Road collapse test system and method

Abstract

The present invention relates to a road collapse test system and method, including a water collecting tank, a model box, a cyclic load device, an image monitoring device, an isobaric water tank, a rainfall device, a plurality of pipelines, a quality monitoring device and a disease hydraulic device. The water collecting tank provides the circulation of rainwater and pipeline water, and collects pipeline drainage; a plurality of pipelines are buried inside the model box to realize the laying of road strata, stratum pipelines and road surfaces; the cyclic load device provides cyclic loads on the road surface; the image monitoring device records the deformation of the road surface during the whole test process; the isobaric water tank provides pipeline water for the pipeline; the rainfall device provides rainfall simulation; the quality monitoring device records the quality change of the model box; and the disease hydraulic device arranges the disease types inside the model box. The present invention realizes the simulation test of multiple environmental conditions of urban roads, makes up for the one-sidedness of the traditional single environmental model test, and improves the accuracy and reliability of the record of the characteristics of the development of disasters in the leakage pipeline.

Description

Technical Field

[0001] The invention belongs to the field of road testing, and in particular relates to a road collapse test system and method. Background Art

[0002] In the existing technology, underground pipeline leakage causes soil erosion in the roadbed, causing road collapse, which seriously threatens the lives and property safety of urban residents. Using the stratum collapse model test, the process from pipeline leakage to the formation of underground hidden dangers and the formation of diseased bodies, which further causes road collapse, is one of the important means to study the mechanism of collapse caused by leaking pipelines.

[0003] The basic principle of the stratum collapse model currently used is to bury pipelines in small-scale boxes, record the development status of the soil around the pipelines, and realize the process record of the evolution of the leakage pipeline model. Under small-scale conditions, the process record of the development of leakage pipelines can be realized, but the model currently used is a multi-dimensional semi-divided model, and the surrounding environment of the underground pipelines of the road is not considered enough, resulting in the collapse physical model law that only considers the erosion of the leakage pipeline. The feedback on the mechanism of collapse caused by erosion and leakage of urban roads is somewhat one-sided, which is very easy to produce deviations in the collapse results of leakage pipelines in complex environment roads, leading to misjudgment of engineering cases and even causing unpredictable safety hazards.

[0004] With the acceleration of urban renewal, the safe service of urban roads is crucial to the personal safety of urban residents. The stratum collapse model is used to deduce the collapse mechanism of urban roads caused by erosion and leakage, explore the law of stratum density reduction and road deformation, and reflect the development state of underground disease bodies in urban roads in complex environments. It has received more and more attention and recognition in academic and engineering field applications. Therefore, it is urgent to study a road collapse test system and test method. Summary of the invention

[0005] In order to overcome the above problems existing in the prior art, the present invention provides a road collapse test system and method for solving the above problems existing in the prior art.

[0006] A road collapse test system, comprising a water collecting tank, a model box, a cyclic load device, an image monitoring device, an isobaric water tank, a rainfall device, several pipelines, a quality monitoring device and a disease hydraulic device.

[0007] The water collecting tank is connected to the isobaric water tank, pipeline and rainfall device to provide the circulation of rainwater and pipeline water during the test and collect the drainage of the pipeline;

[0008] A plurality of pipelines are buried inside the model box to achieve the laying of road strata, stratum pipelines and road surface;

[0009] The cyclic load device is located above the model box and is used to provide a cyclic load of a road vehicle;

[0010] The image monitoring device is located directly above the model box and is used to record the deformation of the road surface during the entire experiment;

[0011] The isobaric water tank is located at the upper rear of the model box and is used to provide pipeline water for the pipeline;

[0012] The rainfall device is used to provide rainfall simulation;

[0013] The quality monitoring device is used to record the quality changes of the model box during the test;

[0014] The disease hydraulic device is used to arrange different disease types inside the model box.

[0015] According to the aspects described above and any possible implementation methods, an implementation method is further provided, which also includes a rainwater delivery pipeline, a pipe water delivery pipeline, an isobaric tank water recovery pipeline and a pipe water recovery pipeline, wherein one end of the rainwater delivery pipeline is connected to the water collecting tank, and the other end is connected to the rainfall device; one end of the pipe water delivery pipeline and the isobaric water tank recovery pipeline are both connected to the water collecting tank, and the other end is both connected to the isobaric water tank; one end of the pipe water recovery pipeline is connected to the water collecting tank, and the other end is connected to the pipeline.

