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准确分析和评价BS17,BS18和BS19钻孔周边岩体节理几何特征,是我国高放废物处置北山预选区新场地段场址筛选及适宜性评价的重点内容和关键步骤之一。通过现场调查、数理统计和概率分析等方法,对该地区的岩体节理几何特性进行研究,结果表明:(1)各钻孔均发育4个节理优势组,尤以NE向和NW向最发育;(2)节理倾角以陡倾角的剪节理为主,节理产状服从正态分布函数,节理间距可用负指数函数进行有效拟合;(3)节理平均间距宽,迹长长,中点面密度小。基于岩体节理在高放废物处置库工程安全运行中的重要性。采用JSR法对岩体节理发育特征进行综合评价,发现新场地段3个钻孔周围岩体节理发育程度轻微、区域差异性小、岩体完整性好,断层对其两侧岩体的节理发育有促进作用,研究结果可为北山预选区处置库场址筛选和场址适宜性评价提供必要的数据支持。
Accurately analyzing and evaluating the geometrical characteristics of rock mass joints near BS17, BS18 and BS19 boreholes is one of the key contents and key steps in site selection and suitability evaluation of new site for Beishan pre-selected area for China’s high-level radioactive waste disposal. By means of field survey, mathematical statistics and probability analysis, the geometrical characteristics of rock mass joints in this area are studied. The results show that: (1) Each of the four boreholes has four dominant groups of joints, especially NE and NW ; (2) The joint inclination is dominated by shear joints with steep inclination, and the joint shape obeys the normal distribution function. The joint spacing can be effectively fitted by the negative exponential function. (3) The average joint spacing is wide, the trace length is long, Low density. Based on the importance of rock mass joints in safe operation of HLW repository. JSR method is applied to comprehensively evaluate the characteristics of rock mass joint development. It is found that the rock mass joints around the three boreholes in the new site have a slight degree of joint development, small regional differences and good rock integrity. The research results can provide the necessary data support for site screening and site suitability evaluation of Beishan Preselected Area.