新疆阿奇山地段岩体节理特征研究

Study on Rock Mass Joint Characteristics of Aqi Mountain Quarry in Xinjiang Province

我国高放废物处置库新疆预选区的阿奇山地段是有利候选地段之一。本次在阿奇山地段进行详细的地质节理调查,以地表露头及采石坑内的节理为主要对象,通过现场节理调查取得节理数据,共测得3680条节理数据。进行节理几何特征的概率分析,对岩体赋存的结构条件进行有效、准确的描述和定量分析,准确地确定岩体节理的分布。由结果可以看出阿奇山地段的岩体节理以陡倾角的剪节理为主,且节理倾向和倾角符合正态分布规律,节理间距用负指数分布规律很好表示,阿奇山地段各区域的节理间距属于宽间距,由此表明此地段岩体完整性较好。本次研究得到阿奇山地段岩体节理基本特征参数,为高放废物深地质处置库的选址、概念库设计以及进行核素迁移规律研究提供翔实的资料。

Aqi Mountain quarry in Xinjiang province is one of the candidates as the preselected area for Chinese high-level radioactive waste repository. Taking outcrop quarry pit and joints as the main target,data of 3680 groups of granite joints mapped in Aqi Mountain quarry are acquired. Based on the probability analysis of joints＇ geometric features,accurate description and quantitative analysis of rock structural conditions are conducted to accurately determine the distribution of rock joints. The joint inclination and dip angle can be effectively fitted by normal function,and the joint dip angles are mostly steep. The joint spacing is calculated and it can be effectively fitted by negative exponential function. According to＂suggested methods for quantitative description of discontinuities in rock mass＂（ ISRM,1978）,the joint spacing of each rock mass region is wide. The quantitative parameters that can be used to describe the rock mass joint characteristics are obtained. They are essential for providing necessary data to support the construction of high-level radioactive waste repository.