[0016] According to the above aspects and any possible implementation, an implementation is further provided, which also includes a leakage water collector and a leakage water collector box arranged at the bottom of the model box, which are used to collect the leakage water and sediment in the model box.

[0017] According to the aspects described above and any possible implementation methods, an implementation method is further provided, wherein the water collecting tank includes a pipe water delivery pipe interface, a rainwater delivery pipe interface, an isobaric box water recovery pipe interface, a pipe water recovery pipe interface, a pipe water delivery control module, a pipe water delivery start switch, a pipe water delivery flow control valve, a rainwater delivery pipe control module, a rainwater delivery pipe start switch and a rainwater delivery pipe flow control valve, wherein the pipe water delivery pipe interface is connected to the pipe water delivery pipeline, and the pipe water delivery start switch is controlled by the pipe water delivery control module to realize pipeline water delivery, and the water volume of the pipeline water is controlled by the pipe water delivery flow control valve; the rainwater delivery pipe interface is connected to the rainwater delivery pipeline, and the rainwater delivery pipe start switch is controlled by the rainwater delivery pipe control module to realize model rainwater delivery, and the water volume of the rainwater is controlled by the rainwater delivery pipe flow control valve.

[0018] According to the aspects described above and any possible implementation methods, an implementation method is further provided, wherein the model box includes a plurality of baffles and brackets, wherein the front baffle is made of a transparent acrylic plastic plate, and the left, right and rear baffles are all made of steel plate materials, and are all fixed to the brackets by threads, and pipeline fixtures are arranged in the front and rear baffles for fixing and installing the pipelines; the rear baffle includes upper, middle and lower baffles.

[0019] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the isobaric water tank includes a bracket, an isobaric water injection plate, a water injection box body and an isobaric water supply pipeline, wherein the bracket is connected to the water injection box body, and the water injection box body and the isobaric water supply pipeline are connected via internal threads; the isobaric water injection plate and the pipeline water supply pipeline are connected via internal threads.

[0020] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the leakage water bundler is made of steel material, and includes a water and soil bundle funnel and a leakage water bundle pipeline; the water and soil bundle funnel is connected to the leakage water bundle box through the leakage water bundle pipeline; the leakage water bundle box includes a leakage water collection box and a bundle control switch.

[0021] According to the aspects described above and any possible implementation, an implementation is further provided, which also includes a disease hydraulic controller, the disease hydraulic device includes a hydraulic jack and a hydraulic pipeline, and the hydraulic jack is connected to the disease hydraulic controller through the hydraulic pipeline.

[0022] The present invention provides a test method for a road collapse test system, comprising the following steps:

[0023] S1. Assemble the model box, lay the ground in it and install all the pipelines in the ground;

[0024] S2. After the laying is completed in the model box, let it stand for a period of time until the model stratum is stable, start the disease hydraulic controller to adjust the descending position of the disease hydraulic device, and set the model road underground disease type;

[0025] S3. Start the high-definition video monitoring device and the quality monitoring controller to record the deformation of the test road surface in the model box and the quality change of the model box;

[0026] S4. Turn on the rainwater delivery pipe start switch and the rainwater delivery pipe flow control valve to transport the water in the water collection tank to the rainfall device to achieve rainfall simulation;

[0027] S5. Turn on the pipeline water delivery start switch and the pipeline water delivery flow control valve, transport the water in the water collection tank to the isobaric water tank, evenly inject the water into the water injection tank, inject the water into each pipeline through the isobaric water delivery pipeline, and finally return the water to the water collection tank through the pipeline water recovery pipeline to realize pipeline water simulation;

[0028] S6. Start the cyclic load device to adjust the road surface cyclic vehicle load and rate to reach a predetermined load and a predetermined rate, so as to realize the effect of the cyclic load on the road stratum;

[0029] S7. Turn on the cluster control switch to collect the leaking water and soil in the model box 6 in the leaking water cluster, and then merge into the leaking water collection box to achieve the collection of pipeline leaking water and sediment;

[0030] S8. During the test, the mass change of the model box is recorded and stored until the road surface collapses in the model box and the test is terminated.

