Pipeline dynamic response simulation device and method based on vehicle load coupling foundation differential settlement effect

Abstract

The invention discloses a pipeline dynamic response simulation device under the action of vehicle load coupling foundation differential settlement, which is characterized by comprising a model tank, a load simulation assembly, a settlement simulation assembly, a data monitoring assembly, a soft soil sample and a pipeline model, the load simulation assembly comprises an electro-hydraulic servo high-cycle electric cylinder and a vehicle model, a soft soil sample is laid in the model groove, the pipeline model is embedded in the soft soil sample, the data monitoring assembly is distributed in the pipeline model and in the surrounding soil sample, the electro-hydraulic servo high-circulation electric cylinder is connected with the vehicle model and controls the vehicle model to reciprocate, and the settlement simulation assembly comprises a settlement box and a jack. The settlement box is arranged in the model groove and located below the soft soil sample, and the jack is arranged below the settlement box and controls the settlement box to ascend and descend. According to the device, cyclic load and differential settlement can be simulated through the load simulation assembly and the settlement simulation assembly, and more diversified and accurate test data can be obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering and relates to a simulation device for a vehicle load acting on a buried pipeline. Background Art

[0002] As an important part of the city's lifeline, the safe and stable operation of underground pipeline systems is crucial to social and economic development and the quality of life of the people. However, under the action of additional loads, the soil in the soft soil foundation is very likely to produce uneven settlement, threatening the safe operation of the pipeline; when the buried pipeline passes through the traffic network, the soil settlement and deformation will be further aggravated under the action of traffic loads, causing the pipeline to deform and be damaged.

[0003] Uneven foundation settlement is one of the major threats facing underground pipeline systems. It not only directly causes pipeline damage, but may also cause leakage, further erode the surrounding soil, form a vicious cycle, aggravate the secondary damage of the pipeline system, and bury major hidden dangers for the safety of the pipeline system. At present, the research on the stress and deformation of buried pipelines induced by vehicle load coupled with uneven foundation settlement mainly focuses on the influence of single factors such as vehicle load or uneven soil settlement. Most studies do not consider the coupling effect between the two. The research method mainly uses advanced numerical simulation software to perform simulation analysis to reveal complex mechanical behavior. Numerical simulation technology shows higher potential in predicting pipeline deformation, and its calculation results are closer to engineering practice, but the lack of accuracy is highly dependent on the precise selection of model parameters. There is currently a lack of unified standards and clear guidance.

[0004] Therefore, it is necessary to study a simulation device that can deeply explore the mechanical response characteristics of buried pipelines under the action of vehicle load coupled with uneven foundation settlement, so as to obtain more diverse data for application in numerical simulation technology research. Summary of the invention

[0005] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide a pipeline dynamic response simulation device and method based on the vehicle load coupled with the uneven foundation settlement, which can be used to simulate the vehicle load to load the buried pipeline in the soft soil sample at different speeds and different loads, and can also simultaneously simulate the uneven settlement of different depths and different times, so as to obtain more diverse data and improve the reference value of the test.

[0006] To this end, the present invention is implemented by adopting the following technical solutions:

[0007] A pipeline dynamic response simulation device based on vehicle load coupling with uneven foundation settlement, comprising a model trough, a load simulation component, a settlement simulation component, a data monitoring component, a soft soil sample and a pipeline model, wherein the load simulation component comprises an electro-hydraulic servo high-cycle electric cylinder and a vehicle model, a soft soil sample is laid in the model trough, a pipeline model is buried in the soft soil sample, the data monitoring component is distributed in the pipeline model and in the surrounding soil samples, a vehicle model is placed on the surface of the soft soil sample, the electro-hydraulic servo high-cycle electric cylinder is connected to the vehicle model and controls the reciprocating movement of the vehicle model, the settlement simulation component comprises a settlement box and a jack, the settlement box is arranged in the model trough and below the soft soil sample, and the jack is arranged below the settlement box and controls the lifting and lowering of the settlement box.

[0008] Furthermore, a settlement box is provided at the bottom end of the model trough, a jack is provided below the model trough, a plurality of openings are provided at the bottom of the model trough, the jack is supported against the settlement box through the bottom openings, and the lifting and lowering of the settlement box is controlled by adjusting the height of the jack to achieve uneven settlement of the soft soil sample.

[0009] Furthermore, an opening is provided on one side of the model slot near the electro-hydraulic servo high-cycle electric cylinder, and the electro-hydraulic servo high-cycle electric cylinder is provided with a hydraulic actuator. The hydraulic actuator passes through the opening of the model slot and is connected to the vehicle model. The electro-hydraulic servo high-cycle electric cylinder can control the vehicle model to reciprocate at a set frequency and speed through the hydraulic actuator, thereby reciprocatingly loading the surface of the soft soil sample.

