Test system and method for simulating multi-angle fault dislocation and interaction of pipe and soil body

Abstract

The invention discloses a test system and a test method for simulating interaction between pipe and soil under multi-angle fault movement and seismic oscillation coupling. The test system comprises the following components: a model box assembly, a sliding system and a loading system. The model box assembly is composed of a lower bottom plate, an upper bottom plate, a side plate, an end plate, a partition plate, a square steel pipe, a sliding plate, a high-strength bolt, a nut, a sliding rail, a sliding block, a spherical hinge and the like. The sliding system is composed of a ball, a U-shaped sliding groove and the like. The loading system is composed of a vertical jack, a horizontal longitudinal jack, a horizontal transverse jack, a counter-force box and the like. According to the invention, a fault inclination angle and various horizontal crossing angles in a range of 45-90 degrees can be set, and the influence of strike-slip, forward and reverse, oblique slip and other fault dislocations and fault and seismic oscillation coupling on the safety of the whole structure of the pipeline can be simulated. The device is easy to manufacture, convenient to operate and high in safety.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical engineering test technology, and in particular to a pipe-soil interaction test system and method for simulating multi-angle fault dislocation and ground motion coupling. Background Art

[0002] With the continuous advancement of my country's modernization construction, pipeline engineering has been vigorously developed, and the safety performance of pipelines under complex geological conditions and earthquakes has also attracted more and more attention. At present, the research on pipeline engineering mainly tends to focus on two aspects: experiments and numerical simulations, and model experiments are more respected for their intuitiveness and reliability.

[0003] The existing model boxes used to simulate pipeline fault dislocation have fixed fault dip angles, and the fault sliding mode is relatively simple and mainly reverse fault dislocation. There are relatively few simulations of strike-slip faults and oblique-slip dislocation. However, in actual engineering, the fault dip angles and dislocation modes are complex and diverse, and fault dislocation cannot be simply limited to reverse fault slip with fixed dip angles. In addition, with the continuous development of the field of pipeline engineering, there are more and more cases of pipelines crossing faults, while there are relatively few cases of vertical crossing faults. The mechanical response of the pipeline structure to fault dislocation and seismic action at different crossing angles is also different. At the same time, studies have found that buildings and structures located near faults are more susceptible to damage due to earthquake responses.

[0004] Therefore, in order to specifically study multi-angle fault displacement and the stress and deformation state of the pipeline under the coupling of fault displacement and seismic motion, and to avoid the serious impact of fault displacement and earthquake on the safe operation of the pipeline, a pipe-soil interaction test system and method for simulating multi-angle fault displacement and seismic motion coupling were proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a pipe-soil interaction test system and method for simulating multi-angle fault dislocation and seismic coupling according to the above-mentioned deficiencies of the prior art. The device mainly changes the fault inclination and the horizontal angle of the pipeline crossing the fault by telescopic square steel pipe 5 length and sliding plate 6 angle, and applies different vertical and horizontal displacements to simulate the fault dislocation form through the coordinated action of vertical jack 14, horizontal longitudinal jack 15, and horizontal transverse jack 16, and finally applies seismic to the model box. The system has a simple structure, convenient operation, strong applicability, and good promotion value.

[0006] The implementation of the present invention is completed by the following technical solutions: a pipe-soil interaction test system and method for simulating multi-angle fault dislocation and seismic coupling, characterized in that it includes the following components: a lower base plate 1-1, an upper base plate 1-2, a side plate 2-1, a side plate 2-2 acrylic plate, an end plate 3-1, an end plate 3-2, a partition 4, a square steel pipe 5, a sliding plate 6, a high-strength bolt 7, a nut 8, a slide rail 9, a slider 10, a ball joint 11, a ball 12, a "U"-shaped slide 13, a vertical jack 14, a horizontal longitudinal jack 15, a horizontal transverse jack 16, and a reaction box 17.

