Influence Of Site Deformation On Mechanical Properties Of Buried Liquid-Conveying Pipeline Network

The site deformation caused by seismic action,resource mining subsidence and large amount of precipitation has a great threat to the safe operation of buried pipeline network,so it is of great significance to study the mechanical response of buried pipeline network under site deformation.The mechanical properties of buried pipeline network under strike-slip faults and uneven settlement are studied by designing a reasonable three-box test device.The influences of branch pipe diameter,main branch pipe spacing,branch position and soil mass on the mechanical properties of buried pipeline network are studied by strike-slip fault tests.The influences of branch position,buried depth,spacing of main and branch pipes and soil on mechanical properties of buried pipeline network are studied by uneven settlement tests.According to the test results,the following conclusions can be drawn: under the action of strike-slip faults,the strain distribution of pipeline is approximately anti-symmetrical with respect to the fault plane,and the maximum deformation of pipeline network occurs at a certain distance on both sides of the fault plane;reducing the distance between pipelines or increasing the diameter of branch pipeline can effectively improve the ability of pipeline network to resist deformation;the branch of pipeline network is not suitable for distribution;it should be placed near the fault plane.In construction design,the pipeline should be chosen as soft as possible.Under the action of uneven settlement,the maximum strain of main pipeline lies in the middle of settlement area,and the maximum strain of branch pipeline appears in the fixed area near the interface;the branch of pipeline network should not be arranged in the middle of settlement area;shallow burial and reducing the spacing between pipelines can effectively improve the ability of pipeline network to resist deformation,and overlay pipeline.The use of light weight and soft soil can reduce the force of the soil on the pipe.Figure 44;Table 17;Reference 50...