Simulation test device for pipeline leakage in composite stratum

Abstract

The utility model belongs to the technical field of pipeline leakage simulation tests, and relates to a pipeline leakage simulation test device in a composite stratum, which comprises a box body, a pipeline, a water pump and a water collecting tank, the box body is connected with a water pump through a pipeline; a composite stratum is arranged in the box body, and a crack is formed in the pipeline, so that liquid in the pipeline leaks to the composite stratum, and the phenomenon that the liquid flows around the crack around the pipeline is generated; performing a simulation test according to the pipe periphery streaming phenomenon; the pipeline comprises a water inlet pipe, a water outlet pipe and an in-box pipe; the water pump, the water inlet pipe, the in-tank pipe, the water outlet pipe and the water collecting tank are sequentially connected, so that flowing water continuously flows in the pipeline and forms dynamic water circulation; the pipeline further comprises an out-box pipe. The two ends of the box outer pipe are connected with the two ends of the box inner pipe correspondingly, so that flowing water is continuously static in the pipeline and forms a static state. According to the invention, a multi-factor and dual-channel pipeline leakage simulation test can be carried out.

Description

Technical Field

[0001] This application relates to the technical field of pipeline leakage simulation tests, and particularly to a pipeline leakage simulation test device in a composite stratum. Background Art

[0002] Cracks are one of the common structural diseases in underground drainage pipelines. The aggravation of this damage will lead to pipeline leakage and even rupture, which will not only endanger the safe and stable operation of the entire industrial automation system, but even cause serious consequences such as ecological pollution and ground damage. Therefore, exploring the evolution mechanism of cracks in existing drainage pipelines plays a decisive role in the safe operation of underground pipelines and ground roads. In addition, engineering practice has found that not all drainage pipe leaks can directly infiltrate the soil. Under the combined action of finger flow and macropore flow, drainage pipe leaks may form circumferential flow around the pipe, that is, in a stratum with a high permeability difference, the fluid does not necessarily directly infiltrate the soil around the pipe, but flows around the pipe, and the transformation of circumferential flow to finger flow is one of the important factors causing ground collapse.

[0003] In the prior art, a main research method for studying the influence of pipeline leakage on the surrounding soil is indoor physical model tests, and usually the data obtained through monitoring reflects the changes in soil microscopic indices and macroscopic states.

[0004] However, the current such physical model test devices have the following deficiencies:

[0005] 1) Most of the existing models have variables such as water flow rate and pressure difference, and the influence of other factors has not been considered yet;

[0006] 2) For most of the existing models, sensors are used to monitor soil parameters, and the data is not accurate enough;

[0007] 3) The existing model's water inlet device and water outlet device are relatively separated, and the recycling of water resources cannot be realized;

[0008] 4) Most of the existing model devices study the seepage state of crack water in the soil, and the circumferential flow state has not been involved yet. Utility Model Content

[0009] Based on this, in view of the above technical problems, it is necessary to provide a pipeline leakage simulation test device in a composite stratum, which can perform multi-factor and dual-channel pipeline leakage simulation tests.

[0010] A pipeline leakage simulation test device in a composite stratum includes: a box body, a pipeline, a water pump, and a water collection tank;

[0011] The box body is connected to the water pump through the pipeline, and the water pump is arranged in the water collection tank;

[0012] The box body is provided with a composite formation, and the pipeline is provided with cracks, so that the liquid in the pipeline leaks into the composite formation, and a circumferential flow phenomenon around the pipeline is generated around the cracks;

[0013] A simulation test is carried out according to the circumferential flow phenomenon around the pipeline.

[0014] In one embodiment, the pipeline includes: a water inlet pipe, a water outlet pipe, and an in-box pipe;

[0015] The water pump, the water inlet pipe, the in-box pipe, the water outlet pipe, and the water collection tank are connected in sequence, so that the flowing water continuously flows in the pipeline and forms a dynamic water cycle.

[0016] In one embodiment, the pipeline further includes: an out-box pipe;

[0017] Both ends of the out-box pipe are respectively connected to both ends of the in-box pipe, so that the flowing water continuously remains static in the pipeline and forms a static state.

