Underground Drainage Pipes Leakage To Ground Subsidence

Underground pipeline is the normal operation of urban infrastructure to guarantee, the most important to human life has brought great convenience. Pipeline transport is widely recognized as the world's most safety and economical method to transport energy. Especially in cities, the pipe has become the underground lifeline to keep city security and normal operation. However, in the huge underground pipe list, there are many safe hidden trouble, the underground pipes accident type can be divided into two kinds from big field, one is due to the high temperature medium in underground pipeline flow generated in the heating effect the negative impact on the environment; the other is pipeline leak due to the pipe material and the defects of pipe technology or the weather, the geology and artificial damage reasons, that change the soil's mechanics performance of the underground tube changes affect the normal operation of the soil structure.The surface subsidence accident due to drainage pipeline leakage are very typical, drainage pipes burst in forms around the pipeline after seepage field, seepage field with surrounding soils in the coupling effect, can lead to the change of soil mechanics properties, produce the "groundwater capsule" once meet the influence by ground or underground construction, the ground collapse occurs accidents will be happen. Not only increased the cost of manufacture but also cause casualties. Hence it is very necessary to go into this problem and to take the corresponding measures to prevent the engineering accident.Aiming this problem, the paper using finite element software to proceed numerical simulation, using the conclusion can discovery pipeline leakage accidents and convenient for detecting the pipeline leak point timely, thus ensuring the ground of construction safety. This paper studies the following aspects:Firstly, Introduces the relevant knowledge of underground pipeline leakage and ground collapse, analyzes the main causes and characteristics of pipeline leakage and ground collapse of;Secondly, Introduces the seepage and the soil constitutive model, and puts forward the soil stability judgment basis, with ANSYS software, proves the hot-structural coupling module simulation of soil mechanics seepage field effect on the performance of feasibility,Thirdly, to the seepage field and seepage field and stress field of the coupling precede numerical simulation analysis. In-depth analysis the seepage's influence to the soil and the seepage field area, and thus analysis on the surrounding soils'changes caused by seepage;Finally, analyze the influence of the soil cause by leakage aperture, leakage speed and pipeline buried depth three factors'change; The paper use the finite element software proceed numerical simulation, the calculation result close to the actual measurement related in literature, so the conclusion has high accuracy and reliability, and it can reflect the actual situation.