Simulation device for vehicle load acting on buried pipeline

Abstract

The utility model discloses a simulation device for a vehicle load acting on a buried pipeline, which is characterized in that the simulation device comprises a model groove, a load 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, the soft soil sample is laid in the model groove, and the vehicle model is laid in the model groove. The pipeline model is embedded in the soft soil sample, the data monitoring assemblies are distributed in the pipeline model and in the surrounding soil sample, the vehicle model is placed on the surface of the soft soil sample, and the electro-hydraulic servo high-cycle electric cylinder is connected with the vehicle model and controls the vehicle model to reciprocate. According to the simulation device, the parameters of the electro-hydraulic servo high-cycle electric cylinder are adjusted, the hydraulic actuator drives the vehicle model to perform reciprocating loading on the soil surface at different speeds and frequencies, the dynamic response characteristics of the buried pipeline under the vehicle load effect are determined, and more diversified and accurate test data are obtained.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geotechnical engineering technical field relates to the simulation device that vehicle load acts on buried pipeline. BACKGROUND

[0002] When buried pipeline is designed, needs to bear the pressure of soil body, and will also be affected by various vehicle loads on the ground, is easy to produce deformation, and the deformation of buried pipeline is mainly affected by the rigidity of pipe material and the mechanical properties of surrounding soil, and the mechanical properties of soft soil foundation are extremely poor, and the buried pipeline buried therein is easy to produce subsidence, cracking and warping deformation.

[0003] The bad ground soil has the characteristics of high water content, high compressibility, low shear strength, high sensitivity and poor bearing capacity, and is easy to produce disturbance and deformation under external force. And the pressure caused by the ground, cyclic load and pipeline operation will aggravate such adverse effects, leading to serious hazards such as urban waterlogging, resource waste and underground pollution, which has a great impact on people's life, economy and safety. At present, the research on buried pipeline under vehicle load mainly depends on single cyclic load model test, and the model cannot truly represent the influence of vehicle load on buried pipeline in actual operation, so the influence law of vehicle load on pipeline has certain limitations. Therefore, it is necessary to solve the problem that the current cyclic load model test cannot simulate the influence of vehicle on buried pipeline under different vehicle speeds and loads, and cannot comprehensively reflect the performance of buried pipeline under real operating conditions, which is limited to the development of pipeline engineering design and protection measures under vehicle load. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the background art, the technical problem to be solved by the utility model is to provide a simulation device for vehicle load acting on buried pipeline, which is easy to operate and can be used to simulate vehicle load to load buried pipeline in soft soil sample at different speeds and different loads, obtain more data and improve the reference value of the test.

[0005] Therefore, the utility model is implemented by adopting the following technical solutions:

[0006] A simulation device for vehicle load acting on buried pipeline, comprising a model tank, a load 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, the model tank is paved with a soft soil sample, the soft soil sample is internally buried with a pipeline model, the data monitoring assembly is distributed in the pipeline model and the surrounding soil sample, the soft soil sample surface is placed with a vehicle model, and the electro-hydraulic servo high-cycle electric cylinder is connected with the vehicle model and controls the reciprocating movement of the vehicle model.

[0007] Further, the model groove is provided with an opening near one side of 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 is connected with the vehicle model through the opening of the model groove, and the electro-hydraulic servo high-cycle electric cylinder can control the vehicle model to move back and forth at a set frequency and speed through the hydraulic actuator to load the soft soil sample surface back and forth.

[0008] Further, the vehicle model is provided with a plurality of weights.

[0009] Further, the data monitoring assembly comprises strain gauges, soil pressure cells, pore water pressure gauges and displacement meters, the strain gauges are uniformly distributed in the pipeline model, the soil pressure cells are dispersedly arranged in the soft soil sample around the pipeline model, and the pore water pressure gauges and the displacement meters are arranged at the left and right ends and the side of the pipeline model.

[0010] Further, the pipeline model is composed of at least one socket concrete pipeline model.

[0011] Further, the data monitoring assembly is wirelessly connected with an external dynamic and static acquisition instrument.

[0012] After the above technical scheme is adopted, the beneficial effects are as follows:

[0013] 1. The 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, realize the simulation of the dynamic corresponding characteristics of the pipeline under the action of the vehicle load, obtain more diversified test data, and make the test data more meaningful in actual pipeline engineering design.