[0031] According to the above aspects and any possible implementation, an implementation is further provided, in which a method for calculating the water-soil density drop of a leaking pipeline is as follows:

[0032] (1) Record the test mass of the model water tank as G. With the effect of the leaking pipeline, the mass G changes to G1 due to soil erosion at time t1. Record t2, t3, t4…t in sequence. n The mass of the model water tank at this moment is G2, G3, G4…G n In addition, the total volume V of the model water tank remains unchanged, so the initial density can be expressed as: ρ = G / V, and the current density is: ρ n =G n / V, then Δρ=ρ-ρ n =(GG n ) / V;

[0033] (2) Define the soil density drop of the leaking pipeline as the change in density per unit time, then the soil density drop D satisfies:

[0034]

[0035] Beneficial effects of the present invention

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The test system of the present invention can realize simulation tests of various environmental conditions (rainfall, pipeline leakage, cyclic load) of urban roads, which makes up for the one-sidedness of traditional single environmental model tests and improves the accuracy and reliability of recording the characteristics of the development of leaky pipeline disasters;

[0038] (2) The isobaric water tank provides isobaric water flow to the five pipelines simultaneously, achieving the consistency of the water flow pressure, flow rate and flow velocity environment of the drainage pipelines in the model water tank test, ensuring the same variables of the test pipelines and avoiding the occurrence of quality data recording errors caused by inconsistent test environment conditions;

[0039] (3) The quality monitoring device is combined with the density drop calculation formula to realize the continuous monitoring of the density drop of the formation leakage pipeline collapse model, enriching the soil and water loss monitoring indicators of the test model formation and improving the effectiveness of data monitoring of the entire road collapse process;

[0040] (4) The pipeline holder is sealed with the model baffle using transparent rubber material. By replacing rubber ring devices of different diameters in the pipeline holder, pipelines of different diameters can be fixed, which improves the applicability of the test model pipeline application scenarios and avoids the occurrence of water leakage, sand leakage and other phenomena caused by different pipeline diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0042] Figure 2 is a schematic side view of the overall structure of an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of the overall structure of a water collecting tank according to an embodiment of the present invention;

[0044] Figure 4 is a front view structural plan view of a model box body according to an embodiment of the present invention;

[0045] Figure 5 is a schematic plan view of the rear structural view of a model box body according to an embodiment of the present invention;

[0046] Figure 6 2 is a schematic plan view of the steel plate structure at the bottom of the model box according to an embodiment of the present invention;

[0047] Figure 7 is a front view structural plan view of an isobaric water tank according to an embodiment of the present invention;

[0048] Figure 8 It is a schematic plan view of the structure of the leakage water collector and the disease hydraulic device according to an embodiment of the present invention.

[0049] In the figure: 1-water collecting tank, 1-1 pipeline water delivery pipe interface, 1-2 rainwater delivery pipe interface, 1-3 isobaric tank water recovery pipe interface, 1-4 pipeline water recovery pipe interface, 1-5 pipeline water delivery control module, 1-6 pipeline water delivery start switch, 1-7 pipeline water delivery flow control valve, 1-8 rainwater delivery pipe control module, 1-9 rainwater delivery pipe start switch, 1-10 rainwater delivery pipe flow control valve, 2-rainwater delivery pipeline, 3-pipeline water delivery pipeline, 4-isobaric tank water recovery pipeline, 5-pipeline water recovery pipeline, 6-model box, 6-1 model rainfall bracket, 6-2 model cyclic load bracket, 6-3 model camera monitoring bracket, 6-4 baffle, 6-5 bracket, 7-cyclic load device, 7-1 cyclic load roller device, 7-2 load control box, 7-3 - cyclic load controller, 8- high-definition camera monitoring device, 8-1 camera start controller, 8-2 camera device, 9- isobaric water tank, 9-1 isobaric water tank bracket, 9-2 isobaric water injection plate, 9-3 water injection box, 9-4 isobaric water transmission pipeline, 10- rainfall device, 10-1 rainfall controller, 10-2 rainfall plate, 11- pipeline fixer, 12- buried pipeline, 13- quality monitoring device, 14- seepage water bundler, 14-1 water and soil bundle funnel, 14-2 seepage water bundle pipeline, 15- disease hydraulic device, 16- disease hydraulic controller, 17- seepage water bundle box, 17-1- seepage water collection box, 17-2- bundle control switch, 18- quality monitoring controller, 19- bottom steel plate of model box, 19-2- micropores and 19-2- steel plate structure. DETAILED DESCRIPTION

[0050] In order to better understand the technical solution of the present invention, the content of the present invention includes but is not limited to the specific implementation methods described below, and similar technologies and methods should be considered to be within the scope of protection of the present invention. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0051] It should be clear that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0053] like Figure 1The figure shows the overall framework of the present invention. The present invention is a road collapse test system. The system of the present invention is not limited to the specific operating hardware and programming language, and can be written in any language. Therefore, other working modes are not described in detail.

