Geometric features of joints and quality evaluation of rock mass in Xinchang section，Beishan
LEI Guangwei1，YANG Chunhe1，2，WANG Guibin2，WEI Xiang1，CHEN Shiwan1，JI Guodong1，HUO Liang1
(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，ChongqingUniversity，Chongqing 400044，China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Insititute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Accurate analysis and evaluation of the geometric features of joints around BS17，BS18 and BS19 boreholes are the major task of site selection and site suitability evaluation of Xinchang section at Beishan，a candidate area in China. Site investigation，mathematical statistics and probability analysis were applied to study the geometric features of joints. 4 joint sets were observed in three boreholes，and the dominant orientations for joints are NE and NW. Joints are mainly shearing and steep dip and obey the normal distribution function. The spacing of joints is a negative exponential function. Wide spacing，long trace length and small trace midpoint density are the main characteristics of Xinchang section. Considering the importance of joints in high-level radioactive repository， method was applied to evaluate the quality of rock mass. The results indicate that the joints of rock mass are little developed and that the differences between the regions are small. Hence，the integrity of rock mass is good. In addition，the existence of faults may promote the joints development along the two sides of the fault in rock mass. The research and evaluation of joints provided important data support for repository site selection and site suitability evaluation
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LEI Guangwei1，YANG Chunhe1，2，WANG Guibin2，WEI Xiang1，CHEN Shiwan1，JI Guodong1，HUO Liang1. Geometric features of joints and quality evaluation of rock mass in Xinchang section，Beishan. , 2016, 35(5): 896-905.
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