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鸡公山斜坡岩体裂隙网络模拟及强度参数研究 被引量:4

Research on fracture network simulation and parameters of shear strength of the Jigongshan slope
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摘要 文章以四川省石棉县鸡公山斜坡为例,首先基于现场调查和物探方法确定裂隙网络模拟有效尺寸,然后采用MonteCarlo法对岩体裂隙连通率和强度参数进行裂隙网络模拟,研究结果表明:裂隙连通率与裂隙发育特征以及裂隙优势方向与斜坡夹角之间有着密切关系。斜坡浅表部强风化带岩体在不同的方向,其裂隙连通率在0~98%之间,对应的岩体内聚力在0.16~2 MPa之间,内摩擦系数在0.62~1.5之间。最后得到鸡公山斜坡浅表部强风化带岩体强度参数:C=0.2 MPa,f=0.7。研究成果证实了裂隙的发育特征对岩体的力学性能以及可能的失稳破坏方向有重要的影响。 Parameters of shear strength have important effect on the stability of slopes. Taking the Jigongshan slope in Shimian County of Sichuan Province as an example,this article determines the valid dimensions of the fracture network simulation based on field investigation and geophysical survey,and carries out the simulation for the fracture connectivity and parameters of shear strength by means of Monte- Carlo method. The research results show that the fracture connectivity is closely related to the development features of fracture and the fracture advantage is closely related to the ramp angle. The rock masses in the heavily weathered zone at the shallow surface of the slope are located in different locations,with the fracture connectivity ranging between 0and 98%. The cohesion of rock masses ranges from 0. 16 MPa to 2 MPa,and the internal friction coefficient,from 0. 62 to 1. 5. Therefore,the intensity of the heavily weathered rock masses on the shallow surface of the Jigongshan slope is calculated as C = 0. 2 MPa,and f = 0. 7. The results demonstrate that the development characteristics of fracture have significant impacts on the mechanical parameter of the rock masses as well as on the possible stability failure direction.
出处 《水文地质工程地质》 CAS CSCD 北大核心 2016年第3期153-158,共6页 Hydrogeology & Engineering Geology
基金 中国地质调查局国土资源大调查项目资助(12120114069501 DD20160272)
关键词 鸡公山斜坡 裂隙网络模拟 强度参数 裂隙连通率 Jigongshan slope fracture network simulation parameters of shear strength fracture connectivity
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