【作者】 刘晓丽； 王恩志； 王思敬； 韩国锋；

【Author】 LIU Xiaoli~1,WANG Enzhi~1,WANG Sijing~(1,2),HAN Guofeng~1 (1.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China; 2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

【机构】 清华大学水沙科学与水利水电工程国家重点实验室； 中国科学院地质与地球物理研究所；

【摘要】 对含单个圆形孔洞、单个椭圆形孔洞以及多个随机椭圆形孔洞的饱和岩体进行了受力分析,结合岩体工程中常用的破坏准则,研究了饱和岩体孔洞中的极限许用水压力值。提出了含孔洞饱和岩体的水力敏感性表征系数,用于定量化表述孔洞尺度和孔洞形状对孔洞水力作用的影响。研究结果表明,水力敏感性表征系数随着孔洞尺度和孔洞含量的增大而增大。对于含椭圆形孔洞的岩体,椭圆孔洞的长半轴与短半轴比值越大,水力敏感性表征系数越大。孔洞水力敏感性表征系数能够反映岩体孔隙中水力作用的影响程度,孔洞水力敏感性表征系数越大,表明孔隙水力作用越显著。更多还原

【Abstract】 Stress analysis was conducted for the saturated rock mass with single circular cavity,single elliptic cavity and multiple random elliptic cavities under complex loads.The maximum permissible water pressure in saturated rock mass was studied by the failure criteria of rock mass.A new concept named hydraulic sensitivity representation coefficient was presented to describe quantitatively the hydraulic effects of cavity scale and cavity shape on the rock mass strength.The result showed that hydraulic sensitivity representation coefficient increased with the increases of the cavity scale and cavity content.For the rock mass with elliptic cavities,the hydraulic sensitivity representation coefficient increased with the increase of the ratio of the semimajor axis to the semiminor axis.The hydraulic sensitivity representation coefficient could reflect to the effect degree of the pore water pressure on the rock mass strength,and the bigger the hydraulic sensitivity representation coefficient was, the more prominent the pore water pressure was.更多还原