the recording of the stressed deformation data of the pipe joint under the primary load;
s4, changing the jacking pressure of the jack, repeating the step S3, and recording the pipe joint stress deformation data under different jacking pressures;
s5, replacing pipe joints with different end faces, and repeating the steps S1-S4.
The application also provides another test method for simulating a multi-attitude pipe joint jacking test, and the multifunctional pipe jacking model test device comprises the following steps:
the multifunctional pipe-jacking model test device also comprises a miniature soil pressure sensor, a total station and a machine head which are in signal connection with the data acquisition system;
the test method comprises the following steps:
s1, arranging an opening partition plate in a multi-section model box, keeping a pipe section hole at a position above a horizontal central line of the opening partition plate, and filling soil bodies of different materials among the opening partition plates in the multi-section model box to respectively form different soil layers;
s2, connecting end surfaces of two pipe joints in an inner sleeve mode to form different abutting states, wherein a strain gauge is arranged on one pipe joint and is arranged around the axial direction of the pipe joint;
s3, sticking a reflective patch inside the pipe joint, and collecting initial data of the reflective patch and first deformation data of the upper surface of the soil layer before jacking;
s4, installing a machine head on the end face of the front pipe joint for tunneling, arranging a miniature soil pressure sensor on the machine head, taking down the miniature soil pressure sensor after the multi-attitude pipe joint is jacked into the soil layer to acquire data of the miniature soil pressure sensor, arranging a revolution sensor and a time sensor on the pipe joint, and constructing a relation curve of revolution and time;
s5, jacking the multi-attitude pipe joints into a multi-section model box, acquiring second deformation data of the upper surface of each soil layer and axis motion data of the multi-attitude pipe joints, and comparing initial data to acquire motion and deflection tracks in the motion process of the multi-attitude pipe joints;
s6, in the step S1, downward acting force is applied to different soil layers to simulate different deep burying working conditions, and the steps S2-S5 are repeated;
s7, installing pipe joints with different roughness, repeating the steps S1-S6, and performing friction resistance influence tests of the roughness on the multi-pose pipe joints under different deep-buried working conditions.
Preferably, the apparatus further comprises a 3D imaging camera;
the upper surface of each soil layer is provided with a plurality of characteristic points, and the 3D imaging camera shoots the characteristic points to acquire first deformation data and second deformation data of each soil layer.
Preferably, the funnels are located at the same height during the filling of each soil layer.
The scheme of the invention has the following beneficial effects:
in this application, multistage model case can be used to the going on of multiple jacking test to can simulate interconnect's tube coupling, realize that many gesture tube coupling is in the jacking in-process because of the power characteristic simulation that the area of contact changes arouses. Meanwhile, the multi-section model box is provided with the split partition plate, so that the simulation of a complex soil layer can be simulated, and the simulation is closer to a real environment.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic diagram of a multifunctional push bench model test apparatus;
FIG. 2 is a schematic illustration of a support reaction structure;
fig. 3 is a schematic view of a support unit;
FIG. 4 is a schematic view of a different end face of a pipe section;
FIG. 5 is a schematic illustration of the connection of pipe sections by means of an inner or outer sleeve
FIG. 6 is a schematic view of the installation of strain gauges;
fig. 7 is a graph showing the relationship between the rotational speed and the jacking distance.
[ reference numerals description ]
1-multi-pose tube sections, 11-tube sections, 12-strain gauges, 14-inner tube sections, 15-outer tube sections, 16-pressure sensors, 2-multi-section model boxes, 21-inlet holes, 22-outlet holes, 31-jacks, 4-data acquisition systems, 51-support reaction brackets, 52-reaction brackets, 531-anchors, 532-anchors, 54-support force plates, 541-clamps, 6-funnels, 7-total stations, 8-machine heads and 9-3D imaging cameras.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-6, an embodiment of the present invention provides a multifunctional pipe jacking model test device, which includes a multi-posture pipe joint 1, a multi-section model box 2, a power structure and a data acquisition system 4. Wherein, the top of multistage model case 2 is uncovered, is provided with respectively on the opposite lateral wall of multistage model case 2 and advances entrance to a cave 21 and exit to a cave 22, is provided with a plurality of detachable split division boards between advance entrance to a cave 21 and exit to a cave 22, and split division board separates multistage model case 2 into a plurality of spaces that are used for filling the soil body, can fill the simulation that the soil body of different materials is used for complicated stratum in every space, is provided with the pipe section entrance to a cave on the split division board. The multi-state pipe joint 1 can sequentially pass through the hole inlet 21, the pipe joint hole and the hole outlet 22.
The aforesaid power structure includes jack 31 and pressure sensor 16, and jack 31 sets up in the one side that multistage model case 2 is close to into the entrance to a cave 21, and jack 31 is used for promoting multi-gesture tube coupling 1 to go out the entrance to a cave 22 direction motion, and pressure sensor 16 installs between the free end of jack 31 and multi-gesture tube coupling 1.
