摘要
古堰塞湖相沉积地层是川西地区公路建设过程中易遇到的软弱地层。本文以川主寺隧道进口段为典型工程实例,对穿越这一特殊地层隧道围岩失稳问题及稳定性控制技术开展系统研究:基于可拓学理论对古堰塞湖相沉积地层围岩等级进行了精确划分,并通过数值模拟手段探讨了川主寺隧道进口段围岩失稳破坏机理,在此基础上,提出了可行的开挖支护方案建议。本文研究方法及主要结论对于指导穿越古堰塞湖相沉积地层隧道建设具有重要的现实意义。
Paleo-dammed lake deposits are commonly encountered soft strata during the construction of highways in Western Sichuan.This study takes the entrance section of the Chuanzhusi tunnel as a typical example;systematically investigates the instability problems and corresponding treatment techniques of surrounding rocks in a tunnel traversing the peculiar strata.Based on the extenics theory,the quality of surrounding rocks of the tunnel was classified precisely.Moreover,the deformation mechanism of the surrounding rocks was investigated using numerical modeling.Consequently,feasible excavation and support schemes were proposed.The research method and main conclusions of this paper are of great practical significance to guide the construction of tunnel traversing the paleo-dammed lake deposits.
作者
李宗有
燕俊松
沈中超
LI Zong-you;YAN Jun-song;SHEN Zhong-chao(Sichuan Communication Surveying&Design Institute,Chengdu 610017,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《地质灾害与环境保护》
2020年第2期46-50,56,共6页
Journal of Geological Hazards and Environment Preservation
基金
国家自然科学基金(编号:41572308)
四川省交通科技项目(编号:2014D-6)。
关键词
古堰塞湖
湖相沉积
隧道
围岩质量分级
稳定性控制
paleo-dammed lake
deposits
tunnel
quality classification of surrounding rocks
stability control