[0014] 2. The device can comprehensively realize the monitoring and analysis of the pipeline under the action of the cyclic load, including the monitoring functions of the soil pressure, the pipeline stress-strain, the soft soil pore pressure change and the displacement of the pipeline; 3. The device has a simple structure and is easy to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model has the following drawings:

[0016] Figure 1 It is a test device perspective view of a vehicle load acting on a buried pipeline simulation device;

[0017] Figure 2 It is a test device left view of a vehicle load acting on a buried pipeline simulation device;

[0018] Figure 3 It is a test device left view sectional view of a vehicle load acting on a buried pipeline simulation device;

[0019] Figure 4A test device for a simulation device of vehicle load acting on a buried pipeline is shown in a front view;

[0020] Figure 5 A sectional view of a test device for a simulation device of vehicle load acting on a buried pipeline is shown in a front view;

[0021] The figure shows: 1 electric-hydraulic servo high-cycle electric cylinder; 2 hydraulic actuator; 3 vehicle model; 4 control console; 5 model tank; 6 soft soil sample; 7 pipeline model; 8 earth pressure cell; 9 strain gauge; 10 weight; 11 displacement meter; 12 pore water pressure meter. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means adopted by the present application and the effects achieved by the present application, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0023] Referring to Figures 1-5 The figure shows a simulation device of vehicle load acting on a buried pipeline, characterized in that it comprises a model tank 5, a load simulation assembly, a data monitoring assembly, a soft soil sample 6 and a pipeline model 7, the load simulation assembly comprises an electric-hydraulic servo high-cycle electric cylinder 1 and a vehicle model 3, the model tank 5 is paved with the soft soil sample 6, the pipeline model 7 is buried in the soft soil sample 6, the vehicle model 3 is placed on the surface of the soft soil sample 5, the electric-hydraulic servo high-cycle electric cylinder 1 is connected with the vehicle model 3, a plurality of weights are arranged on the vehicle model 3, the data monitoring assembly is distributed in the pipeline model 7 and the surrounding soil sample, the electric-hydraulic servo high-cycle electric cylinder is further provided with a control console 4, the frequency of the electric-hydraulic servo high-cycle electric cylinder 1 and the weight or quantity of the vehicle model weight 10 can be adjusted by the control console 4, the dynamic response process of the buried pipeline under the simulation vehicle load of the vehicle model 7 under different speeds and different load conditions is controlled, and the dynamic response characteristics of the buried pipeline in the process are collected.

[0024] The model tank 5 is provided with an opening on the side close to the electric-hydraulic servo high-cycle electric cylinder 1, the electric-hydraulic servo high-cycle electric cylinder 1 is provided with a hydraulic actuator 2, the hydraulic actuator 2 is connected with the vehicle model 3 through the opening of the model tank 5, the electric-hydraulic servo high-cycle electric cylinder 1 can control the vehicle model 3 to reciprocally load on the surface of the soft soil sample 6 at a set frequency and speed through the hydraulic actuator 2, the length of the hydraulic actuator 2 can meet the parameter setting requirement of the distance between the soil sample and the pipeline, the power transmission is stable and the control is convenient, the frequency adjusted by the electric-hydraulic servo high-cycle electric cylinder 1 can be accurately transmitted to the vehicle model, and the test is rigorous.

[0025] The data monitoring assembly includes strain gauges 9, soil pressure cells 8, pore water pressure gauges 12 and displacement meters 11, the strain gauges 9 are uniformly distributed inside the pipeline model 7, the soil pressure cells 8 are dispersedly arranged in the soft soil sample 6 around the pipeline model 7, the pore water pressure gauges 12 and the displacement meters 11 are buried at the left and right ends and the side of the pipeline model, and the data monitoring assembly is wirelessly connected with an external dynamic and static acquisition instrument. Through the various data monitoring assemblies, the dynamic response characteristics of the buried pipeline under the cyclic load can be more comprehensively monitored and analyzed.

[0026] The pipeline model 7 is composed of at least one bell and spigot concrete pipeline model, and the length of the pipeline model can be adjusted by splicing a plurality of bell and spigot concrete pipeline models according to the test requirements, so as to obtain more test data.

[0027] The test steps of the simulation device of the vehicle load acting on the buried pipeline are as follows:

[0028] (1) In the test preparation stage, the electro-hydraulic servo high-cycle electric cylinder 1 is placed outside the model tank 5, the soft soil sample 6 is taken as needed and placed in the model tank 5 and filled to the required height; the pipe trench is excavated to the required depth in the filled soft soil sample, and then the required pipeline model 7 is buried, and the soil sample is backfilled and compacted.

[0029] (2) When the test starts, the electro-hydraulic servo high-cycle testing machine 1 is started and the required frequency of the test is adjusted, the hydraulic actuator 2 drives the vehicle model 3 at the set frequency and speed, the pressure caused by the vehicle model 3 is controlled by the weight 10, the soil at the specified position above the pipeline is reciprocally loaded, the cycle number is controlled through the console 4, and the vehicle load acts on the pipeline model 7.

