摘要
以云南平年隧道为工程背景,采用MARC三维非线性有限元法程序,对新奥法修建的偏压、错台、浅埋小间距隧道模拟了先行隧道不同超前距离情况下的动态施工过程。掌子面距离的变化对洞室的横向位移的影响大于竖向位移,且对于左洞更为显著;随着左右洞掌子面距离的增大,洞周位移、中间岩柱位移均减小,但部分范围内地表沉降值有所增大,局部区域受力、变形恶化。
Taking Pingnian Tunnel in Yunnan,which is the bias closely spaced and shallow twin tunnel with altitude difference in two tunnels and constructed by using NATM,as the engineering background and applying MARC finite element software,non-linear three dimensional numerical simulation of construction process under different lagging distance between the twin tunnel excavated faces is performed. It is found that the change of the excavated face distance has a stronger influence on the horizontal displacement than on the vertical displacement of each tunnel,and especially for the left tunnel. Longer of excavated face distance is,smaller displacements at tunnel periphery and pillar is larger than the ground surface settlement in the special area,and more deteriorative for some zone.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第S1期531-535,共5页
Rock and Soil Mechanics
基金
云南省交通厅科研项目(No.TST(2004)538119B)
教育部"新世纪优秀人才支持计划"(No.NECT-04-0368)。
关键词
小间距隧道
三维数值模拟
新奥法
掌子面距离
unsymmetrical loadings
3D numerical simulation
NATM
excavated faces distance
