Analysis On The Influence Of Deformation Performance Of The Joints Of Fabricated Pipe Gallery Under Uneven Settlement

With the rapid development of Chinese social economy and the increasing proportion of urbanization,there is a shortage of construction land in various cities,and the country has begun to focus on the development of underground structures.Especially in recent years,the underground pipe gallery has been vigorously constructed in many cities,which can solve the problem of repeated excavation of ground roads for laying pipelines,avoid resource waste and ensure the normal operation of urban functions.However,during the construction of underground pipe gallery,how to better solve the problem of water leakage is always worth studying.At present,there are a large number of segmented joints in the prefabricated pipe gallery.Although the elastic sealant strip is used to solve the waterproof problem of joints in the pipe gallery,it has achieved good results.However,under the uneven settlement caused by geological disasters or other reasons,the joints pipe gallery will be deformed and the opening amount of joints will be increased,and the contact pressure between sealant strip and concrete interface will be reduced,resulting in the decline of waterproof ability of pipe gallery joint and leakage of water.In this paper,the prefabricated pipe gallery under the fault displacement and soil subsidence caused by mining subsidence is taken as the research object.The response rule of prefabricated pipe gallery under the corresponding displacement load is analyzed,and the waterproof performance degradation of longitudinal joints of pipe gallery is analyzed combined with the existing test data.The main work of the paper is as follows:1.By Using ABAQUS software to establish the finite element analysis model of the prefabricated pipe gallery acrossing fault.Under the action of normal faults and reverse faults,the influence of fault displacement,buried depth,friction coefficient of pipe soil and angle of pipe gallery crossing fault plane on the response of pipe gallery is systematically analyzed.The distribution characteristics of the vertical relative displacement and the longitudinal horizontal opening displacement of the top and bottom plates at the pipe gallery joints are mainly analyzed,and the weak waterproof position of the joints of the prefabricated pipe gallery under the action of the fault displacement is determined.2.By Using ABAQUS software to establish the finite element analysis model of the prefabricated pipe gallery under the overall settlement of the soil.The influence of the length and displacement of the subsidence area on the vertical relative displacement and the longitudinal horizontal opening displacement of the roof and floor at the pipe gallery joints are analyzed systematically.Paramenteic analysis is carried out on three influencing factors: buried depth,elastic modulus of soil and friction coefficient of pipe soil.3.Based on the elastic foundation beam theory and the energy variational method,the longitudinal deformation of the prefabricated pipe gallery in the subsidence area caused by the integral settlement of the soil is analyzed theoretically,and the distribution of internal force and displacement of the pipe gallery is obtained.The analytical solution is compared with the finite element simulation solution to verify the correctness of each other,and the influence of the longitudinal stiffness on the settlement of the pipe gallery is analyzed.4.Combined with the relevant test data of four kinds of sealant strips,the changeable rule of waterproof performance of longitudinal joint of double cabin pipe gallery under uneven settlement is analyzed,and the correlation analysis of joints opening,adhesive strip interface stress and ultimate water resistance pressure is carried out.The research work in this paper will provide a scientific basis for the construction and design of prefabricated pipe gallery across the area with frequent geological disasters.