【摘要】 蟠龙抽水蓄能电站地下厂房系统多跨越软硬间层的地质区,软岩地质区的洞室围岩稳定问题突出。结合工程建立了包含洞室群与软、硬岩层的三维整体有限元模型,采用三维非线性有限单元法,研究了洞室群开挖过程中软岩层的变形规律和应力状态。分析表明:开挖过程对软岩层扰动显著,开挖完成后,软岩层最大变形量在沿厂房轴线方向为24. 3 mm、垂直厂房轴线水平方向为50. 2 mm、铅直方向为35. 5 mm;厂房区出现一定范围的塑性区。从工程安全角度考虑,建议在地下厂房开挖前进行开挖过程对软岩层的影响分析。更多还原

【Abstract】 The underground powerhouse system of Panlong Pumped-storage Power Station passes through soft and hard alternating rock stratum,the stability problem of surrounding soft rock around caverns is prominent. A three-dimensional nonlinear finite element model including cavern group and soft and hard rock strata is established,and the deformation law and stress state of soft rock during the excavation of cavern group are studied. The analyses show that the excavation process disturbs the soft rock strata significantly. After excavation,the maximum deformations of soft rock are 24. 3 mm along the axis of powerhouse,50. 2 mm along the horizontal direction vertical to powerhouse axis and 35. 5 mm along the vertical direction respectively. A certain range of plastic zones appear in underground powerhouse area. From the perspective of engineering safety,it is recommended to analyze the response of excavation process to surrounding soft rock before the underground powerhouse is excavated.更多还原