摘要
结合自一里水电工程气垫式调压室设计厂房区岩体渗透性研究,提出了从定性分析到定量计算与评价,系统刻画岩体渗透性与分区评价,以满足气垫式调压室设计要求的实用方法.该方法以基础地质与水文地质研究为背景,从系统全面的裂隙测量与统计分析中,获取岩体裂隙空间发育规律和裂隙方向、隙宽、迹长、间距和裂隙率等统计特征值,运用裂隙岩体渗透张量理论,得出分布式岩体渗透主值和综合渗透系数;在此基础上,进行岩体渗透性分区与评价.评价得出:花岗岩夹变质砂岩透镜体的厂区岩体渗透性总体随深度变化,受接触带影响局部渗透性呈强弱交替变化;区内裂隙岩体的渗透性分3级,近地表浅层岩体渗透性较强,综合渗透系数为n×100m/d～n×10-1m/d,调压室区为中等～弱渗透性岩体,渗透系数为n×10-2m/d～n×10-4m/d.
Ziyili Hydropower Station in Sichuan Province uses an equalized room fitted with atmoseal, which needs a more precise investigation on the permeability of rock masses around the power house. This paper proposes an effective method that systematically characterizes the permeability of rock masses, from qualitative analyses to quantitative analyses. Based on a study of basic geology and hydrogeology conditions, we measured the geometric parameters of fractures （such as orientation, aperture, trace length, space and fracture frequency） and obtained their characteristic statistical values. We then calculated the main value and comprehensive value of the permeability tensor using permeability tensor theory, and finally divided the rock masses around the power house into a few permeability subareas. The general permeability of the rock masses around the power house varies with depth and the local permeability varies alternately between the higher and the lower due to the effect of the contact strip. The permeability can be divided into three grades. The permeability of rock masses near the surface is higher （n×10^0m/d～n×10^-1m/d） and permeability of rock masses around the equalized room with atmoseal is moderate to lower （n×10^-2 m/d～n×10^-4 m/d）.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2006年第3期417-422,共6页
Earth Science-Journal of China University of Geosciences
基金
国家电力公司成都勘测设计院研究课题"自一里水电站厂址区水文地质条件及气垫式调压室区岩体渗透性研究"(zyl200203).
关键词
水电站
裂隙岩体
统计特征值
渗透性评价.
hydropower station
rock masses
characteristic statistical values
permeability evaluation
atmoseal.
