坝基岩体岩石质量指标、波速和透水率的关系——以青海玛沁地区玛尔挡水电站为例  

Relationships Among Rock Quality Designation,Wave Velocity and Permeability of Dam Foundation Rock Mass——Taking Ma'erdang Hydropower Station in Maqin Area of Qinghai,China as an Example

作　　者：陈康达 宋彦辉[1,2] 巨广宏 戎娟 陈子玉 CHEN Kang-da;SONG Yan-hui;JU Guang-hong;RONG Juan;CHEN Zi-yu(School of Geology Engineering and Geometics,Chang an University,Xi an 710054,Shaanxi,China;Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education,Chang an University,Xi an 710054,Shaanxi,China;Northwest Engineering Corporation Limited of Power China,Xi an 710065,Shaanxi,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《地球科学与环境学报》2018年第6期822-828,共7页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(41772365)

摘　　要：坝基岩体质量分级指标包括岩石质量指标(RQD,Q)、纵波波速(V)以及透水率(ω)等。他们相互之间存在一定关系,并随深度(h)的变化而变化。以青海玛沁地区玛尔挡水电站河床坝基6个钻孔的实测数据为基础,对上述指标随深度的变化规律及相互关系进行研究。结果表明:同一深度的岩石质量指标差异较大,但整体上随深度的增加呈线性带状增大,上、下限的线性关系分别为Q=0.488h+67.886与Q=0.309h+2.319;透水率与深度具有较好的相关性,随深度增大,透水率呈幂函数曲线下降趋势,即ω=1 329.192h-1.599;岩石质量指标、透水率和深度的拟合度较高;随着岩石质量指标的增加,纵波波速整体上呈线性带状增大的趋势,上、下限的线性关系分别为V=40.493Q+3 612.9和V=32.458Q+1 822.6,而透水率的几何平均值呈下降趋势,与岩石质量指标的算术平均值具有很好的相关性,即ω=6.378-3.708×10^(-7) Q^(3.832)。The quality classification indicators of dam foundation rock mass include the rock quality designation （RQD, Q ）, the velocity of the longitudinal wave （ V ）, the permeability （ ω ）, and so on. They have a certain relationship with each other and change with the depth （ h ）. Based on the measured data of 6 boreholes on the riverbed dam foundation of Ma erdang hydropower station in Maqin area of Qinghai, the variation of the above indices with depth and the relationships among them were studied. The results show that the RQD at the same depth is quite different, but increases in linear ribbon with the increase of depth as a whole, and the linear relationship for the upper and lower limits can be expressed by formulas Q =0.488 h ＋67.886 and Q =0.309 h ＋2.319, respectively; the permeability and depth have a good correlation, and the permeability decreases as a power function curve with the increase of depth, which is ω = 1 329.192 h -1.599 ; the degree of fitting among RQD, permeability and depth is higher; the velocity of the longitudinal wave increases in linear ribbon with the increase of RQD, and the linear relationships for the upper and lower limits are V =40.493 Q ＋3 612.9 and V =32.458 Q ＋1 822.6, while the geometric mean of permeability tends to decrease and has a good correlation with the arithmetic mean of RQD, which is ω =6.378-3.708×10 -7 Q 3.832 .

关 键 词：坝基岩体 质量分级 岩石质量指标 透水率 水电站 波速 深度 

分 类 号：P642[天文地球—工程地质学] TV221.2[天文地球—地质矿产勘探]