[0010] Furthermore, the model groove includes an angle steel bracket and a plurality of highly transparent acrylic plates, and the plurality of highly transparent acrylic plates are installed on the upper end of the angle steel bracket to form a model groove for accommodating the test device.

[0011] Furthermore, a plurality of weights are arranged on the vehicle model.

[0012] Furthermore, the data monitoring component includes an earth pressure box and a strain gauge, the earth pressure box is respectively arranged in the soft soil samples at the upper and lower ends and the side of the pipeline model, and the strain gauge is evenly distributed inside the pipeline model.

[0013] Furthermore, the pipeline model is composed of at least one socket concrete pipeline model.

[0014] Furthermore, the data monitoring component is wirelessly connected to an external dynamic and static data collector.

[0015] A test method for a pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement, characterized by the following steps:

[0016] (1) Conduct test preparation

[0017] Splice the horizontal and vertical angle steels with the highly transparent acrylic plate to form a model trough, place a settlement box in the model trough and fill it with soft soil samples, dig up the soft soil samples to bury the pipeline model and data detection components, and then backfill and compact the soil samples;

[0018] (2) Cyclic load simulation

[0019] Assemble the model tank and the vehicle load assembly, start the electro-hydraulic servo high-cycle electric cylinder and hydraulic actuator, use weights to increase the load on the vehicle model, and drive the vehicle model to cyclically load the soft soil sample above the pipeline at a set frequency and speed;

[0020] (3) Sedimentation simulation

[0021] Place the jack under the settlement box and lift the settlement box, and lower the jack according to the set settlement depth and settlement times to achieve uneven settlement;

[0022] (4) Data monitoring

[0023] The data monitoring component is used to monitor the various data of the pipeline model and the surrounding soil samples in real time, which are collected and processed by dynamic and static data acquisition instruments and computing software;

[0024] (5) End of the test

[0025] Conduct data processing and related research.

[0026] After adopting the above technical solution, the beneficial effects are as follows:

[0027] 1. This device can adjust the parameters of the electro-hydraulic servo high-cycle electric cylinder, control the vehicle model to move at different speeds and frequencies through the hydraulic actuator, and simulate the dynamic response characteristics of the pipeline under the action of vehicle load, so as to obtain more diverse test data, making the test data more meaningful for reference in the actual pipeline engineering design;

[0028] 2. This device can drive the settlement box to rise and fall by adjusting the height of the jack, and can achieve uneven settlement of different depths and times. Through simple operation, the simulation of pipeline dynamic response problems under the action of vehicle load coupled with uneven settlement can be realized, making the test results more in line with actual working conditions and more instructive;

[0029] 3. This device can comprehensively realize the monitoring and analysis of pipelines under the action of vehicle load coupled with uneven foundation settlement, including: soil pressure, pipeline stress-strain and other monitoring functions;

[0030] 4. The device has a simple structure and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention has the following accompanying drawings:

[0032] Figure 1 It is a schematic diagram of the structure of a test device for simulating pipeline dynamic response under the action of vehicle load coupled with uneven foundation settlement;

[0033] Figure 2 This is a front view of a test device for simulating pipeline dynamic response under vehicle load coupled with uneven foundation settlement;

[0034] Figure 3 It is the left view of a test device for simulating pipeline dynamic response under vehicle load coupled with uneven foundation settlement;

[0035] Figure 4 A top view of a test device for simulating pipeline dynamic response under vehicle load coupled with uneven foundation settlement;

[0036] Figure 5 It is a right view of the main view of a test device for simulating pipeline dynamic response under the action of vehicle load coupled with uneven foundation settlement;

[0037] Figure 6 It is a flow chart of a test method for a pipeline dynamic response simulation device test device based on vehicle load coupled with uneven foundation settlement;

[0038] Figure numerals: 1 vehicle model; 2 control console; 3 electro-hydraulic servo high-cycle electric cylinder; 4 soil pressure box; 5 settlement box; 6 pipeline model; 7 high-transparent acrylic plate; 8 jack; 9 angle steel bracket; 10 hydraulic actuator; 11 weight; 12, soft soil sample. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0040] Reference Figure 1-5As shown, a pipeline dynamic response simulation device based on vehicle load coupling with uneven foundation settlement is characterized in that it includes a model tank, a load simulation component, a data monitoring component, a soft soil sample 6 and a pipeline model 7, the load simulation component includes an electro-hydraulic servo high-cycle electric cylinder 3 and a vehicle model 1, a soft soil sample 12 is laid in the model tank, a pipeline model 6 is buried in the soft soil sample 12, and a vehicle model 1 is placed on the surface of the soft soil sample 12, the electro-hydraulic servo high-cycle electric cylinder 3 is connected to the vehicle model 1, and a plurality of weights 11 are arranged on the vehicle model 1, the data monitoring component is distributed in the pipeline model 6 and the surrounding soil samples, and the electro-hydraulic servo high-cycle electric cylinder is also provided with a control console 2, and the control console 2 can be used to adjust the frequency of the electro-hydraulic servo high-cycle electric cylinder 3 and control the weight or quantity of the vehicle model weights 11 to control the vehicle model 1 to simulate the dynamic response process of the vehicle load to the buried pipeline at different speeds and different load conditions, so as to collect the dynamic response characteristics of the buried pipeline in the process.