[0007] The model box assembly consists of a lower base plate 1-1, an upper base plate 1-2, a side plate 2-1, an acrylic plate of the side plate 2-2, a first end plate 3-1, a second end plate 3-2, a partition 4, a square steel pipe 5, a sliding plate 6, high-strength bolts 7, nuts 8, a slide rail 9, a slider 10, a ball joint 11, etc.

[0008] The sliding system is composed of a ball 12, a "U"-shaped sliding groove 13 and the like.

[0009] The loading system is composed of a vertical jack 14 , a horizontal longitudinal jack 15 , a horizontal transverse jack 16 , a reaction box 17 and the like.

[0010] Furthermore, vertical and horizontal square steel pipes 5 are welded to form the upper and lower plate model box frames. The lower bottom plate 1-1 is welded at the bottom of the model box frame, and the upper surface of the lower bottom plate 1-1 is welded with a partition plate 4 and a nut 8. The upper bottom plate 1-2 is connected to the lower bottom plate 1-1 by high-strength bolts 7. A horizontal notch is reserved in the middle of the partition plate 4. A square steel pipe 5 with a horizontal groove is placed between the lower bottom plate 1-1 and the upper bottom plate 1-2. The square steel pipe 5 and the partition plate 4 are connected and fixed by high-strength bolts 7 and nuts 8 that penetrate the horizontal notch.

[0011] Further, the horizontal longitudinal square steel tubes 5 welded to the side panels 2-1 are long and short. The bottom square steel tubes 5 of the side panels of the lower plate model box are long, and the top square steel tubes 5 are short. There are retractable square steel tubes 5 in the horizontal longitudinal square steel tubes 5 of the side panels. By stretching and contracting the retractable square steel tubes 5 in the horizontal longitudinal square steel tubes 5 of the side walls of the model box, an angle of 45°-90° can be formed with the horizontal plane in the vertical direction. By adjusting the length of the retractable square steel tubes 5, the length of the square steel tubes 5 on one side is made greater than or equal to the length of the square steel tubes 5 on the other side, so that the fault position forms an angle of 45°-90° with the longitudinal direction of the model on the horizontal plane. The top and bottom welded square steel tubes 5 of the side panels of the upper plate model box are arranged opposite to the retractable square steel tubes 5. The length of the horizontal longitudinal square steel tubes 5 on the top of the lower plate model box is less than or equal to the length of the horizontal longitudinal square steel tubes 5 on the bottom, and the length of the horizontal longitudinal square steel tubes 5 on the top of the upper plate model box is greater than or equal to the length of the horizontal longitudinal square steel tubes 5 on the bottom. The overlapping parts of the telescopic square steel tube 5 and the non-telescoping square steel tube 5 are both provided with slots of a certain length, and the high-strength bolts 7 pass through the slots and are tightened with nuts 8 to adjust and limit the extension length of the telescopic square steel tube 5 .

[0012] Furthermore, the square steel tube 5 is connected with a ball joint 11 at the sliding surface of the upper and lower plate model box, one end of the ball joint 11 is fixed on the slider 10, and the other end is fixed on the end face of the square steel tube 5. The slide rail 9 is welded and fixed on the sliding plate 6, and the slider 10 is located inside the slide rail 9 and can slide along the track. The ball joint 11 at the bottom of the side plate of the model box is directly fixed on the square steel tube 5 and the sliding plate 6, so that the sliding plate can rotate with the ball joint 11 as the center. The ball joint 11 in the middle of the bottom plate of the model box is directly fixed on the square steel tube 5 and the sliding plate 6, so that the sliding plate 6 can rotate with the ball joint 11 as the center. By changing the longitudinal telescopic length of the square steel tube 5, the angle of the sliding plate can be adjusted to simulate different fault dips and the horizontal angle of the pipeline crossing the fault. Among them, the horizontal angle of the upper and lower plates is controlled by the embedded lower bottom plate 1-1 and the upper bottom plate 1-2, and the fault dip is fixed and controlled by the embedded side plate 2-2 acrylic plate.

