岩体赋存的地质力学环境对地下洞室稳定性影响研究

The Influence of Geo-mechanical Environment on the Stability of Underground Rock Caverns

岩体赋存的地质力学环境直接影响地下洞室的稳定性,以西部地区某水电站地下厂房为背景,通过设计不同地质结构、岩体力学参数和初始应力场,采用弹塑性有限元数值计算开展了多种方案组合下的开挖模拟分析,探讨了不同的断层岩脉、岩体力学特性、初始应力场对地下洞室群开挖完成后的位移场、应力场和塑性区的影响,得到了一些有意义的规律和认识,可为地下洞室群的设计与施工提供参考和指导。

The stability of underground rock caverns is affected by the geo-mechanical properties their surrounding rock mass. This paper presents a stability evaluation of an underground rock cavern during the rock excavation for a hydropower generation station in western China. The evaluation considered various combination of structural geological conditions, rock mass property as well as initial geo-stress field conditions by using elasto-plastic finite element analysis for different rock excavation sequences. The influence of different geological faults, rock properties and initial stress conditions on the deformation, stress and plastic zones in the cavern are discussed. The results can be used for the design and construction of underground rock cavern under similar conditions.