[0018] In one embodiment, it further includes: a first valve, a second valve, a third valve, and a fourth valve;

[0019] The first valve and the second valve are respectively arranged at both ends of the out-box pipe;

[0020] The third valve is arranged at one end of the in-box pipe connected to the water inlet pipe. Taking the connection point between the out-box pipe and the in-box pipe close to the water inlet pipe as the first point, the distance between the third valve and the water inlet pipe is greater than the distance between the first point and the water inlet pipe;

[0021] The fourth valve is arranged at one end of the in-box pipe connected to the water outlet pipe. Taking the connection point between the out-box pipe and the in-box pipe close to the water outlet pipe as the second point, the distance between the fourth valve and the water outlet pipe is less than the distance between the second point and the water outlet pipe.

[0022] In one embodiment, when the first valve and the second valve are closed and the third valve and the fourth valve are opened, the flowing water continuously flows in the pipeline;

[0023] When the first valve and the second valve are opened and the third valve and the fourth valve are closed, the flowing water continuously remains static in the pipeline.

[0024] In one embodiment, when the first valve and the second valve are closed and the third valve and the fourth valve are opened, both the water inlet pipe and the water outlet pipe are faucets, so as to change the flow velocity difference between the incoming and outgoing water by controlling the incoming and outgoing water flow velocities, thereby generating the internal pressure of the pipe, and changing the seepage state of the liquid in the pipeline by adjusting the pressure magnitude.

[0025] In one embodiment, it further includes: a plurality of circuit boards; the circuit boards are all rectangular structures and are divided into two groups;

[0026] Both ends of the box body are provided with clamping grooves, the clamping grooves are rectangular structures, and the height of the clamping grooves is equal to the height of the box body;

[0027] The width of each group of circuit boards is respectively equal to the width of one clamping groove, so that the two groups of circuit boards are respectively arranged in the two clamping grooves in an array; there is a loading groove on one circuit board in each group of circuit boards, so that both ends of the inner pipe of the pipeline in the box pass through the loading groove and extend out of the box body.

[0028] In one embodiment, the cracks include: longitudinal cracks and / or circumferential cracks.

[0029] In one embodiment, it further includes: an optical fiber sensor;

[0030] The optical fiber sensor is arranged in the box body and is placed in different regions.

[0031] In one embodiment, the composite stratum is two soil layers with a difference in permeability coefficient of 9 - 10 m / d;

[0032] The box body and one of the soil layers are both made of transparent materials, and the liquid in the pipeline has a color different from that of the composite stratum.

[0033] The above-mentioned pipeline leakage simulation test device in a composite stratum is a multi-factor (including: comprehensive influence of water flow rate, pressure difference, pipeline size, uplift inclination angle, crack type, water flow state, etc.), two-channel simulation test device suitable for burying leaking PE pipelines in composite strata with large differences in permeability, which can study the damage mechanism of pipeline leakage to the soil body, can set different variable conditions and influencing factors to simulate the seepage and bypass flow conditions of pipeline crack leakage in composite strata with high permeability differences, observe the changes in physical properties of the composite stratum before and after through a transparent test box and colored water flow, obtain the particle trajectories and erosion processes in the fluidized zone, master the damage law of the circumferential flow phenomenon around the pipeline during pipeline leakage to the surrounding geological body, and lay a foundation for further solving social problems such as the deterioration of the soil body performance around the pipeline caused by pipeline crack diseases, soil body failure, and road surface collapse. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of a pipeline leakage simulation test device in a composite stratum in one embodiment;

[0035] Figure 2 It is a schematic diagram of a pipeline crack in one embodiment, where (a) is a schematic diagram of a longitudinal crack and (b) is a schematic diagram of a circumferential crack;

[0036] Figure 3Schematic diagram of the box body and the board card in an embodiment;

[0037] Figure 4 Schematic diagram of the cooperation process between the box body and the board card in an embodiment;

[0038] Figure 5 Schematic diagram showing the completion of the cooperation between the box body and the board card in an embodiment.

[0039] Reference numerals:

[0040] Test chamber 1, box body 11, board card 12;

[0041] Pipe 2, water inlet pipe 21, water outlet pipe 22, inner box pipe 23, outer box pipe 24;

[0042] First valve 31, second valve 32, third valve 33, fourth valve 34;

[0043] Liquid module 4, water pump 41, water collection tank 42;

[0044] Data module 5;

[0045] Longitudinal seam A, circumferential seam B. Detailed implementation manners

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0047] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, in the present application, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "multiple groups" is at least two groups, such as two groups, three groups, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise clearly specified or limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, a physical connection or a wireless communication connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In addition, the technical solutions between various embodiments of this application can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0051] This application provides a pipeline leakage simulation test device in a composite stratum, as Figures 1 to 3 shown. In one embodiment, it includes: a test box, a pipeline, a valve module, a liquid module, and a data module.