[0013] Furthermore, the end plate 3-1 is welded to the longitudinal end of the model box, and a pipe-sized hole is left in the middle of the end plate 3-1; the end plate 3-2 is a detachable small steel plate that can seal the end of the model box. Both the end plate 3-1 and the end plate 3-2 are reserved with high-strength bolt holes and are fixed by high-strength bolts 7 and nuts 8.

[0014] Furthermore, multiple groups of vertical jacks 14 are arranged at the bottom of the model box, and balls 12 are arranged on the top of the vertical jacks 14. The model box can slide horizontally on the horizontal plane under the action of the balls 13. A "U"-shaped slide groove 13 is welded and fixed on the outer side of the side wall of the lower plate model box and the outer side of the end of the upper plate model box. Balls 12 are arranged on the heads of the horizontal longitudinal jacks 15 and the horizontal transverse jacks 16 to reduce the friction with the "U"-shaped slide groove 13, so that the vertical displacement of the upper and lower plate model boxes is not affected when the upper and lower plate model boxes slide obliquely relative to each other. In addition, a certain length of notch is reserved for the part of the lower bottom plate 1-1 of the model box that extends out of the outer side of the box body, and vertically fixed high-strength bolts 7 are inserted inside the notch, which can limit the longitudinal horizontal displacement of the lower plate model box and the transverse horizontal displacement of the upper plate model box when the fault is displaced. The vertical displacement of the model box can be controlled by tightening the nuts 8 on the upper surface of the lower bottom plate 1-1.

[0015] Furthermore, multiple groups of vertical jacks 14 are arranged at the bottom of the model box, and horizontal longitudinal jacks 15 and horizontal transverse jacks 16 are arranged at the ends and sides. The telescopic length of the longitudinal square steel pipe 5 at the contact part of the upper and lower plate model boxes is changed to adjust the angle between the sliding plate 6 and the horizontal plane, simulating different fault dips and the horizontal angle of the pipeline crossing the fault; the horizontal longitudinal jack 15 applies longitudinal displacement to the upper plate model box, the horizontal transverse jack 16 applies transverse displacement to the lower plate model box, and the vertical jack 14 applies vertical displacement to the upper and lower plate model boxes respectively. The displacement ratio applied by the vertical jack 14, the horizontal longitudinal jack 15, and the horizontal transverse jack 16 is calculated by the dip angle of the fault plane and the horizontal angle between the pipeline and the fault to ensure that the model box slides along the fault plane. Through the synergistic effect of the three types of jacks, the normal and reverse faults, strike-slip faults, oblique-slip faults and other dislocation forms can be simulated.

[0016] Furthermore, the horizontal longitudinal jack 15, the horizontal transverse jack 16, and the vertical jack 17 are fixed to the end, the side wall, and the bottom plate in the reaction box 17 by high-strength bolts 7, and the reaction box 17 is fixed to the vibration table by high-strength bolts 7. First, the three types of jacks are used to apply a specified displacement to the upper and lower plate model boxes to simulate the fault dislocation phenomenon, and then the displacement is stopped and the existing dislocation amount is kept unchanged, and then the nuts 8 on the upper surface of the lower bottom plate 1-1 are tightened to limit the vertical movement of the model box, and then the earthquake action is applied to the dislocation model in the reaction box 17 by the vibration table. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the required drawings will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional schematic diagram of the test system for simulating multi-angle fault dislocation and pipeline-soil interaction of the present invention.

[0019] Figure 2 It is a schematic diagram of the side wall structure arrangement of the model box of the present invention.

[0020] Figure 3 It is a schematic diagram of the longitudinal end plate structure of the model box of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the sliding plate of the model box of the present invention.

[0022] Figure 5 It is a schematic diagram of the bottom plate structure of the model box of the present invention.

[0023] Figure 6 It is a schematic diagram of the sliding and vertical loading system of the present invention.

