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《Chinese Journal of Underground Space and Engineering》 2005-06
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Numerical Simulation of Construction and Excavating Scheme for Shallow Multi-Arch Tunnel Under Unsymmetrical Pressure

DENG Shao-jun~1,YANG Jun-sheng~1,ZHANG Xue-min~1,ZHONG Fang-ping~2(1.School of Civil Engineering and Architecture,Central South University,Hunan Changsha 410075 P.R.China;2.Construction and Exploitation Ltd.of Chang-Ji Expressway,Hunan Changde 415100 P.R.China)  
Zhongxi Tunnel of Chang-Ji Expressway in Hunan Province is a shallow multi-arch tunnel,especially at the region of portal,where the rock mass of the upper portion is obviously a slope,and unsymmetrical pressure will be produced obviously on the tunnel structures.At the initial stages of construction,the rock collapse has occurred within a small region.In order to guarantee normall construction of the project,a representative section is taken as an example for calculation.and a numerical model is set up by use of FLAC2D in this paper.Considering two kinds of construction sequences,the construction mechanical behaviors are simulated.Through comparison of the stress of the surrounding rock,the displacement of the surrounding rock and the internal forces of the supporting structures in tunnel,an excavation scheme is put forward and then it is applied.This can be reference to the choice of construction sequence for shallow multi-arch tunnels under unsymmetrical pressure.
【Fund】: 湖南省交通科技项目(200436)
【CateGory Index】: U455
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