[0052] 1) The test box includes: a box body and a board card, which are used to carry the composite stratum and conduct pipeline leakage simulation tests.

[0053] The box body is arranged on the simulation test platform and is a box-shaped structure with an open top, and an accommodation cavity is formed inside to place the composite stratum. Card slots are provided on both ends, that is, on two opposite side surfaces of the box body. The card slots are rectangular structures, and the height of the card slots is equal to the height of the box body. Of course, a sliding cover can also be provided at the opening of the box body to facilitate soil filling.

[0054] The boards are all rectangular structures, and the number of them is multiple and divided into two groups. In one group of boards, the widths of all the boards are equal to the width of one card slot, so as to form a linear array with the same width as one card slot. In the other group of boards, the widths of all the boards are equal to the width of another card slot, so as to form a linear array with the same width as the other card slot. The two linear arrays are respectively arranged in the corresponding card slots, so as to form a receiving cavity inside the box body for placing the composite formation. In each group of boards, there is a board with a loading slot, and the size of the loading slot matches the size of the inner pipe in the box, so that both ends of the inner pipe in the pipe extend out of the box body after passing through the loading slot. The position of the board with the loading slot in the corresponding card slot can be moved, so that the heights of both ends of the inner pipe in the box are different, thereby forming different inclination angles between the inner pipe in the box and the simulation test platform, and changing the state of the pipeline being fed. It should be noted that: the present application does not limit the number of boards, and the number of boards in the two groups of boards can be equal or unequal; the present application also does not limit the height of the boards, and the heights of different boards can be equal or unequal; the present application also does not limit the width of the card slots, and the widths of the two card slots can be equal or unequal; the present application also does not limit the diameter of the loading slot to match different inner pipes in the box; the above settings increase a variety of simulation test conditions and improve the diversity and flexibility of the simulation test. It should be noted that: the inlay method of the board and the card slot belongs to the prior art. For example: the inlay method of using a drawer guide rail. Specifically, symmetric recesses are provided on both sides of the card slot as sliding grooves, and symmetric protrusions are provided on both sides of the board as sliding rails. The sliding rails correspond to the sliding grooves one by one, and the sliding rails are arranged in the corresponding sliding grooves, and the sliding rails can slide back and forth in the sliding grooves along the height direction of the box body, so as to realize the inlay or separation of the board and the card slot. This plate-type linear motion guide rail adopts a thin and compact design. In addition to realizing sliding, it also bears the pressure of the formation inside the box, and at the same time cleverly reduces friction, with low cost, high strength, simple structure and high durability.

[0055] 2) The pipeline includes: a water inlet pipe, a water outlet pipe, an inner pipe in the box, and an outer pipe outside the box, which are used for liquid transmission.

[0056] One end of the water inlet pipe is connected to the water pump, and the other end of the water inlet pipe is connected to one end of the inner pipe in the box.

[0057] One end of the water outlet pipe is connected to the water collecting tank, and the other end of the water outlet pipe is connected to the other end of the inner pipe in the box.

[0058] One end of the inner pipe in the box is connected to the other end of the water inlet pipe, and the other end of the inner pipe in the box is connected to the other end of the water outlet pipe. Cracks are provided at both ends of the inner pipe in the box close to the inner wall of the box body. According to the existing common pipeline disease types, the cracks include: longitudinal crack A and / or circumferential crack B. The present application does not limit the number of cracks, and different crack combinations can be specifically set according to the actual situation, which will not be elaborated here.

[0059] One end of the tube outside the box is connected to one end of the tube inside the box, and the other end of the tube outside the box is connected to the other end of the tube inside the box.

[0060] Among them, the water inlet pipe and the water outlet pipe can choose soft hoses, the pipe inside the box and the pipe outside the box can be replaced in conjunction with the loading slot of the board, and the connection between the water inlet pipe, the pipe inside the box and the pipe outside the box can choose a three-dimensional tee.

[0061] 3) The valve module includes: a first valve, a second valve, a third valve and a fourth valve, which are used to control the opening and closing of the pipeline.

[0062] The first valve is arranged at one end of the pipe outside the box.

[0063] The second valve is arranged at the other end of the pipe outside the box.