The data acquisition system 4 is used for signal connection of the jack 31 and the pressure sensor 16.
In this application, multistage model case 2 inner wall is provided with a plurality of draw-in grooves that are used for joint split division board, through inserting the split division board of different quantity and fill the simulation that the soil body realized different jacking distance and operating mode between the split division board.
Further, the multifunctional pipe jacking model test device further comprises a supporting counterforce structure, the counterforce supporting structure is arranged at the position of the hole 21, the supporting counterforce structure comprises a supporting counterforce support 51, the supporting counterforce support 51 is used for being arranged on a table top, a counterforce sleeve frame 52 for the multi-gesture pipe joint 1 to pass through is arranged on the supporting counterforce support 51, a plurality of supporting units with different heights are arranged between the outer walls of the inner walls of the counterforce sleeve frame 52, a frame force plate 54 is lapped on the supporting units, and the jack 31 is arranged on the frame force plate 54.
The counterforce support structure is used for adjusting the height of the jack 31 and providing the counterforce of the jack 31, and the jack 31 acts on the stressed position of the multi-posture pipe joint 1 through the height adjustment of the counterforce support structure.
In this embodiment, by changing the overlapping of the force-supporting plates 54 on the supporting units with different heights, the positions of loading points of the jack 31 on the multi-pose pipe joint 1 are changed, and the influence of different loading positions on the force-bearing rule in the jacking process of the multi-pose pipe joint 1 is discussed.
The support unit in this embodiment comprises anchors 531 and struts 532, wherein the struts 532 are used to connect the inner and outer walls of the reaction frame 52 such that the inner and outer walls of the reaction frame 52 are concentric. A plurality of anchors 531 are provided between the inner and outer walls of the reaction frame 52, the plurality of anchors 531 being at different heights between the inner and outer walls of the reaction frame 52 to effect adjustment of the height of the frame force plate 54.
Preferably, the force plate 54 in this embodiment is provided with a clip 541 for preventing the jack 31 from falling off during the jacking process.
Preferably, the multifunctional pipe-jacking model test device further comprises a funnel 6, wherein the funnel 6 is arranged above the multi-section model, and the funnel 6 is used for filling soil into the multi-section model box 2 so as to form different soil layers between adjacent opening partition plates.
The multi-state pipe joint 1 comprises at least two pipe joints 11 which are connected with each other, and the connecting end surfaces of the two pipe joints 11 are of the same structure. Referring to fig. 4, the end surface of the pipe joint 11 has one of an upper inclination structure, a lower inclination structure, a top contact structure, a bottom contact structure, and a full contact structure. Wherein the upper pitch structure comprises a pitch angle of 60 ° upward inclination, a pitch angle of 75 ° upward inclination. The downtilt structure includes a 60 ° downtilt tilt angle, a 75 ° downtilt tilt angle. The top contact structure is protruding for the upper end of tube coupling 11 terminal surface, and the bottom contact structure is protruding for the lower extreme of tube coupling 11 terminal surface. The full contact structure is that the upper end and the lower end of the end face of the pipe joint 11 are both convex.
The application also provides a test method for simulating stress of the multi-pose pipe joint 1 under different contact areas, and the multifunctional pipe jacking model test device comprises the following steps:
s1, arranging an opening partition plate in a multi-section model box 2, wherein a pipe section hole is positioned above the horizontal central line of the opening partition plate to ensure that the pipe section is staggered with the pipe section hole, connecting the end surfaces of two pipe sections 11 by adopting an outer sleeve 15 to form different abutting states, such as connecting the two pipe sections 11 which incline upwards by 60 degrees, wherein the inclined angles of the two pipe sections 11 are mutually abutted, and a V-shaped space is formed above the connection of the two pipe sections 11. The contact of the adjacent pipe joints 11 is ensured by adopting the mode of the inner sleeve 14, and the pipe joint 11 can be used for force transmission. On one of the pipe sections 11, strain gauges 12 are provided, the strain gauges 12 being arranged around the axial direction of the pipe section 11. The strain gauge 12 is a strain gauge sensor in this embodiment.
S2, connecting the data acquisition system 4 with a power structure;
s3, controlling the jacking pressure of the jack 31, and acquiring the numerical value of the pressure sensor 16 and the strain value of the pipe joint 11 to complete the recording of the stress deformation data of the pipe joint 11 under the primary load.
S4, changing the jacking pressure of the jack 31, repeating the step S3, and recording the stress deformation data of the pipe joint 11 under different jacking pressures;
s5, replacing the pipe joints 11 with different end faces, and repeating the steps S1-S4.