[0054] like Figure 1 and Figure 2 As shown, the road collapse test system of the present invention includes a water collecting tank 1, a rainwater delivery pipeline 2, a pipe water delivery pipeline 3, an isobaric box water recovery pipeline 4, a pipe water recovery pipeline 5, a model box 6, a cyclic load device 7, an image monitoring device 8, an isobaric water tank 9, a rainfall device 10, a pipeline fixer 11, a pipeline 12, a quality monitoring device 13, a leakage water bundler 14, a disease hydraulic device 15, a disease hydraulic controller 16, a leakage water bundle box 17, a quality monitoring controller 18 and a model box bottom steel plate 19, wherein the image monitoring device is implemented by a high-definition camera monitoring device 8.

[0055] The water collecting tank 1 is connected with the rainwater delivery pipeline 2, the pipeline water delivery pipeline 3, the isobaric tank water recovery pipeline 4, and the pipeline water recovery pipeline 5 through sealed internal threads, and is used to provide rainwater and pipeline water during the test, and to collect external drainage of the pipeline and the isobaric water tank;

[0056] The rainwater delivery pipeline 2 is a plastic pipeline, which is connected to the water collection tank 1 and the rainfall device 10 through threads to provide a water source for the test rainfall;

[0057] The piped water delivery pipeline 3 is a plastic pipeline, which is connected to the water collecting tank 1 and the isobaric water tank 9 by threads, and is used to provide water source for the isobaric water tank 9;

[0058] The isobaric water tank recovery pipeline 4 is a plastic pipeline, which is connected to the water collecting tank 1 and the isobaric water tank 9 by threads, providing a passage for collecting the water discharged from the isobaric water tank 9;

[0059] The pipeline water recovery pipeline 5 is a plastic pipeline, which is connected to the water collecting box 1 and the buried pipeline 12 through threads to collect and process the water discharged from the buried pipeline 12;

[0060] Preferably, if Figure 4 As shown, the model box 6 is made of steel plates and transparent acrylic plates to achieve the paving of road strata and road surfaces.

[0061] The cyclic load device 7 is located above the model box 6 to provide a cyclic load of a road vehicle for the test;

[0062] The high-definition video monitoring device 8 is located directly above the model box 6 to record the deformation of the road surface during the entire experiment;

[0063] The isobaric water tank 9 is located above and behind the model box 6 and is connected to the buried pipeline 12 through threads to provide water for the buried pipeline 12;

[0064] The rain device 10 is connected to the rainwater delivery pipeline 2 to provide rainfall simulation during the test;

[0065] The pipeline fixer 11 is located in front of the model box 6, is made of transparent rubber material, and is connected to the baffle plate by a sealed slot to achieve the fixation of different buried pipelines.

[0066] The buried pipeline 12 is located inside the model box 6, and uses an internal thread structure to connect the pipeline water recovery pipeline 5 and the isobaric water tank position 9 to achieve the layout of the formation pipeline.

[0067] The quality monitoring device 13 is placed in an embedded form at the bottom of the model box 6, and is connected to the quality monitoring controller 18 through a line to record the mass change of the entire model during the test of the model box 6. After water and soil erosion, part of the water seeps into the model box 6, and part of the water and soil flow out of the model box 6. By monitoring the mass change of the entire model box 6, the density drop change law of water and soil action during the test is determined, reflecting the influence characteristics of the model road under water and soil erosion.

[0068] The leakage water collector 14 is placed at the bottom of the bracket 6-1 to collect the leakage water and sediment in the model box 6;

[0069] The disease hydraulic device 15 is threadedly fixed to the bottom of the bracket of the model box 6, and is connected to the disease hydraulic controller 16 through a hydraulic pipe, and is used for arranging different disease types inside the model box 6;

[0070] The disease hydraulic controller 16 is connected to the disease hydraulic device 15 through pipeline threads to achieve power control of the disease hydraulic device 15;

[0071] The leakage water collection box 17 is connected to the leakage water collection device 14 through pipeline threads to collect the leakage water and sediment in the model box 6.