[0041] The settlement simulation component includes a settlement box 5 and a jack 8. The settlement box 5 is arranged below the soft soil sample in the model trough, and the jack 8 is arranged below the model trough. A plurality of openings are arranged at the bottom of the model trough. The jack 8 is supported against the settlement box 5 through the bottom openings. The height of the jack 8 is adjusted to control the lifting and lowering of the settlement box 5, so as to realize the uneven settlement of the soft soil sample 12.

[0042] The model groove includes an angle steel bracket 9 and a plurality of highly transparent acrylic plates 7, wherein the plurality of highly transparent acrylic plates 7 are installed at the upper end of the angle steel bracket 9 to form a model groove for accommodating the test device. The highly transparent acrylic plates 7 are used to assemble the model groove, so that the settlement state inside the model groove can be observed conveniently. The model groove is assembled at the upper end of the angle steel bracket 9 so that there is enough space below the model groove to place the jack 8 according to the settlement depth of the test.

[0043] An opening is provided on one side of the model slot near the electro-hydraulic servo high-cycle electric cylinder 3, and the electro-hydraulic servo high-cycle electric cylinder 3 is provided with a hydraulic actuator 10, and the hydraulic actuator 10 passes through the model slot opening and is connected to the vehicle model 1. The electro-hydraulic servo high-cycle electric cylinder 3 can control the vehicle model 1 through the hydraulic actuator 10 to reciprocately load the surface of the soft soil sample 12 at a set frequency and speed. The length of the hydraulic actuator 10 can meet the parameter setting requirements of the distance between the soil sample and the pipeline. Its power transmission is stable and the control is convenient, so that the frequency adjusted by the electro-hydraulic servo high-cycle electric cylinder 3 can be accurately transmitted to the vehicle model, ensuring the rigor of the experiment.

[0044] The data monitoring component includes an earth pressure box 4 and a strain gauge. The earth pressure box 4 is respectively arranged in the soft soil samples at the upper and lower ends and the side of the pipeline model 6. The strain gauge is evenly distributed inside the pipeline model 6. The data monitoring component is wirelessly connected to an external dynamic and static collector. The dynamic response characteristics of the buried pipeline under cyclic load can be more comprehensively monitored and analyzed through the various data monitoring components.

[0045] The pipeline model 6 is composed of at least one socket concrete pipeline model. The length of the pipeline model can be adjusted by splicing multiple socket concrete pipeline models according to test requirements to obtain more diverse test data.

[0046] like Figure 6 As shown, according to the above-mentioned pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement, the present invention also provides a test method for the pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement, and the steps are as follows:

[0047] S1, prepare for the experiment

[0048] First, use bolts to connect the horizontal and vertical angle steels 9 into a frame, and splice the highly transparent acrylic plate 7 with the frame; after placing the settlement box 5 at the bottom of the model tank, prepare the soft soil sample 12 as needed, place it in the model tank, and fill it to the required height; then excavate to the required depth in the filled soft soil sample 12, bury the pipeline model 6 and the data monitoring component, and then backfill and compact the soil sample;

[0049] S2, cyclic loading simulation

[0050] Start the electro-hydraulic servo high cycle tester 3 and adjust the frequency required for the test. The hydraulic actuator 10 will drive the vehicle model 1 at the set frequency and speed. The pressure caused by the vehicle model 1 is controlled by the weight 11. The soil at the specified position above the pipeline is reciprocated and the number of cycles is controlled by the console 2 so that the vehicle load acts on the pipeline model 6.

[0051] S3, sedimentation simulation

[0052] Connect the jack 8 to the power supply and place it directly under the settlement box 5. First, use the remote control to lift the jack 8 to the height of the bottom plate of the settlement box 5, and then lower the jack 8 according to the set settlement depth and settlement times. The settlement box 5 follows the jack 8 to settle to achieve uneven settlement. The side plate of the settlement box 5 can prevent the soil sample from scattering and affecting the actual settlement distance.

