花岗岩体钻孔中结构面的分布规律——以深圳大亚湾花岗岩体为例  

DISTRIBUTION OF DISCONTINUITIES ALONG DRILLHOLES IN GRANITE:CASE STUDY FROM DAYAWAN,SHENZHEN

作　　者：袁广祥[1] 王洪建[1] 黄志全[1] 李建勇[1] 黄向春[1] 万军利[2] 

机构地区：[1]华北水利水电大学资源与环境学院,郑州450045 [2]中国铁道科学研究院,北京100081

出　　处：《工程地质学报》2017年第4期1010-1016,共7页Journal of Engineering Geology

基　　金：国家自然科学基金项目(41402269);河南省高等学校青年骨干教师资助计划(2015GGJS-105);河南省科技创新人才计划(154100510006);河南省重点科技攻关项目(152102210111;132102210113);华北水利水电大学青年科技创新人才项目资助

摘　　要：结构面对工程岩体的强度及其稳定性起着关键作用。在工程选址时常会首先考虑花岗岩作为其地基或围岩,而钻孔揭露的是目标深度岩体最直接的数据。以广东深圳的大亚湾花岗岩体为例,结合地质背景,研究钻孔方向上结构面的分布规律。钻孔方向上花岗岩结构面主要为构造结构面和表生结构面。首先,对比沿钻孔方向花岗岩体中结构面与地表结构面的倾向与倾角,在同一场址区,受到同一构造作用影响,钻孔中与地表节理的产状分布类似。其次,研究沿钻孔方向结构面的间距(直接影响岩体的RQD值),通过间距分组和回归分析,发现结构面间距与其频数具有明显的幂函数关系,且该关系式与RQD值相关。Discontinuities play a key role in the strength and stability of rock mass. During site selection of a project, granite is considered to be the ground or wall rock because of its high strength and integrality. Drillholes are the direct data of the target depth and reveal the rock mass during investigation. In the paper, Dayawan granite at Shenzhen is used as an example can to examine about the distribution of discontinuities in granite. Tectonic and secondary discontinuities are examined along drillhole depth. First, the discontinuities along drillhole and in the ground surface are contrasted. The occurrence distribution is similar because the same tectonic effect at the same site area. Secondly, the distance between two adjacent discontinuities along drillholes are analyzed （ for direct effect RQD of drill cores）.The discontinuity spacing and its frequency have evident power function relationship which is relevant to the RQD value.

关 键 词：花岗岩 钻孔 结构面分布 RQD 

分 类 号：TU452[建筑科学—岩土工程]