[0072] The quality monitoring controller 18 is connected to the quality monitoring device 13 by a line to record the quality changes of the model box 6 during the test.

[0073] The bottom steel plate 19 of the model box includes micropores 19-2 and a steel plate structure 19-2, which are connected to the bracket 6-5 by welding, so that water and soil in the model box 6 flow out through the micropores 19-1, providing a path for water and soil loss.

[0074] Preferably, if Figure 3As shown, the water collecting tank 1 includes a pipe water delivery pipe interface 1-1, a rainwater delivery pipe interface 1-2, an isobaric tank water recovery pipe interface 1-3, a pipe water recovery pipe interface 1-4, a pipe water delivery control module 1-5, a pipe water delivery start switch 1-6, a pipe water delivery flow control valve 1-7, a rainwater delivery pipe control module 1-8, a rainwater delivery pipe start switch 1-9, and a rainwater delivery pipe flow control valve 1-10. The pipe water delivery pipe interface 1-1 is connected to the pipe water delivery pipeline 3 by an internal thread, and the model pipeline water delivery is realized through the pipe water delivery start switch 1-6 in the pipe water delivery control module 1-5, and the water delivery volume is controlled by the pipe water delivery flow control valve 1-7; the rainwater delivery pipe interface 1-2 is connected to the rainwater delivery pipeline 2 by an internal thread, and the model rainwater delivery is realized through the rainwater delivery pipe start switch 1-9 in the rainwater delivery pipe control module 1-8, and the water delivery volume is controlled by the rainwater delivery pipe flow control valve 1-10.

[0075] Preferably, if Figure 4 , Figure 5 and Figure 6 As shown, the model box 6 includes a rainfall bracket 6-1, a cyclic load bracket 6-2, a camera monitoring bracket 6-3, a baffle 6-4, and a bracket 6-5. The rainfall bracket 6-1 is fixedly connected to the rainfall plate 10-2 by threads, and the rainfall controller 10-1 is used to start the rainfall and control the rainfall amount; the cyclic load bracket 6-2 is connected to the cyclic load roller device 7-1 by roller bearings, and the load control box 7-2 is adjusted by the cyclic load controller 7-3 to achieve the application of the test cyclic load; the camera monitoring bracket 6-3 is fixed to the camera device 8-2 by threads, and the road deformation record of the whole experiment process is achieved by the camera start controller 8-1; the front baffle of the baffle 6-4 is made of transparent acrylic plastic plate, and the left, right and rear baffles are made of 10mm thick steel plate, which are screwed. The pattern is fixed to a bracket 6-5, wherein the front and rear baffles are embedded with pipeline fixers 11 of transparent rubber material to realize the fixation and installation of buried pipelines, and to facilitate the stratum laying and pipeline installation, the rear baffle is divided into three parts: upper, middle and lower baffles, wherein the height of each of the upper, middle and lower baffles is 1m, and the function is as follows: baffles with a height of 1m are assembled in batches, which is convenient for simulating the material laying during the stratum laying process and avoiding the obstruction of material laying due to the height of the baffles; the bottom of the model box 6 is a steel plate with 2mm micropores 19-1, which is connected to the bracket 6-5 by welding, and the bracket 6-5 is a rigid material used to fix the baffle 6-4 and lay the model stratum.

[0076] Preferably, if Figure 7As shown, the isobaric water tank 9 includes an isobaric water tank support 9-1, an isobaric water injection plate 9-2, a water injection tank body 9-3, and an isobaric water delivery pipeline 9-4. The isobaric water tank support 9-1 is connected to the water injection tank body 9-3 by welding, and the main water tank 9-3 is connected to the isobaric water delivery pipeline 9-4 by internal threads to realize water flow delivery of the buried pipeline 12; the isobaric water injection plate 9-2 is connected to the pipeline water delivery pipeline 3 by internal threads.

[0077] Preferably, if Figure 8 As shown, the seepage water bundler 14 is made of 10 mm thick steel, including a water and soil bundle funnel 14-1 and a seepage water bundle pipeline 14-2. The water and soil bundle funnel 14-1 is connected to a seepage water bundle box 17 through a seepage water bundle pipeline 14-2, and the seepage water bundle box 17 includes a seepage water collection box 17-1 and a bundle control switch 17-2.

