锦屏一级水电站左岸1601m廊道岩体质量指标研究  

Study on rock quality designation of 1601m long gallery on left bank of Jinping Ⅰ Hydropower Station

作　　者：朱晓珍 章光[1] 胡少华[1,2] 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水利水电技术》2017年第12期159-167,共9页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金青年基金项目(51609184);中国博士后科学基金资助项目(2015M580672);金属矿山安全与健康国家重点实验室开放基金资助项目(2016-JSKSSYS-01)

摘　　要：岩石质量指标(RQD)是评价岩体质量的一个重要参数,被广泛应用于岩石质量评价,但通过钻孔取芯方式获取RQD存在明显不足,给岩体质量评价带来了一定的误差。以锦屏一级水电站左岸廊道岩体为实例,结合结构面三维网络模拟技术,采用测线法研究了广义RQD_t随测线布置长度与角度的变化情况。在此基础上分析了岩体的尺寸效应和各向异性。研究结果表明:RQD_t存在显著的尺寸效应,随着测线长度增大至10 m,RQD_t收敛于一个稳定的值;随着测线倾向和倾角的变化,RQD_t沿空间不同方向呈现出不同的分布。研究发现锦屏一级水电站左岸1 601 m廊道岩体具有显著的尺寸效应和各向异性,基于广义RQD_t的岩石质量指标能克服传统RQD在这方面的不足。Rock quality designation（RQD） is an important parameter for evaluating the quality of rock mass and then widely applied to rock quality evaluation. However,obvious deficiencies are there for obtaining RQD through core-drilling,which brings a certain error to the quality evaluation of rock mass. By taking the rock mass of the gallery on the left bank of Jinping I Hydropower Station as an actual case,the change of the generalized RQDtalong with the length and angle of scan-line is studied with the scan line method in combination with the 3-D network simulation technology. On the basis of this,the size effect and anisotropy of the rock mass are analyzed. The study result shows that RQD_t has a significant size effect and converges to a stable value along with the scan-line length being increased to 10 m,while following with the changes of the dip direction and dip angle of the scanline,RQDtexhibits different distributions along different spatial directions. It is found out from the study that the rock mass of the1601 m-long gallery on the left bank of Jinping I Hydropower Station has significant size effect and anisotropy,thus the deficiencies of the conventional RQD in the this aspect can be overcome based on the generalized RQDt.

关 键 词：岩体 广义RQDt 各向异性 尺寸效应 锦屏一级水电站 

分 类 号：TV221.2[水利工程—水工结构工程]