[0024] Figure 7 It is a schematic diagram of the horizontal loading system of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention:

[0026] See also Figures 1 to 5 First, fix the reaction box 17 on the vibration table by high-strength bolts 7, fix the vertical jack 14 to the bottom of the reaction box 17 by high-strength bolts 7, and then place the assembled upper and lower plate model boxes on the vertical jack 14 in sequence, wherein the notch of the lower bottom plate 1-1 of the model box must pass through the high-strength bolts 7 fixed on the reaction box 17. When the horizontal longitudinal jack 15 and the horizontal transverse jack 16 are installed, the head is located in the "U"-shaped slide 16, ensuring that the ball 12 at the head can rotate freely in the "U"-shaped slide 16 to reduce the friction resistance so that the vertical displacement of the model box is not affected when the model box slides obliquely. The bottom of the jack is fixed to the reaction box 17 by high-strength bolts 7. By stretching and contracting the telescopic square steel pipe 5 in the horizontal longitudinal square steel pipe 5 on both sides of the model box, an inclined angle of 45°-90° is formed; the length of the telescopic square steel pipe 5 at the bottom of the model box is adjusted so that the fault position forms an angle of 45°-90° with the longitudinal direction of the pipeline on the horizontal plane. The length of the retractable square steel pipe 5 is fixed by high-strength bolts 7 and nuts 8 to allow the sliding plate 6 to form a certain inclination angle to simulate the fault inclination to be tested and the angle at which the pipeline horizontally crosses the fault. The model materials are filled and placed in the model box in sequence according to the similarity ratio theory.

[0027] The vertical jack 14 at the bottom of the model box is kept fixed, and the displacement ratio required to be applied by the horizontal longitudinal jack 15 and the horizontal transverse jack 16 is calculated according to the adjusted angle of the horizontal pipeline crossing the fault. The horizontal longitudinal jack 15 applies longitudinal displacement to the upper plate model box while the horizontal transverse jack 16 applies transverse displacement to the lower plate model box, so as to simulate the pipe-soil interaction under the strike-slip fault dislocation when the pipeline crosses the fault.

[0028] The lower plate model box is fixed, and the displacements required to be applied by the vertical jacks 14 and the horizontal longitudinal jacks 15 at the upper plate model box are calculated according to the fault dip angle adjusted in the test. Then, the vertical jacks 14 and the horizontal longitudinal jacks 15 work together to apply longitudinal and vertical displacements to the upper plate model box to simulate the reverse fault dislocation of the pipe soil along a certain dip angle.

[0029] Ensure that the vertical jack 14 at the bottom of the upper plate model box is fixed, and calculate the displacement required by the vertical jack 14 at the lower plate model box and the horizontal longitudinal jack 15 at the upper plate model box according to the fault dip angle adjusted in the test. When the vertical jack 14 at the bottom of the lower plate model box moves upward, the horizontal longitudinal jack 15 of the upper plate moves toward the reaction box 17. The two work together to simulate the normal fault dislocation of the pipe soil along a certain dip angle.

[0030] According to the adjusted fault inclination and the pipe-fault horizontal angle, the displacement values ​​applied by the vertical jack 14, the horizontal longitudinal jack 15, and the horizontal transverse jack 16 are calculated to ensure that the upper and lower plate model boxes can slide along the fault plane. While the horizontal transverse jack 16 applies transverse displacement to the lower plate model box, the vertical jack 14 and the horizontal longitudinal jack 15 at the upper plate model box apply vertical and horizontal longitudinal displacements to the upper plate model box. The synergistic effect of the three jacks can simulate the oblique sliding dislocation of the pipe soil along a certain inclination angle.

[0031] After the model fault displacement is completed, the high-strength bolts 7 passing through the notches of the lower bottom plate 1-1 of the model box are tightened by nuts 8, so that the model box is firmly fixed on the reaction box 17 under the upward jacking force of the vertical jack 14 and the downward tightening force of the nuts 8 on the lower bottom plate 1-1. Then, ground motion is applied to the model to simulate the soil response of the pipe under the coupling of fault displacement and ground motion.