[0064] The third valve is arranged at one end of the inner tube connected to the water inlet pipe, with the connection point between the outer tube and the inner tube close to the water inlet pipe as the first point, and the distance between the third valve and the water inlet pipe is greater than the distance between the first point and the water inlet pipe.

[0065] The fourth valve is arranged at one end of the inner tube connected to the outlet pipe, with the connection point between the outer tube and the inner tube close to the outlet pipe as the second point, and the distance between the fourth valve and the outlet pipe is smaller than the distance between the second point and the outlet pipe.

[0066] 4) The liquid module includes: a water pump and a water collecting tank, which are used for drainage and collection of liquid.

[0067] The water pump is installed in the water collecting tank and connected to one end of the water inlet pipe. A variable frequency water pump can be selected.

[0068] The water collecting tank is arranged on the simulation test platform and is spaced apart from the box body.

[0069] 5) The data module includes: optical fiber sensor, flow meter and processor, which are used for data detection, collection and processing.

[0070] The optical fiber sensor is installed in the box and placed in different areas, that is, a distributed design is adopted, which has the advantages of many sensing points, high sensing density and no blind spots, distributed, high precision, real-time, corrosion resistance, and electromagnetic interference resistance, and can efficiently and accurately observe the dynamic changes of soil-related indexes. There are multiple rectangular rings set up layer by layer in the composite stratum to form a "U"-shaped structure. The optical fiber sensor is fixed on the rectangular ring using existing technologies such as glue. The heights of different rectangular rings are different to more comprehensively observe the dynamic changes of soil-related indexes.

[0071] The flow meter is installed on the water inlet pipe and the water outlet pipe to detect the liquid flow of the water inlet and the water outlet. Specifically, an ultrasonic flow meter can be selected.

[0072] The processor may be a computer, which is connected to the optical fiber sensor and the flow meter respectively.

[0073] In this embodiment, the composite stratum is composed of two or more soil layers with a difference in permeability coefficient of 9 - 10 m / d, and cracks are provided on the inner pipe of the box to allow the liquid in the pipeline to leak into the composite stratum, and a circumferential flow phenomenon around the pipe is generated around the cracks (the circumferential flow phenomenon around the pipe refers to the phenomenon that the seepage through the cracks does not directly penetrate into the soil around the pipe, but flows around the pipeline), so that a simulation test can be carried out according to the circumferential flow phenomenon around the pipe.

[0074] The water pump, the inlet pipe, the inner pipe of the box, the outlet pipe and the water collecting tank are connected in sequence, and both ends of the outer pipe of the box are respectively connected to both ends of the inner pipe of the box, so as to form dynamic and static simulation test conditions together with the water pump and the water collecting tank.

[0075] Preferably, the box body and one of the soil layers are made of transparent materials (such as acrylic), and the liquid in the pipeline has a different color from that of the composite stratum (such as adding blue soluble water-based environmentally friendly color paste to the liquid in the water collecting tank) to make the circulating fluid blue, so as to conveniently observe the circumferential flow phenomenon around the pipe and observe the movement trajectory of the colored seepage in the soil.

[0076] In a specific embodiment: the box body is made of acrylic material, with dimensions of 70 cm × 50 cm × 50 cm, and the card slot has dimensions of 10 cm × 50 cm; the board is made of acrylic material, with dimensions of 10 cm × 10 cm × 2 cm, and the diameter of the loading slot on the board is 40 mm, 32 mm or 25 mm; the pipeline is made of PE plastic material, and the outer diameter is between 25 mm and 40 mm.

[0077] The working process of this application is as follows:

[0078] S1. Selection of composite stratum:

[0079] Take two soil layers with a large difference in permeability (the difference in permeability coefficient is 9 - 10 m / d). Due to advantages such as transparent particles, convenient observation, and no chemical reaction, acrylic particles can be used to replace the soil layer with relatively large permeability;

[0080] Dry the soil at 100°C - 120°C for 24 - 48 hours, crush and grind the dried soil, and sieve it respectively. Sieve out soil particles smaller than 2 mm and acrylic particles larger than 3 mm, measure the soil gradation, and obtain two groups of soils with large differences in gradation, namely the well-graded soil layer and the poorly-graded soil layer.

[0081] S2. Laying of composite stratum:

[0082] For the two groups of soils with large differences in gradation, bury them in the acrylic box according to the principle of "the well-graded soil layer on the outside and the poorly-graded soil layer on the inside", and the soil is arranged symmetrically up, down, left and right with the PE inner pipe in the box as the axis of symmetry.