[0053] S4, data monitoring

[0054] The soil pressure box 4 is respectively set in the soft soil sample 12 at the upper and lower ends and the side of the pipeline model 6 to monitor and collect soil pressure data around the pipeline model 6. The strain gauges are evenly distributed inside the pipeline model 6. The strain gauges collect the axial and annular stress and strain of the pipeline when the pipeline model 6 is subjected to cyclic loads under the action of internal pressure. The data monitoring component is wirelessly connected to the external dynamic and static acquisition instrument. The dynamic and static acquisition instrument and the calculation software are used to determine the soil pressure changes around the pipeline and the stress and strain characteristics of the pipeline under the action of uneven settlement.

[0055] S5, end of test

[0056] The electro-hydraulic servo high cycle test cylinder 3 is unloaded and shut down after unloading; after the uneven settlement ends, the power supply of the jack 8 is turned off; the data monitoring device is turned off, the test is ended, and data processing and related research are carried out.

[0057] After adopting the above technical scheme, the simulation device can simulate the dynamic response problem of the pipeline under the action of vehicle load coupled with uneven settlement. More diverse test data can be obtained by adjusting parameters and model states. The test data has smaller errors and is more in line with actual working conditions. It has a greater reference role in the actual pipeline engineering and protection measures design.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement, characterized by: It includes a model trough, a load simulation component, a settlement simulation component, a data monitoring component, a soft soil sample and a pipeline model. The load simulation component includes an electro-hydraulic servo high-cycle electric cylinder and a vehicle model. The soft soil sample is laid in the model trough, and the pipeline model is buried in the soft soil sample. The data monitoring component is distributed in the pipeline model and in the surrounding soil samples. The vehicle model is placed on the surface of the soft soil sample. The electro-hydraulic servo high-cycle electric cylinder is connected to the vehicle model and controls the reciprocating movement of the vehicle model. The settlement simulation component includes a settlement box and a jack. The settlement box is arranged in the model trough and below the soft soil sample. The jack is arranged below the settlement box and controls the lifting and lowering of the settlement box.

2. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 1 is characterized by: A settlement box is arranged at the bottom end of the model trough, a jack is arranged below the model trough, a plurality of openings are arranged at the bottom of the model trough, the jack is pressed against the settlement box through the bottom openings, and the lifting and lowering of the settlement box is controlled by adjusting the height of the jack to achieve uneven settlement of the soft soil sample.

3. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 2 is characterized by: An opening is provided on one side of the model slot close to the electro-hydraulic servo high-cycle electric cylinder. The electro-hydraulic servo high-cycle electric cylinder is provided with a hydraulic actuator. The hydraulic actuator passes through the opening of the model slot and is connected to the vehicle model. The electro-hydraulic servo high-cycle electric cylinder can control the vehicle model to reciprocate at a set frequency and speed through the hydraulic actuator, thereby reciprocatingly loading the surface of the soft soil sample.

4. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 2 or 3 is characterized in that: The model groove comprises an angle steel bracket and a plurality of highly transparent acrylic plates, and the plurality of highly transparent acrylic plates are mounted on the upper end of the angle steel bracket to form a model groove for accommodating the test device.

5. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 2 or 3 is characterized in that: A plurality of weights are arranged on the vehicle model.

6. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 5 is characterized by: The data monitoring component includes an earth pressure box and a strain gauge. The earth pressure box is respectively arranged in soft soil samples at the upper and lower ends and the side of the pipeline model, and the strain gauge is evenly distributed inside the pipeline model.

7. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 6 is characterized by: The pipeline model consists of at least one socket concrete pipeline model.

8. The pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to claim 7 is characterized by: The data monitoring component is wirelessly connected to an external dynamic and static data collector.

9. A test method for a pipeline dynamic response simulation device based on vehicle load coupled with uneven foundation settlement according to any one of claims 1 to 8, characterized in that: The steps are as follows, (1) Conduct test preparation Splice the horizontal and vertical angle steels with the highly transparent acrylic plate to form a model trough, place a settlement box in the model trough and fill it with soft soil samples, dig up the soft soil samples to bury the pipeline model and data detection components, and then backfill and compact the soil samples; (2) Cyclic load simulation Assemble the model tank and the vehicle load assembly, start the electro-hydraulic servo high-cycle electric cylinder and hydraulic actuator, use weights to increase the load on the vehicle model, and drive the vehicle model to cyclically load the soft soil sample above the pipeline at a set frequency and speed; (3) Sedimentation simulation Place the jack under the settlement box and lift the settlement box, and lower the jack according to the set settlement depth and settlement times to achieve uneven settlement; (4) Data monitoring The data monitoring component is used to monitor the various data of the pipeline model and the surrounding soil samples in real time, which are collected and processed by dynamic and static data acquisition instruments and computing software; (5) Complete the experiment and conduct data processing and related research.

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