Claims

1. A test system for simulating multi-angle fault dislocation and pipe-soil interaction, characterized in that: The system comprises the following components: a model box assembly, a sliding system and a loading system; the loading system applies different vertical and horizontal displacements to the model box through the sliding system to simulate the fault dislocation form, applies ground motion to the model box, and realizes multi-angle fault dislocation simulation; The model box assembly is composed of a lower base plate (1-1), an upper base plate (1-2), a first side plate (2-1), a second side plate (2-2), a first end plate (3-1), a second end plate (3-2), a partition plate (4), a square steel pipe (5), a sliding plate (6), high-strength bolts (7), nuts (8), a slide rail (9), a slider (10), and a ball joint (11); the sliding system is composed of a ball bearing (12) and a "U"-shaped slide groove (13); the loading system is composed of a vertical jack (14), a horizontal longitudinal jack (15), a horizontal transverse jack (16), and a reaction box (17); Vertical and horizontal square steel pipes (5) are welded to form upper and lower plate model box frames; a lower bottom plate (1-1) is welded at the bottom of the upper and lower plate model box frames, a partition plate (4) and a nut (8) are welded on the upper surface of the lower bottom plate (1-1), the upper bottom plate (1-2) is connected to the lower bottom plate (1-1) by high-strength bolts (7), a horizontal notch is reserved in the middle of the partition plate (4), a square steel pipe (5) with a horizontal groove is placed between the lower bottom plate (1-1) and the upper bottom plate (1-2), and the square steel pipe (5) and the partition plate (4) are connected and fixed by high-strength bolts (7) and nuts (8) penetrating the horizontal notch; A first end plate (3-1) is welded to the longitudinal end of the model box, and a pipe-sized hole is reserved in the middle of the first end plate (3-1); the second end plate (3-2) is a detachable small steel plate, which seals the end of the model box; high-strength bolt holes are reserved in the first end plate (3-1) and the second end plate (3-2), and are fixed by high-strength bolts (7) and nuts (8); The horizontal longitudinal square steel tubes (5) welded to the first side plate (2-1) are of different lengths; the square steel tubes (5) are connected with ball joints (11) at the sliding surfaces of the upper and lower plate model boxes, one end of the ball joint (11) is fixed to the slider (10), and the other end is fixed to the end surface of the square steel tube (5); the slide rail (9) is welded and fixed to the slide plate (6), and the slider (10) is located inside the slide rail (9) and can slide along the rail; the ball joint (11) at the bottom of the side plate of the model box is directly fixed to the square steel tube (5) and the slide plate (6), so that the slide plate can rotate with the ball joint (11) as the center of the circle; The ball joint (11) in the middle of the bottom plate of the model box is fixed on the square steel tube (5) and the sliding plate (6), so that the sliding plate (6) rotates around the ball joint (11); the angle of the sliding plate (6) is adjusted by changing the longitudinal telescopic length of the square steel tube (5) to simulate different fault dips and the horizontal angle of the pipeline passing through the fault; wherein the horizontal angles of the upper and lower plates are controlled by the embedded lower bottom plate (1-1) and the upper bottom plate (1-2), and the fault dip is fixedly controlled by the embedded second side plate (2-2), and the second side plate (2-2) is made of a light, high-strength and transparent acrylic plate; A plurality of groups of vertical jacks (14) are arranged at the bottom of the model box, and a ball bearing (12) is arranged on the top of the vertical jack (14). The model box slides horizontally on a horizontal plane under the action of the ball bearing (13); a "U"-shaped slide groove (13) is welded and fixed on the outer side of the side wall of the lower plate model box and the outer side of the end of the upper plate model box, and a ball bearing (12) is arranged on the head of the horizontal longitudinal jack (15) and the horizontal transverse jack (16) to reduce friction with the "U"-shaped slide groove (13), so that the vertical displacement is not affected when the upper and lower plate model boxes slide obliquely relative to each other.