According to the test method, different contact structures of the multi-gesture pipe joint 1 can be set, and force transmission characteristic simulation caused by change of contact area of the multi-gesture pipe joint 1 in the jacking process is realized.
The application also provides another test method for simulating a multi-pose pipe joint 1 jacking test, which adopts the multifunctional pipe jacking model test device and comprises the following steps:
the multifunctional pipe jacking model test device further comprises a miniature soil pressure sensor, a total station 7, a 3D imaging camera 9 and a machine head 8, wherein the miniature soil pressure sensor and the total station 7 are used for being connected with a collecting system through signals.
S1, arranging the split partition plates in a multi-section model box 2, keeping pipe section openings at positions above the horizontal central line of the split partition plates, ensuring that the pipe sections and the pipe section openings are opposite to each other, filling soil bodies of different materials among the split partition plates in the multi-section model box 2, and respectively forming soil layers 1, 2 and 3 to simulate a complex soil layer environment.
S2, connecting end faces of the two pipe sections 11 in a mode of the inner sleeve 14 to form different abutting states, wherein strain gauges 12 are arranged on one pipe section 11, and the strain gauges 12 are axially arranged around the pipe section 11. The strain gage 12 in this embodiment employs a strain gage sensor.
The use of the inner sleeve 14 prevents additional frictional resistance during the jacking process.
S3, sticking a reflective patch inside the pipe joint 11, and collecting the initial position of the reflective patch and first deformation data of the upper surface of each soil layer before jacking. The total station 7 can acquire the optical signals of the reflective paste, so as to acquire the change rule of the axis of the pipe joint 11 when the multi-posture pipe joint 1 is jacked in.
S4, installing a machine head 8 on the end face of the front end pipe joint 11 for tunneling, arranging a miniature soil pressure sensor on the machine head 8, taking down the miniature soil pressure sensor after acquiring data of the miniature soil pressure sensor when the multi-state pipe joint 1 is jacked into each soil layer, arranging a revolution sensor and a time sensor on the pipe joint 11, and constructing a relation curve of revolution and time.
In step S4, the machine head 8 is kept standby during pre-jacking, so as to avoid affecting the micro soil pressure sensor, and in the jacking process, the machine head 8 is started to work.
S5, jacking the multi-gesture pipe joint 1 into the multi-section model box 2, acquiring second deformation data of the upper surface of each soil layer and axis motion data of the multi-gesture pipe joint 1, and comparing the initial data to acquire a motion track and a deflection track in the motion process of the multi-gesture pipe joint 1.
The first deformation data and the second deformation data are acquired in steps S3 and S5 as follows: a plurality of characteristic points are arranged on the upper surface of each soil layer, and the 3D imaging camera 9 photographs and compares each characteristic point at regular time to acquire the variation of the first deformation data and the second deformation data.
A set of reference points (A, B, C) are respectively set in the three soil layers, each set of reference points is provided with three characteristic points, each characteristic point is used for feeding back deformation data of the corresponding soil layer, a relation curve of rotating speed and jacking distance is formed as shown in fig. 7, wherein black dots represent soil pressure detected by the pressure sensor 16, and rectangular frame points represent rotating speed under current pressure.
S6, in the step S1, downward acting force is applied to different soil layers to simulate different deep burying working conditions, and the steps S2 and S5 are repeated.
In this step, more soil bodies can be uniformly filled on different soil layers or weights such as weights can be applied on the soil layers.
S7, installing pipe joints 11 with different roughness, repeating the steps S1-S6, and performing friction resistance influence tests on the multi-pose pipe joint 1 under different deep-buried working conditions. The funnels 6 should be ensured to be at the same height when repeating step S1, to ensure that the soil layer thickness and density of each soil layer in each test are the same.
The roughness of the pipe joint 11 may be based on the actual roughness of the pipe joint 11 during construction, or may be a plurality of roughness analog groups manually set.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (8)
1. A multifunctional pipe jacking model test device is characterized by comprising:
a multi-posture pipe joint (1);
the multi-section model box (2) is characterized in that a hole inlet (21) and a hole outlet (22) are respectively formed in opposite side walls, a plurality of opening partition plates are arranged between the hole inlet (21) and the hole outlet (22), different soil layers are filled between adjacent opening partition plates, and pipe joint holes are formed in the opening partition plates for allowing multi-gesture pipe joints (1) to pass through;
the power structure comprises a jack (31) and a pressure sensor (16), wherein the jack (31) is arranged on one side of the multi-section model box (2) close to the entrance (21), the jack (31) is used for pushing the multi-gesture pipe joint (1) to move towards the exit (22), and the pressure sensor (16) is arranged between the free end of the jack (31) and the multi-gesture pipe joint (1);
the data acquisition system (4) is used for being connected with the jack (31) and the pressure sensor (16) in a signal mode;
the multifunctional pipe jacking model test device further comprises a supporting counterforce structure arranged at the entrance (21), the supporting counterforce structure comprises a supporting counterforce support (51), the supporting counterforce support (51) is used for being arranged on a table top, a counterforce sleeve frame (52) for allowing the multi-gesture pipe joint (1) to pass through is arranged on the supporting counterforce support (51), a plurality of supporting units with different heights are arranged between the inner wall and the outer wall of the counterforce sleeve frame (52), a frame force plate (54) is lapped on the supporting units, and the jack (31) is arranged on the frame force plate (54).
