摘要
依托"兰渝客专"胡麻岭隧道工程,研究不同岩层产状(倾角)围岩稳定性,以及支护结构力学响应。结果表明:节理面极大降低隧道围岩稳定性,节理面物理力学性质是隧道围岩失稳的控制性因素;竖向节理隧道失稳以冒顶、坍方为主;当岩层为水平时,其支护结构受力分布合理;倾斜产状节理岩体支护结构受力呈现明显偏压现象;隧道边墙相对稳定,围岩锚杆加固有效长度3 m,拱顶要提高设计参数,有效促进"拱效应"形成,确保隧道稳定性。
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.
出处
《路基工程》
2012年第2期95-98,共4页
Subgrade Engineering
关键词
大断面隧道
节理岩体
支护力学
失稳模式
控制技术
large cross section tunnel
jointed rock mass
support mechanics
instability mode
control technology