[0083] S3. Change in water flow state:

[0084] When the first valve and the second valve are closed and the third valve and the fourth valve are opened, the liquid in the pipeline flows from the water collection tank through the water pump successively through the water inlet pipe, the inner pipe in the tank and the water outlet pipe, and finally returns to the water collection tank, and continues to carry out water circulation, so that the flowing water continuously flows in the pipeline, forming the simulation test conditions of dynamic water circulation; at this time, the flow rate can be adjusted by a variable-frequency water pump.

[0085] Both the water inlet pipe and the water outlet pipe are faucets, so as to change the flow rate difference between the inlet and outlet water by controlling the inlet and outlet water flow rates, thereby generating the internal pressure of the pipe, and changing the seepage state of the liquid in the pipeline by adjusting the pressure magnitude.

[0086] When the first valve and the second valve are opened and the third valve and the fourth valve are closed, the liquid in the pipeline flows from the water collection tank through the water pump successively through the water inlet pipe, the outer pipe outside the tank and the inner pipe in the tank. Finally, the water inlet pipe, the outer pipe outside the tank and the inner pipe in the tank are all in a full water state, and the water pump is closed, so that the flowing water remains static in the pipeline, forming static simulation test conditions.

[0087] The flowing water or static water seeps out through the cracks in the inner pipe in the acrylic box body and enters the composite stratum.

[0088] S4. Change in other factors:

[0089] Change the water flow state through the valve, adjust the inlet water flow rate through the variable-frequency water pump, control the pipeline inclination angle by moving the acrylic plate with a loading groove stuck in the card slot, change the seepage state by rotating the pipeline to change the distribution position of the cracks in the soil body, select different pipelines through the combination of the area of the acrylic plate card and the pipeline type, change the water seepage state by making different cracks, etc.

[0090] S5. Observation and evaluation:

[0091] During the experiment, observe on the computer. The numerical values of the optical fiber sensors in the box body change in real time dynamically. Observe the numerical values of the ultrasonic flowmeters arranged in the water inlet pipe and the water outlet pipe. After each experiment, test the physical parameters of the composite stratum in the acrylic box body, observe the change of the physical properties parameters before and after the composite stratum, obtain the particle trajectory and erosion process in the fluidized zone, and master the damage law of pipeline leakage to the surrounding geological body, laying a foundation for further solving problems such as the deterioration of the soil body performance around the pipe, soil body failure and road surface collapse caused by pipeline crack diseases.

[0092] The above-mentioned pipeline leakage simulation test device in a composite stratum is a multi-factor (including the comprehensive influence of water flow rate, pressure difference, pipeline size, uplift inclination angle, fracture type, water flow state, etc.), two-channel simulation test device applicable to burying leaking PE pipelines in composite strata with large differences in permeability. It can study the failure mechanism of soil caused by pipeline leakage, set different variable conditions and influencing factors to simulate the seepage and flow-around conditions of pipeline crack leakage in composite strata with high permeability differences. Through a transparent test box and colored water flow, observe the changes in physical properties of the composite stratum before and after, obtain the particle trajectories and erosion processes in the fluidized zone, and master the damage law of the flow-around phenomenon around the pipeline to the surrounding geological body during pipeline leakage, laying a foundation for further solving social problems such as the deterioration of soil properties around the pipeline, soil failure, and road surface collapse caused by pipeline crack diseases. Specifically: A leakage pipe body simulation model under limited engineering geological conditions is designed, and a composite stratum with a large difference in permeability is laid in an acrylic box to limit the conditions of the composite stratum with high permeability differences and simulate the flow-around phenomenon around the pipeline; A pipeline combination is designed, which can simulate two states of continuous fluid flow in the pipeline and static state in the pipeline after water inflow through the control of different valves. At the same time, the pressure in the pipeline can be controlled by a faucet, and by changing the size and position of the plate with a loading groove, different pipeline outer diameters can be adapted, and the inclination angle of the pipeline can be changed, so as to be able to test the influence of crack seepage of pipelines with different diameters at different inclination angles on the surrounding composite soil layers under the two water flow states of dynamic water flow and static water flow; The water flow rate is adjusted by a variable frequency water pump, breaking through the limitation of a single factor of the conventional leaking pipeline and soil platform in the past, and achieving the efficient utilization of the platform; Fiber optic sensors are arranged in the acrylic box, which can observe the dynamic changes of relevant soil indexes, more accurately monitor the changes in physical properties of the composite soil body, change the disadvantages of traditional sensors such as being bulky, large in volume, and insensitive to receiving signals, and enhance the sensitivity and real-time transmission rate of signal sensing; The water collecting tank is simultaneously connected to the water inlet pipe and the water outlet pipe to realize the circulating flow of the liquid medium, and the integration of the water inlet device and the water outlet device is used to realize the recycling of water resources, laying a foundation for green environmental protection tests.