[0078] Preferably, if Figure 8 As shown, the diseased hydraulic device 15 includes a hydraulic jack 15-1 and a hydraulic pipeline 15-2. The hydraulic jack 15-1 is connected to the diseased hydraulic controller 16 via the hydraulic pipeline 15-2. The diseased hydraulic controller 16 includes a hydraulic emergency brake 16-1, a hydraulic control switch 16-2, a diseased hydraulic control box 16-3, and a hydraulic input controller 16-4. The hydraulic emergency brake 16-1, the hydraulic control switch 16-2 and the hydraulic input controller 16-4 are embedded in the diseased hydraulic control box 16-3. The diseased hydraulic control box 16-3 has the function of protecting the outer shell. The hydraulic emergency brake 16-1 realizes the controller emergency braking when the diseased hydraulic controller 16 operates abnormally (such as hydraulic leakage, etc.); the diseased hydraulic controller 16 is started by the hydraulic control switch 16-2, and the control of a single hydraulic jack 15-1 is realized by the hydraulic input controller 16-4.

[0079] Preferably, if Figure 8 As shown, the quality monitoring controller 18 includes a quality monitoring housing 18-1, a quality data display screen 18-2, a quality monitoring control switch 18-3 and a quality data storage module 18-4. The quality data display screen 18-2, the quality monitoring control switch 18-3 and the quality data storage module 18-4 are embedded in the quality monitoring housing 18-1, and the quality monitoring housing 18-1 has the function of protecting the housing. The quality monitoring controller 18 is started by the quality monitoring control switch 18-3, and the quality data display screen 18-2 displays the model monitoring quality data in real time and stores the data in the quality data storage module 18-4.

[0080] Preferably, the present invention also provides a test method of a road test system, comprising the following steps:

[0081] (1) Assemble the model box 6, install the front baffle, left baffle and right baffle in sequence by threaded connection, and fix the baffle on the bracket 6-5;

[0082] (2) Install the lower baffle of the rear baffle by threaded connection and lay the ground. After the lower ground is laid, install the middle baffle and lay the ground again. Install all pipelines 12 through the pipeline fixture 11. After the middle ground is laid, install the upper baffle and further lay the upper ground;

[0083] (3) After the model is laid, let it stand for 24 hours until the model stratum is stable, and then adjust the descending position of the disease hydraulic device 15 by starting the disease hydraulic controller 16 to set the underground disease type of the model road. If the model disease hydraulic device 15 descends 2 cm, it is a mild loose disease; if the disease hydraulic device 15 descends 5 cm, it is a moderate loose disease; if the disease hydraulic device 15 descends 8 cm, it is a severe loose disease; if the disease hydraulic device 15 descends 15 cm, it is a soil hollow disease; if the disease hydraulic device 15 descends 20 cm, it is a cavity disease;

[0084] (4) Start the high-definition video monitoring device 8 and the quality monitoring controller 18 to timely record the deformation of the model test road surface and the quality change of the model box;

[0085] (5) Turn on the rainwater delivery pipe start switch 1-9 and the rainwater delivery pipe flow control valve 1-10, transport the water in the water collection tank 1 to the rainfall device 10 through the rainwater delivery pipeline 2, and control the rainfall amount through the rainfall controller 10-1 to achieve rainfall simulation;

[0086] (6) Turn on the pipeline water delivery start switch 1-6 and the pipeline water delivery flow control valve 1-7, transport the water in the water collection tank 1 to the isobaric water tank 9 through the pipeline water delivery pipeline 3, and evenly inject the water into the water injection tank 9-3 with the help of the isobaric water injection plate 9-2, and then connect the buried pipeline 12 through the isobaric water delivery pipeline 9-4. Finally, connect the water collection tank 1 with the help of the pipeline water recovery pipeline 5, recycle the pipeline water, and realize pipeline water simulation;

[0087] (7) Open the cyclic load controller 7-3 and adjust the road surface cyclic vehicle load and rate by adjusting the load control box 7-2 to reach the predetermined load and predetermined rate, and use the cyclic load roller device 7-1 to realize the effect of the cyclic load on the road stratum;

[0088] (8) Turn on the cluster control switch 17-2, collect the water and soil in the model box 6 through the micropores 19-1 at the bottom of the model box through the water and soil action, and collect them in the water and soil cluster funnel 14-1, and then collect them into the seepage water collection box 17-1 through the seepage water cluster pipeline 14-2, so as to collect the pipeline seepage water and sediment;

[0089] (9) During the experiment, the mass change of the model box is recorded and stored until the model box collapses and the test is terminated.

