摘要
深埋隧洞围岩强度和应力水平矛盾突出,破坏模式多样,但缺乏相应的支护设计经验。以锦屏二级水电站深埋隧洞为工程背景,对深埋围岩容易出现的破坏模式进行了系统的总结,并深入分析了不同破坏模式隐含的深层次力学机理。高应力破坏风险和程度的不同也决定了锚杆类型选择和参数设计。为此,系统分析了目前地下工程中常用的水胀式锚杆、涨壳式锚杆和螺纹钢锚杆的工程特性和力学特性,并针对锦屏二级深埋隧洞工程进行了适应性评价。研究成果可以为类似的工程提供直接的经验借鉴和技术支撑。
The contradiction between strength and stress of surrounding rock in deep buried tunnel is prominent,and the failure modes are various,but lack of corresponding support design experience.Taking the deep buried tunnel of JinpingⅡhydropower station as the engineering background,the failure modes that are easy to appear in the deep-buried surrounding rock are systematically summarized,and the underlying mechanical mechanism of different failure modes is deeply analyzed.The different risk and degree of high stress failure also decide the bolt type selection and parameter design.For this reason,the engineering and mechanical characteristics of water expansion bolt,shell expansion bolt and spiral steel bolt which are commonly used in underground engineering are systematically analyzed,and the adaptability of JinpingⅡdeep buried tunnel engineering is evaluated.The research results can provide direct experience and technical support for similar projects.
作者
刘宁
陈平志
陈涛
Liu Ning;Chen Pingzhi;Chen Tao(HydroChina Huadong Engineering Corporation,Hangzhoug 311122,China)
出处
《科技通报》
2020年第9期20-25,共6页
Bulletin of Science and Technology
基金
国家自然科学基金雅砻江联合研究基金(U1765206,U1865203)
关键词
深埋隧洞
高地应力
围岩破坏
支护优化
deep buried tunnel
high geostress
surrounding rock failure
support optimization
作者简介
刘宁(1981-),男,工学博士,正高级工程师,主要从事岩石力学与地下工程方面的研究。E-mail:liu_n@ecidi.com。
