地表结构面影响下的花岗岩体抗剪强度分析  

Analysis of Shear Strength of Granite Rock Mass Under the Influence of Surface Structural Planes

作　　者：李亚伟[1,2] 王驹 罗辉[1,2] 云龙 LI Yawei;WANG Ju;LUO HUI;YUN Long(Beijing Research Institute of Uranium Geology,Beijing 100029,China;CAEA Innovation Center for Geological Disposal of High-Level Radioactive Waste,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029 [2]国家原子能机构高放废物地质处置创新中心,北京100029

出　　处：《世界核地质科学》2023年第S01期540-546,共7页World Nuclear Geoscience

基　　金：中国国家原子能机构高放废物地质处置创新中心基金资助项目(编号:CXJJ2110-1)资助。

摘　　要：花岗岩中因存在的不规则结构面导致岩体在不同方向上的强度存在较大差异。在选址阶段确定岩体不同方向的力学强度参数有助于未来高放废物地质处置工程的设计与施工。连通率是反应岩体内部结构面贯通程度的重要参数,可以通过确定裂隙岩体连通率来判断工程岩体的综合抗剪强度。在现场结构面测量基础上,采用Monte-Carlo随机方法,模拟出与现场结构面几何分布特征一致的裂隙网络模型。利用裂隙网络模拟对预选区不同剪切方向结构面的连通率和岩体抗剪强度参数进行分析。研究表明:不同方向的结构面连通率和岩体抗剪强度差异性明显,其中产状为146°∠79°方向上的结构面连通率最大,内摩擦力11.92 MPa,内摩擦角44.8°,易发生破坏,需在工程设计与施工过程中予以重视。The presence of irregular structural planes in granite results in significant differences in rock strength in different directions.Determining the mechanical strength parameters of the rock mass in different directions during the site selection stage is helpful for the design and construction of future geological disposal repository for high-level radioactive waste.The connectivity rate is an important parameter that reflects the degree of connectivity of internal structural planes in rock masses and it can be used to determine the comprehensive shear strength of rock masses.On the basis of field structural plane measurement,the paper used the Monte-Carlo random method to simulate a fracture network model that is consistent with the geometric distribution characteristics of the field structural plane.The connectivity of structural planes in different directions was analyzed and the shear strength parameters of rock masses in pre-selected areas were estimated by using fracture network simulation.The results show that the connectivity rate of structural plane and the shear strength of rock mass in different directions are obviously different.Among them,the connectivity of structural planes in the direction of occurrence 146°∠79°is the highest,with an internal friction force of 11.92 MPa and an internal friction angle of 44.8°.It is prone to failure along these connected structural planes and they need to be treated seriously in engineering design and construction.

关 键 词：裂隙岩体 结构面 连通率 抗剪强度 

分 类 号：P553[天文地球—构造地质学] TL942[天文地球—地质学]