2. The multifunctional jacking pipe model test device according to claim 1, wherein: the multifunctional pipe-jacking model test device further comprises a funnel (6), and the funnel (6) is arranged above the multi-section model box (2) and used for filling soil bodies into the multi-section model box (2).
3. The multifunctional jacking pipe model test device according to claim 2, wherein: the multi-gesture pipe joint (1) comprises two pipe joints (11) which are connected with each other, and end faces of the two pipe joints (11) which are connected with each other show the same structure.
4. The multifunctional jacking pipe model test device according to claim 3, wherein: the end face of the pipe joint (11) is provided with one of an upper inclination angle structure, a lower inclination angle structure, a top contact structure, a bottom contact structure and a full contact structure.
5. The test method for simulating stress of the multi-pose pipe joint under different contact areas is characterized by comprising the following steps of:
s1, arranging an opening partition plate in a multi-section model box (2), keeping a pipe section hole at a position above a horizontal central line of the opening partition plate, connecting end surfaces of two pipe sections (11) in a mode of an outer sleeve (15) to form different abutting states, wherein the pipe sections and the pipe section hole are arranged in a staggered mode, a strain gauge (12) is arranged on one pipe section (11), and the strain gauge (12) is arranged around the axial direction of the pipe section (11);
s2, connecting a data acquisition system (4) and a power structure;
s3, controlling the jacking pressure of the jack (31), acquiring the value of the pressure sensor (16), reading the strain value of the pipe joint (11), and completing the recording of the stress deformation data of the pipe joint (11) under the primary load;
s4, changing the jacking pressure of the jack (31), repeating the step S3, and recording the stress deformation data of the pipe joint (11) under different jacking pressures;
s5, replacing pipe joints (11) with different end faces, and repeating the steps S1-S4.
6. The test method for simulating the multi-attitude pipe joint jacking test adopts the multifunctional pipe jacking model test device as claimed in claim 4, and is characterized by comprising the following steps:
the multifunctional pipe-jacking model test device also comprises a miniature soil pressure sensor, a total station (7) and a machine head (8), wherein the miniature soil pressure sensor is in signal connection with the data acquisition system (4);
the test method comprises the following steps:
s1, arranging the split partition plates in a multi-section model box (2), keeping pipe joint holes at positions above the horizontal central line of the split partition plates, arranging pipe joints and the pipe joint holes in a right opposite way, filling soil bodies of different materials among the split partition plates in the multi-section model box (2), and forming different soil layers respectively;
s2, connecting end surfaces of two pipe joints (11) in a mode of an inner sleeve (14) to form different abutting states, wherein a strain gauge (12) is arranged on one pipe joint (11), and the strain gauge (12) is arranged around the axial direction of the pipe joint (11);
s3, sticking a reflective patch inside the pipe joint (11), and collecting initial data of the reflective patch and first deformation data of the upper surface of the soil layer before jacking;
s4, installing a machine head (8) on the end face of the front end pipe joint (11), arranging a miniature soil pressure sensor (16) on the machine head (8), taking down the miniature soil pressure sensor (16) after the multi-state pipe joint (1) is jacked into the soil layer to acquire data of the miniature soil pressure sensor (16), arranging a revolution sensor and a time sensor on the pipe joint (11), jacking by utilizing the machine head (8), and constructing a relation curve of revolution and time;
s5, when the multi-gesture pipe joint (1) is jacked into the multi-section model box (2), second deformation data of the upper surface of each soil layer and axis motion data of the multi-gesture pipe joint (1) are obtained, and motion and deflection tracks in the motion process of the multi-gesture pipe joint (1) are obtained by comparing initial data;
s6, in the step S1, downward acting force is applied to different soil layers to simulate different deep burying working conditions, and the steps S2-S5 are repeated;
s7, installing pipe joints (11) with different roughness, repeating the steps S1-S6, and performing friction resistance influence tests of the roughness on the multi-state pipe joints (1) under different deep-buried working conditions.
7. The assay method of claim 6, wherein: the device further comprises a 3D imaging camera (9);
the upper surface of each soil layer is provided with a plurality of characteristic points, and the 3D imaging camera (9) shoots the characteristic points to acquire first deformation data and second deformation data of each soil layer.
8. The assay method of claim 7, wherein: in the filling process of each soil layer, the funnels (6) are positioned at the same height.
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