摘要
针对高应力下地下工程变形破坏的特点,提出高应力下地下工程稳定性的综合集成智能分析与动态设计优化的新思路,即以工程区域地应力、地质构造特征、高应力下的应力路径改变的岩石(体)变形破坏机制以及与之相对应的模型识别、基于新评价指标(局部能量释放率、破坏接近度)的确定性与不确定性方法结合的围岩稳定性分析、考虑多方面的开挖与全局支护优化、基于现场最新监测和开挖揭示的工程地质信息的动态反馈分析等为主线,给出高应力地区三维地应力场特征识别的新方法、高应力下硬岩本构模型识别的新方法、地下工程安全性评价新方法以及动态反馈智能分析与优化设计方法。该新思路和新方法成功地进行了拉西瓦水电站和锦屏II级水电站地下厂房稳定性的动态反馈分析和设计优化。
According to key features of deformation and failure of surrounding rocks at high geostresst,he way for stability analysis and design optimization of underground engineering in hard rock with high geostress is proposed.It includes recognition of geological conditions and geostress in the studied zones,the mechanism of deformation and failure of surrounding rocks due to change of stress paths induced by excavation under high geostress condition,new constitutive model corresponding to the damage degree of surrounding rocks,new indexes including local energy release rate and failure approach index,global optimization of excavation procedure and support schemes,and dynamic feedback analysis and design optimization based on the monitoring information.Some new methods have been proposed to carry out these tasks mentioned above.They have been used to some typical engineerings such as the underground powerhouses of Jinping II Hydropower Station and Laxiwa Hydropower Station.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第7期1341-1352,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金雅砻江联合基金项目(50539090)
国家重点基础研究发展规划(973)项目(2002CB412708)
关键词
地下工程
稳定性智能分析
动态优化
隧道
硬岩
高应力
underground engineering,intelligent stability analysis,dynamic optimization,tunnel,hard rock,high stress