[0090] (10) Repeat the above steps (1)-(5), (8)-(9) to implement the collapse model test under the action of rainfall for each disease body;

[0091] (11) Repeat the above steps (1)-(4), (6), (8)-(9) to implement the collapse model test of underground pipeline leakage under each disease body condition;

[0092] (12) Repeat the above steps (1)-(4), (7)-(9) to implement the collapse model test under cyclic load for each diseased body;

[0093] (13) Repeat the above steps (1)-(6), (8)-(9) to implement the collapse model test of the combined effect of rainfall and underground pipeline leakage in each disease body;

[0094] (14) Repeat the above steps (1)-(5), (7)-(9) to implement the collapse model test under the combined effect of rainfall and cyclic load for each disease body;

[0095] (15) Repeat the above steps (1)-(4), (6)-(9) to implement the collapse model test of the combined effects of underground pipeline leakage and cyclic load in each disease body condition.

[0096] Each of the above-mentioned diseased bodies includes but is not limited to the five types of diseased bodies (mildly loose, heavily loose, severely loose, hollow, and void) of the present invention. Through the above method, the test device of the present invention simulates the density drop and road surface deformation characteristics of the five types of diseased bodies (mildly loose, heavily loose, severely loose, hollow, and void) under the action of leaking pipelines, rainfall and cyclic loads.

[0097] Preferably, in the embodiment of the present invention, the water-soil density drop of the leaking pipeline reflects the phenomenon that the model road structure is eroded by water and soil, causing part of the soil to be washed away by water, resulting in the change of the model water-soil density per unit time. The law of this phenomenon can reflect the density state characteristics of the model soil structure under water erosion. Therefore, the present invention proposes a calculation method for it as follows:

[0098] (1) The mass monitoring controller 18 records the overall mass of the model box as G. There are other components in the model box, but the only change during the entire test is the mass of the seepage water and lost soil. Therefore, the overall model box can achieve the density change of water and soil action per unit time, reflecting the water and soil erosion and collapse effect of the model road structure. With the action of the leakage pipeline, the mass G caused by soil erosion at time t1 changes to G1, and t2, t3, t4…t are recorded in sequence. n The mass of the model box at this moment is G2, G3, G4…G n In addition, the total volume V of the model box remains unchanged, so the initial density can be expressed as: ρ = G / V, and the current density is: ρ n =G n / V, then Δρ=ρ-ρ n =(GG n ) / V.

[0099] (2) The soil density drop of the leaking pipeline is defined as the change in density per unit time. The soil density drop D satisfies:

[0100]

