摘要
在对深埋隧洞破坏模式进行分析的基础上,基于分析结果针对性建立其安全监测系统的布置方法,可以有效维护隧洞施工期和运行期的长效安全。以滇中引水工程某深埋隧洞为例,在综合考虑工程地质条件、围岩状态、开挖形式的基础上,首先选取典型隧洞断面进行数值模拟,采用有限元强度折减法进行深埋隧洞典型破坏模式分析,获得了隧洞围岩应力与塑性区分布,得到了深埋隧洞潜在破坏面的分布情况。结合数值模拟分析结果,确定了安全监测原则及安全监测重点防控点。针对深埋隧洞潜在破坏面进行了两类围岩的安全监测测点布置。研究成果可为深埋隧洞工程安全监测系统优化设计提供依据。
In accordance with the analysis of the failure mode of deep-buried tunnel,a layout method for its safety monitoring system is targetedly established herein on the basis of the analysis result,by which the long-term safety of the tunnel can be effectively maintained during its construction and operation periods.By taking a deep-buried tunnel of Mid-Yunnan Water Diversion Projectas the study case,the typical cross-sections of the tunnel are selected for numerical simulations under the comprehensive consideration of the engineering geological condition,the surrounding rock status and the excavation pattern at first,and then the failure mode of the deep-buried tunnel is analyzed with finite element strength reduction method;from which the distribution of the stress and plastic zones of the tunnel surrounding rock is got,thus the distribution of the potential failure planes of the deep-buried tunnel is obtained as well.Combining with the analysis result from the numerical simulation,the safety monitoring principle and the key safety control points are determined.For the potential failure planes of the deep-buried tunnel,the layouts of the safety monitoring points for two types of surrounding rocks are made.This study result can provide a basis for the optimal design of the safety monitoring system for the project of deep-buried tunnel.
作者
徐俊豪
李宏恩
刘晓青
XU Junhao;LI Hongen;LIU Xiaoqing(College of Water Conservancy and Hydropower,Hohai University,Nanjing 210098,Jiangsu,China;Nanjing Hydraulic Research Institute,Nanjing 210001,Jiangsu,China)
出处
《水利水电技术》
北大核心
2019年第10期125-130,共6页
Water Resources and Hydropower Engineering
基金
国家重点研发计划项目(2016YFC0401809,2017YFC0405006)
国家自然科学基金项目(51579154)
中央级公益性科研院所基本科研业务费项目(Y717012,Y718001)
关键词
深埋隧洞
破坏模式
有限元强度折减法
安全监测
deep-buried tunnel
failure mode
finite element strength reduction method
safety coefficient