甘肃北山花岗岩节理表面形态特性研究

花岗岩是中国高放废物处置的候选围岩，大量存在的节理面是核素迁移的主要通道，同时节理面对岩体的力学、水力性质起着支配作用。而节理面的表面形态与这些性质密切相关，因此需要对候选花岗岩体节理面展开多样本、大尺寸的现场表面形态研究。以中国高放废物深地质处置甘肃北山预选区某采石场中的天然节理面为研究对象，运用基于几何理论的测量方法，获得了大量不同尺度、不同方位的现场节理面的表面形态特征曲线。采用Barton直边法和统计参数法处理这些特征曲线，系统分析了特征曲线的尺度效应、各向异性特征以及与不同节理类型的关系。为进一步分析裂隙岩体的力学、水力特性建立了基础。

Study of surface configuration characteristics of granite joint in Gansu Beishan area

Granite is the major pre-selected rock type for HLW (High Level radioactive Waste) disposal project in China. Joints existed in it are usually the key factors to effect mechanical and hydraulic characteristics of fractured rock-msss; and it will be the major channel for nuclide to escape from the disposal reservoir to the biosphere when these joints connect to a conductive net. So it is an important work to deep understand these joint’s behaviours. When study these joints, their surface configuration characteristics are the most important aspects necessary to be researched, because most behaviors of joints are determined by these surface characteristics. Lots of in-situ studies of joints surface configuration characteristics are carried out in Gansu Beishan area, where is the pre-selected district to dispose HLW in China. Firstly, some in-situ joints surface profile curves with different length at different directions are obtained. Then, Barton’ straight edge method and a kind of statistics method are used to analyse these curves. Through these studies, scale effect is obviously founded and its threshold value is 70 cm, another characteristics such as anisotropy and the distribution rule of statistics parameters are also obtained. These studies are the basic works to carry out further researches on the mechanical and hydraulic characteristics of granite in this area.