[0101] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not depart from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A test method for a road collapse test system, characterized in that: The road collapse test system is used to implement the test, which includes a water collection tank, a model box, a cyclic load device, an image monitoring device, an isobaric water tank, a rainfall device, several pipelines, a quality monitoring device and a disease hydraulic device. The water collecting tank is connected to the isobaric water tank, pipeline and rainfall device to provide rainwater and drainage of the pipeline during the test; A plurality of pipelines are buried inside the model box, and the model box is used for laying road strata, stratum pipelines and road surfaces; The cyclic load device is located above the model box and is used to provide a cyclic load of a road vehicle; The image monitoring device is located directly above the model box and is used to record the deformation of the road surface during the entire test process; The isobaric water tank is located at the upper rear of the model box and is used to provide pipeline water for the pipeline; The rainfall device is used to provide rainfall simulation for the model box; The quality monitoring device is used to record the quality changes of the model box during the test; The disease hydraulic device is used to arrange different disease types inside the model box; The steps of the method are as follows: S1. Assemble the model box, lay the ground in it and install all pipelines in the ground; S2. After the laying is completed in the model box, let it stand for a while until the model stratum is stable, start the disease hydraulic controller to adjust the descending position of the disease hydraulic device, and set the underground disease type of the model road; S3. Start the high-definition video monitoring device and the quality monitoring controller to record the deformation of the test road surface in the model box and the quality change of the model box; S4. Open the rainwater delivery pipe start switch and the rainwater delivery pipe flow control valve to transport the water in the water collection tank to the rainfall device to achieve rainfall simulation; S5. Turn on the pipeline water delivery start switch and pipeline water delivery flow control valve, transport the water in the water collection tank to the isobaric water tank, evenly inject the water into the water injection tank, inject the water into each pipeline through the isobaric water delivery pipeline, and finally return the water to the water collection tank through the pipeline water recovery pipeline to realize pipeline water simulation; S6. Start the cyclic load device to adjust the road surface cyclic vehicle load and speed to reach the predetermined load and predetermined speed, so as to realize the effect of the cyclic load on the road stratum; S7. Turn on the cluster control switch to collect the water and soil leaking from the model box into the leakage water cluster device, and then into the leakage water collection box to collect the pipeline leakage water and sediment; S8. Record and store the mass change of the model box during the test until the road surface collapses in the model box and the test is terminated; Among them, the calculation method of water-soil density drop of leaking pipeline is as follows: (1) Record the mass G of the model box before the test. With the effect of the leaking pipeline, the mass G changes to G1 due to soil erosion at time t1. Record t2, t3, t4…t n The mass of the model water tank at this moment is G2, G3, G4…G n , in addition, the total volume V of the model water tank remains unchanged, so the initial density can be expressed as: , the current density is: , then it satisfies ; (2) Define the soil density drop of the leaking pipeline as the change in density per unit time, then the soil density drop D satisfies: 。 2. The test method according to claim 1, characterized in that It also includes a rainwater delivery pipeline, a pipe water delivery pipeline, an isobaric tank water recovery pipeline and a pipe water recovery pipeline, wherein one end of the rainwater delivery pipeline is connected to the water collecting tank, and the other end is connected to the rainfall device; one end of the pipe water delivery pipeline and the isobaric water tank recovery pipeline are both connected to the water collecting tank, and the other end is both connected to the isobaric water tank; one end of the pipe water recovery pipeline is connected to the water collecting tank, and the other end is connected to all the pipelines.

3. The test method according to claim 2, characterized in that It also includes a seepage water collector and a seepage water collector box arranged at the bottom of the model box body, which are used to collect the seepage water and sediment in the model box body.

4. The test method according to claim 2, characterized in that: The water collecting tank includes a pipe water delivery pipe interface, a rainwater delivery pipe interface, an isobaric water tank recovery pipe interface, a pipe water recovery pipe interface, a pipe water delivery control module, a pipe water delivery start switch, a pipe water delivery flow control valve, a rainwater delivery pipe control module, a rainwater delivery pipe start switch and a rainwater delivery pipe flow control valve, wherein the pipe water delivery pipe interface is connected to the pipe water delivery pipeline, and the pipe water delivery start switch is controlled by the pipe water delivery control module to realize pipeline water delivery, and the pipe water delivery flow control valve controls the amount of pipeline water delivered; the rainwater delivery pipe interface is connected to the rainwater delivery pipeline, and the rainwater delivery pipe start switch is controlled by the rainwater delivery pipe control module to deliver rainwater to the model box, and the rainwater delivery pipe flow control valve controls the amount of rainwater delivered.

5. The test method according to claim 1, characterized in that: The model box includes a plurality of baffles and brackets, wherein the front baffle is made of a transparent acrylic plastic plate, and the left, right and rear baffles are all made of steel plates, which are all fixed to the brackets by threads. Pipeline fixers are arranged in the front and rear baffles for fixing and installing the pipelines; the rear baffle includes upper, middle and lower baffles.

6. The test method according to claim 2, characterized in that: The isobaric water tank comprises a bracket, an isobaric water injection plate, a water injection box body and an isobaric water delivery pipeline, wherein the bracket is connected to the water injection box body, the water injection box body and the isobaric water delivery pipeline are connected via internal threads; the isobaric water injection plate and the pipeline water delivery pipeline are connected via internal threads.

7. The test method according to claim 3, characterized in that: The seepage water bundler is made of steel material and includes a water-soil bundle funnel and a seepage water bundle pipeline; the water-soil bundle funnel is connected to a seepage water bundle box through the seepage water bundle pipeline; the seepage water bundle box includes a seepage water collection box and a bundle control switch.

8. The test method according to claim 1, characterized in that: It also includes a disease hydraulic controller, the disease hydraulic device includes a hydraulic jack and a hydraulic pipeline, and the hydraulic jack is connected to the disease hydraulic controller through the hydraulic pipeline.

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