摘要
Abstract
Depending on Humaling Tunnel Project for ＂Lanzhou-Chongqing Passenger Dedicated Line＂, the stability of surrounding rock with different attitudes of rock formation （obliquity） and the mechanical response of supporting structure are studied. The results show that the joint surface decreases greatly the stability of tunnel surrounding rock and the physical-mechanical properties of the joint surface is the controlling factor to the unstability of tunnel surrounding rock. The instability of vertically jointed tunnel mainly presents roof fall or collapse ; the mechanical distribution of supporting structure is reasonable in level joints, the support structure for jointed rock with oblique attitude is obviously under partial press; the tunnel sidewall is relatively stable. The effective length for bolt reinforcement in surrounding rock is 3 m and the arch crown shall be improved the design parameters so as to promote the formation of ＂ arch effect＂ effectively and guarantee the stability of tunnel.关键词
大断面隧道/节理岩体/支护力学/失稳模式/控制技术Key words
large cross section tunnel/jointed rock mass/support mechanics/instability mode/control technology分类
建筑与水利
