【摘要】 为分析降雨和地下水形成的渗流场与应力场的耦合作用,对某大型地下厂房洞室群围岩稳定的影响,根据流固耦合理论,利用二维和三维有限元对地下厂房开挖施工进行数值模拟分析。该厂房最大的特点就是复杂的地质环境,断面形状和尺度庞杂,最主要是有F77大断层横穿主厂房,且遭遇降雨入渗等影响厂房围岩稳定性的恶劣工程环境。因此,基于厂房开挖支护的数值仿真过程,通过是否考虑应力场或渗流场的影响等不同工况进行对比计算分析。依据计算的洞室内渗流量、围岩应力场、变形场以及塑性区分布等结果表明,主厂房和主变室边墙部位以及洞室拐角处需加强支护,且主厂房大断层处在施工过程中需要及时排水与加固处理。耦合作用下,围岩应力和位移均不同程度地增大、塑性区分布范围加深。因此,考虑应力场和渗流场的耦合作用是合理的,并且适时对地下厂房进行防渗和排水是十分必要的。更多还原

【Abstract】 The 2 Dand 3 Dfinite element numerical simulation is applied to analyze the seepage field and stress field coupling impact on surrounding rock stability of the large underground power house after the sustained rainfall and groundwater according to the coupled fluid-mechanical theorem.The underground powerhouse was located in a complex geological environment,so the shapes and sizes of caverns were varied.The main workshop was not only crossed by a large fault F77,but also infiltrated by persistent rainwater.This terrible engineering environment reduced the stability of surrounding rock.Therefore,based on numerical simulation of full process of caving and supporting of underground plant during the whole construction period,the calculated results in different working conditions were compared.Through a numerical analysis of seepage quantity,stress field strength,deformation field strength and the distribution of plastic zone,it was suggested that the main building and the corner of the chamber should need to be strengthened.At the same time the stress and displacement of surrounding rock are increased in different degrees,with the plastic zone also developed by the coupling field force.Accordingly,coupling effect of stress field and seepage field should be considered and calculated seriously,and antiseepage and drainage operation should be done regularly to obtain the stability of rock surrounding the large underground powerhouse.更多还原