摘要
结合某工程,建立了三维弹塑性有限元模型,就隧道的开挖施工过程进行了数值模拟,用强度折减法原理计算得到在左洞先挖和右洞先挖两种施工方法下边坡的安全系数,并探讨了不同开挖顺序对隧道和边坡稳定性的影响。得出了坡体的安全系数随施工的进行逐渐减小、最后趋于稳定的结论,以及对于偏压连拱隧道,先开挖靠边坡外侧的隧洞对边坡的稳定和隧道的安全更加有利。文章最后分析了边坡的破坏失稳机理,提出需加强观测以及采取一定加固措施的建议。其结论对隧道的施工方法具有指导意义。
Taking Madihe twin tunnel as an example, a 3 D nonlinear FEM simulation on the dynamic excavating procedure is processed. An analysis on safety factor of slope by two different construction methods, through strength reduction method is presented. The results show that the excavation has great effect on the safety factor. During the excavation, the safety factor is reduced gradually and finally it tends to be stable. For unsymmetrical loaded twin tunnel, it is beneficial to slope and tunnel by excavating the hole near the outside of slope firstly. The reason of slope unstability is studied. It suggests to intensify observation and take certain reinforcing measures. The results have important guiding significance for tunnel construction.
出处
《地下空间与工程学报》
CSCD
2007年第3期483-487,493,共6页
Chinese Journal of Underground Space and Engineering
基金
西部交通建设科技项目(200231800022
200331849018)
上海市重点学科(岩土工程)资助
作者简介
李新星（1978-），女，山西人，博士研究生，从事隧道及地下建筑工程和地下空间数字化工程研究工作。E-mail：lxxxinyue@163．com
