【作者】 王旭； 晏鄂川；

【Author】 WANG Xu, YAN E-chuan (Faculty of Engineering, China University of Geosciences, Wuhan 430074, China)

【机构】 中国地质大学(武汉)工程学院；

【摘要】 岩体结构面通过几何学和力学两方面影响岩体稳定性。因此,可将结构面连通性研究分解为2类问题:(1) 反映空间方位效应及岩体水力学特性的几何学连通性;(2)反映岩体强度的力学连通性;从两方面能更全面的反映岩体结构面的工程性质。首先采用单测线法对节理岩体结构面进行统计测量,对获取的结构面的产状和迹长进行取样偏差校正和蒙特卡洛模拟,从而形成结构面网络模型。然后,对网络模型进行分析与计算,得到结构面在几何学意义上的连通性;并由网络模型寻求真正的优势控制性结构面。最后,以此类优势结构面为基础,与其他随机结构面进行耦合分析,结合岩桥破坏机制,运用动态规划方法搜索抗剪力最小路径,得到更符合工程实际的结构面在力学意义上的连通率。更多还原

【Abstract】 Through the two aspects of geometry and mechanics, stability of rock mass is influenced by discontinuities. Therefore, connectivity research of discontinuities in jointed rock mass is analyzed at two aspects: (1) geometrical connectivity reflecting hydromechanics of rock mass and spatial orientation effect of discontinuities; and (2) mechanical connectivity reflecting strength of rock mass; thereby engineering properties of discontinuities are more disclosed generally. In the paper, discontinuities in the jointed rock mass are measured by means of surveying line sampling method, and orientation and trace length of discontinuities are corrected and Mote-Carlo simulated, thus the discontinuities’ network models are formed. Then the network models are analyzed and calculated, therefore geometrical connectivity is acquired; and prevailing discontinuities are found through discontinuity network model. Based on the prevailing discontinuities, a method is presented to perform persistence analysis by coupling these prevailing discontinuities with other random discontinuities. And according to the rock-bridge failure theory, shear paths with minimum shearing force are searched by using dynamic programming, then reasonable mechanical persistence ratio of discontinuities, which is more conformed to the engineering practice, can be achieved based on this method.更多还原