[0093] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0094] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pipeline leakage simulation test device in a composite formation, characterized in that: include: Tanks, pipes, water pumps and water collection tanks; The box body is connected to the water pump through the pipeline, and the water pump is arranged in the water collecting tank; A composite formation is provided in the box, and cracks are provided on the pipe, so that the liquid in the pipe leaks into the composite formation and generates a circumferential flow around the cracks; A simulation test is carried out based on the flow phenomenon around the pipe.

2. A pipeline leakage simulation test device in a composite formation according to claim 1, characterized in that: The pipeline includes: a water inlet pipe, a water outlet pipe and a pipe inside the box; The water pump, the water inlet pipe, the inner pipe of the box, the water outlet pipe and the water collecting box are connected in sequence so that the flowing water can continuously flow in the pipe and form a dynamic water circulation.

3. A pipeline leakage simulation test device in a composite formation according to claim 2, characterized in that: The pipeline also includes: an outer tube of the box; The two ends of the outer tube of the box are respectively connected to the two ends of the inner tube of the box, so that the flowing water in the pipeline remains still and forms a static state.

4. A pipeline leakage simulation test device in a composite formation according to claim 3, characterized in that: Also includes: a first valve, a second valve, a third valve, and a fourth valve; The first valve and the second valve are respectively arranged at two ends of the outer tube of the box; The third valve is arranged at one end of the inner tube of the box connected to the water inlet pipe, with the connection point between the outer tube of the box and the inner tube of the box close to the water inlet pipe as the first point, and the distance between the third valve and the water inlet pipe is greater than the distance between the first point and the water inlet pipe; The fourth valve is arranged on one end of the inner tube of the box connected to the water outlet pipe, and the connection point between the outer tube of the box and the inner tube of the box close to the water outlet pipe is taken as the second point. The distance between the fourth valve and the water outlet pipe is smaller than the distance between the second point and the water outlet pipe.

5. A pipeline leakage simulation test device in a composite formation according to claim 4, characterized in that: When the first valve and the second valve are closed and the third valve and the fourth valve are opened, the flowing water continues to flow in the pipeline; When the first valve and the second valve are opened and the third valve and the fourth valve are closed, the flowing water continues to be stationary in the pipeline.

6. A pipeline leakage simulation test device in a composite formation according to claim 5, characterized in that: When the first valve and the second valve are closed and the third valve and the fourth valve are opened, the water inlet pipe and the water outlet pipe are both faucets, so as to change the inlet and outlet flow rate difference by controlling the inlet and outlet water flow rates, thereby generating pressure in the pipe, and changing the seepage state of the liquid in the pipe by adjusting the pressure magnitude.

7. A pipeline leakage simulation test device in a composite formation according to any one of claims 1 to 6, characterized in that: Also includes: Multiple boards; The boards are all rectangular in structure and are divided into two groups; Both ends of the box body are provided with card slots, the card slots are rectangular in structure, and the height of the card slots is equal to the height of the box body; The width of each set of boards is equal to the width of one card slot, so that two sets of boards are arrayed in two card slots respectively; A loading slot is provided on one of the board cards in each group of the board cards, so that the two ends of the tube inside the box in the pipeline pass through the loading slot and extend out of the box.

8. A pipeline leakage simulation test device in a composite formation according to any one of claims 1 to 6, characterized in that: The cracks include longitudinal cracks and / or annular cracks.

9. A pipeline leakage simulation test device in a composite formation according to any one of claims 1 to 6, characterized in that: Also includes: Fiber optic sensors; The optical fiber sensors are arranged in the box and placed in different areas.

10. A pipeline leakage simulation test device in a composite formation according to any one of claims 1 to 6, characterized in that: The composite stratum is a soil layer with two permeability coefficients differing by 9-10 m / d; The box body and the soil layer are both made of transparent materials, and the liquid in the pipeline has a color different from that of the composite stratum.

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