The analysis of surface subsidence caused by Pipe roof Reinforcement method construction in Hunhe Underdrain

摘要

This paper is used to study on analysis and prediction of surface subsidence caused by pipe roof reinforcement method construction. Take one of the Shenyang's sewage disposal projects to be investigated, it monitored on field surface subsidence in construction of underdrain. During measurement and monitoring, except for conventional measurement of surface subsidence according to code and peripheral convergence and so on, in order to analysis changes of stress and strain of the pipe roof in whole construction of underdrain. it respectively arranges JMZX-212 intelligent string type of strain gauge in both internal and external sides of vault and hance. It used the Element Birth/Death of finite element software basing on field data, using elastic-plastic and nonlinear finite element method. Material constitutive relationship used mohr-coulomb model, simulating process of tunnel of excavation and support, researching and stimulating surface subsidence. Value of surface settlement was calculated via numerical simulation in applying finite element theory, it based on prototype of engineering, which was in accord with measurement value in field. The correctness of soil constitutive model chosen and boundary conditions used is verified, meanwhile, numerical simulation shows validity of method.