2. A test system for simulating multi-angle fault dislocation and pipe-soil interaction according to claim 1, characterized in that: The bottom square steel tube (5) of the side plate of the lower plate model box is long, and the top square steel tube (5) is short. A retractable square steel tube (5) is arranged inside the horizontal longitudinal square steel tube (5) of the side plate; the retractable square steel tube (5) inside the horizontal longitudinal square steel tube (5) of the side wall of the model box is stretched and contracted to form an angle of 45°-90° with the horizontal plane in the vertical direction; the length of the retractable square steel tube (5) is adjusted so that the length of the square steel tube (5) on one side is greater than or equal to the length of the square steel tube (5) on the other side, so that the fault position forms an angle of 45°-90° with the longitudinal direction of the model on the horizontal plane; the upper plate model The welded square steel pipes (5) on the top and bottom of the side plates of the mold box are arranged opposite to the telescopic square steel pipe (5); the length of the horizontal longitudinal square steel pipe (5) on the top of the lower plate mold box is less than or equal to the length of the horizontal longitudinal square steel pipe (5) on the bottom, and the length of the horizontal longitudinal square steel pipe (5) on the top of the upper plate mold box is greater than or equal to the length of the horizontal longitudinal square steel pipe (5) on the bottom; the overlapping parts of the telescopic square steel pipe (5) and the non-telescoping square steel pipe (5) are both provided with slots of a certain length, and high-strength bolts (7) penetrate through the slots and are tightened with nuts (8) to adjust and limit the extension length of the telescopic square steel pipe (5).

3. The test system for simulating multi-angle fault dislocation and pipe-soil interaction according to claim 1, characterized in that: The lower base plate (1-1) of the model box extends out of the outer portion of the box body and is reserved with a slot of a certain length, and a vertically fixed high-strength bolt (7) is inserted into the slot to limit the longitudinal horizontal displacement of the lower plate model box and the lateral horizontal displacement of the upper plate model box when the fault is displaced, and the vertical displacement of the model box is controlled by tightening the nut (8) on the upper surface of the lower base plate (1-1).

4. The test system for simulating multi-angle fault dislocation and pipe-soil interaction according to claim 1, characterized in that: A plurality of groups of vertical jacks (14) are arranged at the bottom of the model box, and horizontal longitudinal jacks (15) and horizontal transverse jacks (16) are arranged at the ends and sides; the telescopic length of the longitudinal square steel pipe (5) at the contact position of the upper and lower plate model boxes is changed to adjust the angle between the sliding plate (6) and the horizontal plane, so as to simulate different fault inclination angles and the horizontal angle of the pipeline crossing the fault; the horizontal longitudinal jack (15) applies longitudinal displacement to the upper plate model box, the horizontal transverse jack (16) applies transverse displacement to the lower plate model box, and the vertical jack (14) applies vertical displacement to the upper and lower plate model boxes respectively; the displacement ratio applied by the vertical jack (14), the horizontal longitudinal jack (15) and the horizontal transverse jack (16) is calculated by the fault plane inclination angle and the pipeline-fault horizontal angle to ensure that the model box slides along the fault plane, and the normal reverse fault, strike-slip fault and oblique-slip fault dislocation forms are simulated by the synergistic action of the three types of jacks.

5. The test system for simulating multi-angle fault dislocation and pipe-soil interaction according to claim 1, characterized in that: The horizontal longitudinal jack (15), the horizontal transverse jack (16), and the vertical jack (17) are fixed to the end, the side wall, and the bottom plate in the reaction box (17) by high-strength bolts (7), and the reaction box (17) is fixed to the vibration table by high-strength bolts (7); firstly, the three types of jacks are used to apply a specified displacement to the upper and lower plate model boxes to simulate the fault displacement phenomenon, and then the displacement is stopped and the existing displacement amount is kept unchanged, and then the nut (8) on the upper surface of the lower bottom plate (1-1) is tightened to limit the vertical movement of the model box, and then the earthquake action is applied to the displacement model in the reaction box (17) by the vibration table.