[0030] (3) During the test, the vehicle model 3 reciprocally acts on the pipeline model 7 under the driving of the electro-hydraulic servo high-cycle testing cylinder 1, which truly simulates the size, direction and action point characteristics of the traffic load. The soil pressure cells 8 are buried in the soft soil sample 6 around the pipeline model 7, which are used to measure and collect the vehicle load data suffered by the pipeline model 7, the strain gauges 9 are used to collect the axial and circumferential stress-strain of the pipeline under the action of the vehicle load, the displacement meters 11 and the pore water pressure gauges 12 are used to collect the pore water pressure, horizontal and vertical displacement of the pipeline, the monitored data is collected by the dynamic and static acquisition instrument, and the dynamic response characteristics of the buried pipeline under the action of the vehicle load are determined by using the calculation software.

[0031] (4) After the required cycle number is reached, the electro-hydraulic servo high-cycle testing cylinder 1 is unloaded, and after unloading, the power is turned off; the data monitoring device is turned off; the test is ended, and subsequent data processing and related research are carried out.

[0032] The above technical scheme can adjust the frequency setting of the electro-hydraulic servo high-cycle electric cylinder 1, and through the stable and convenient control of the power transmission of the hydraulic actuator 2, the vehicle model 3 driven by the hydraulic actuator 2 can accurately move at the set frequency and speed, and reciprocally load the surface of the soft soil sample 6, and the cycle number can be controlled by the control console 4. The device is used for measuring the vehicle load data suffered by the pipeline model 7 by embedding the earth pressure cell 8 in the soft soil sample 6 around the pipeline model 7, and the strain gauge 9 is arranged in the pipeline model 7, which can be used for monitoring the axial and ring stress-strain of the pipeline model 7 when the pipeline model 7 is subjected to the vehicle load, and the displacement meter 11 and the pore water pressure meter 12 are arranged at the front and rear ends and one side of the pipeline, which can collect the pore water pressure, horizontal and vertical displacement data of the pipeline model 7, and finally the dynamic response characteristics of the buried pipeline under the vehicle load are determined by the dynamic and static collection instrument and the calculation software. The simulation device is used for the vehicle load test on the buried pipeline, and more diverse test data with smaller error can be obtained by adjusting the parameters and the model state, which is more consistent with the actual working condition, and has greater reference effect on the actual pipeline engineering and protection measure design.

[0033] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical scheme of the present application. Any modification, change, equivalent change and modification of the above embodiments, which does not depart from the technical scheme of the present application, belongs to the scope of the present application.

Claims

1. An apparatus for simulating the effect of vehicle loads on a buried pipeline, characterised in that: The model tank, load simulation assembly, data monitoring assembly, soft soil sample and pipeline model, the load simulation assembly includes an electro-hydraulic servo high-cycle electric cylinder and a vehicle model, the soft soil sample is laid in the model tank, the pipeline model is embedded in the soft soil sample, the data monitoring assembly is distributed in the pipeline model and the surrounding soil sample, the vehicle model is placed on the surface of the soft soil sample, and the electro-hydraulic servo high-cycle electric cylinder is connected with the vehicle model and controls the reciprocating movement of the vehicle model.

2. A device for simulating the effect of vehicle loading on a buried pipeline according to claim 1, characterised in that: The model tank is provided with an opening on the side 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 is connected with the vehicle model through the opening of the model tank, and 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 to reciprocally load the surface of the soft soil sample.

3. A device for simulating the effect of a vehicle load on a buried pipeline according to claim 1 or 2, characterised in that: A plurality of weights are arranged on the vehicle model.

4. A device for simulating the effect of a vehicle load on a buried pipeline according to claim 3, characterised in that: The data monitoring assembly includes strain gauges, soil pressure cells, pore water pressure gauges and displacement meters, the strain gauges are uniformly distributed in the pipeline model, the soil pressure cells are dispersedly arranged in the soft soil sample around the pipeline model, and the pore water pressure gauges and displacement meters are embedded in the left and right ends and side surface of the pipeline model.

5. A device for simulating the effect of a vehicle load on a buried pipeline according to claim 4, characterised in that: The pipeline model is composed of at least one socket concrete pipeline model.

6. A device for simulating the effect of a vehicle load on a buried pipeline according to claim 5, characterised in that: The data monitoring assembly is wirelessly connected with an external dynamic and static acquisition instrument.

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