摘要
穿越断裂带的隧道在铁路工程、水利工程、公路工程较为常见,由穿越断层破碎带所诱发的工程地质灾害占我国隧道灾害总数的50%以上,保证穿断层带隧道的安全稳定是发展我国隧道工程的重中之重。以他白依隧道为工程背景,探究围岩在断层破碎带影响下的有效支护措施。为解决他白依隧道软岩大变形问题,本文首先通过开展现场点荷载试验、地应力试验及室内矿物成分分析试验来探究形成大变形原因的主控因素,之后针对他白依隧道变形力学机制提出高预紧力长短NPR锚网支护方案,依据开挖补偿理论利用NPR锚索的高预紧力对隧道围岩进行应力补偿,并通过数值模拟与现场监测说明隧道在高预紧力长短NPR锚网支护方案下能够有效减少围岩在断层破碎带影响下产生的大变形。该研究成果可为穿越断层带的隧道支护提供参考。
Tunnels crossing fault zones are common in railway engineering,water conservancy engineering and highway engineering.Engineering geological disasters induced by crossing fault fracture zones account for more than 50%of the total number of tunnel disasters in China.Ensuring the safety and stability of tunnels crossing fault zones is the top priority in the development of tunnel engineering in China.Based on the engineering background of Tabaiyi Tunnel,this paper explores the effective support measures of surrounding rock under the influence of fault fracture zone.In order to solve the problem of large deformation of soft rock in Tabaiyi Tunnel,this paper first explores the main controlling factors of large deformation by carrying out on-site point load test,in-situ stress test and indoor mineral composition analysis test.Then,according to the deformation mechanism of Tabaiyi Tunnel,a high pre-tightening force and long-short NPR anchor net support scheme is proposed.According to the excavation compensation theory,the high pre-tightening force of NPR anchor cable is used to compensate the stress of tunnel surrounding rock.Through numerical simulation and field monitoring,it is shown that the tunnel can effectively reduce the large deformation of surrounding rock under the influence of fault fracture zone under the high pre-tightening force and long-short NPR anchor net support scheme.The research results can provide reference for tunnel support crossing fault zone.
作者
曹振生
徐海斌
虎晓敏
张光逵
刘珂源
Cao Zhensheng;Xu Haibin;Hu Xiaomin;Zhang Guangkui;Liu Keyuan(China Power Construction Honghe State Construction Geyuan Highway Co.,Ltd.,Honghe Autonomous Prefecture,Yunnan 661199,P.R.China;Southwest Regional Headquarters,China Power Construction Road and Bridge Group Co.,Ltd.,Chongqing 401120,P.R.China;State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining&Technology(Beijing),Beijing 100083,P.R.China;School of Mechanics&Civil Engineering,China University of Mining&Technology(Beijing),Beijing 100083,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第6期2122-2132,共11页
Chinese Journal of Underground Space and Engineering
关键词
隧道工程
断层破碎带
变形力学机制
NPR锚网支护
数值模拟
tunneling engineering
fault fracture zone
deformation mechanical mechanism
NPR anchor mesh support
numerical simulation