6. The test system for simulating multi-angle fault dislocation and pipe-soil interaction according to claim 1, characterized in that: The implementation method of the system includes the following steps: Step 1: first fix the reaction box (17) on the vibration table by high-strength bolts (7), fix the vertical jack (14) on the bottom of the reaction box (17) by high-strength bolts (7), and then place the assembled upper and lower plate model boxes on the vertical jack (14) in turn, wherein the notch of the lower bottom plate (1-1) of the model box must pass through the high-strength bolts (7) fixed on the reaction box (17); when the horizontal longitudinal jack (15) and the horizontal transverse jack (16) are installed, the head is located in the "U"-shaped slide groove (16), ensuring that the ball (12) at the head can rotate freely in the "U"-shaped slide groove (16) to reduce the friction resistance and make the model box vertically displaced when it slides obliquely The bottom of the jack is not affected, and is fixed to the reaction box (17) by high-strength bolts (7); the telescopic square steel tube (5) in the horizontal longitudinal square steel tube (5) on both sides of the model box is stretched and contracted to form an inclined angle of 45°-90°; the length of the telescopic square steel tube (5) at the bottom of the model box is adjusted so that the fault position forms an angle of 45°-90° with the longitudinal direction of the pipeline on the horizontal plane; the length of the telescopic square steel tube (5) is fixed by high-strength bolts (7) and nuts (8) to allow the sliding plate (6) to form a certain inclined angle to simulate the fault inclination angle to be tested and the horizontal angle of the pipeline crossing the fault, and the model materials are determined according to the similarity ratio theory to be filled and placed in the model box in sequence; Step 2: Keep the vertical jack (14) at the bottom of the model box fixed, calculate the displacement ratio of the horizontal longitudinal jack (15) and the horizontal transverse jack (16) according to the adjusted angle of the pipeline horizontally crossing the fault, and the horizontal longitudinal jack (15) applies longitudinal displacement to the upper plate model box while the horizontal transverse jack (16) applies transverse displacement to the lower plate model box, so as to simulate the pipe-soil interaction under the strike-slip fault dislocation when the pipeline crosses the fault; Step 3: The lower plate model box is fixed, and the displacements required to be applied by the vertical jacks (14) and the horizontal longitudinal jacks (15) at the upper plate model box are calculated according to the fault dip angle adjusted in the test, and then the vertical jacks (14) and the horizontal longitudinal jacks (15) are used together to apply longitudinal and vertical displacements to the upper plate model box to simulate the reverse fault dislocation of the pipe soil along a certain dip angle; Step 4: Ensure that the vertical jack (14) at the bottom of the upper plate model box is fixed, calculate the displacement required to be applied by the vertical jack (14) at the lower plate model box and the horizontal longitudinal jack (15) at the upper plate model box according to the fault dip angle adjusted in the test, and move the vertical jack (14) at the bottom of the lower plate model box upward while the horizontal longitudinal jack (15) at the upper plate moves toward the reaction box (17), and the two work together to simulate the normal fault displacement of the pipe soil along a certain dip angle; Step 5: Calculate the displacement values ​​of the vertical jack (14), the horizontal longitudinal jack (15), and the horizontal transverse jack (16) according to the adjusted fault inclination and the pipe-fault horizontal angle, so as to ensure that the upper and lower plate model boxes can slide along the fault plane; the horizontal transverse jack (16) applies transverse displacement to the lower plate model box, while the vertical jack (14) and the horizontal longitudinal jack (15) at the upper plate model box apply vertical and horizontal longitudinal displacements to the upper plate model box, and the synergistic effect of the three jacks can simulate the oblique sliding dislocation of the pipe soil along a certain inclination angle; Step 6: After the model fault displacement is completed, the high-strength bolts (7) passing through the grooves of the lower base plate (1-1) of the model box are tightened by nuts (8), so that the model box is firmly fixed on the reaction box (17) under the upward jacking force of the vertical jack (14) and the downward tightening force of the nuts (8) on the lower base plate (1-1); then, seismic motion is applied to the model to simulate the soil response of the pipe under the coupling of fault displacement and seismic motion.

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