【摘要】 岩体力学参数是影响地下工程围岩稳定的重要因素,随着地下洞室开挖进度的发展,岩体力学参数将产生明显变化。为实时反映开挖过程中围岩的力学参数变化,建立正交试验设计效应优化位移反分析法,应用该方法对大岗山水电站地下厂房洞群分步开挖过程中围岩的力学参数进行实时动态反演。利用动态反演的力学参数对各开挖层围岩进行稳定性分析,揭示出洞群开挖过程中围岩位移场、应力场和塑性区的变化规律,反演计算位移值与实测位移值吻合较好。根据分步开挖计算结果,提出地下厂房洞室群的加固处理建议,并及时反馈给设计单位,实时指导和优化工程的设计与施工。更多还原

【Abstract】 The mechanical parameters of rock mass are important factors affecting the surrounding rock stability of underground engineering.With the excavation process of underground caverns,mechanical parameters of surrounding rock mass change significantly.In this study,the back analysis method of performance optimized displacement based on orthogonal test design is established,and then it is applied to the real-time dynamic inversion of mechanical parameters of surrounding rock during the excavation of Dagangshan underground powerhouse.Based on the parameters obtained by the inverse analysis,the stability of caverns during excavation is studied and the variation laws of displacement field,stress field and plastic zone of surrounding rock are also disclosed.It is shown that the inversion calculated displacement values agree well with the measured displacement values.According to the calculation results for staged excavation of underground caverns,the reinforcement treatment recommendations are put forward and feedback is timely provided to the design units,which have been successfully applied to the guidance and optimization of the design and construction scheme of Dagangshan underground powerhouse.更多还原