摘要
花岗岩具有高致密性、高强度及低渗透性等特点,常作为高放射性废物处置地、抽水蓄能电站等重大工程的优良选址。因此,研究花岗岩相关工程特性具有重要意义。选取河南信阳五岳水库上库区两处钻孔岩芯作为样品,开展薄片鉴定和渗透测试,分析不同风化程度花岗岩矿物组成和渗透特性的变化规律;通过对比分析不同风化程度岩芯样品的各组分含量与渗透系数变化情况,研究二者之间的关系。结果表明:在研究区内,花岗岩随着风化程度的加深,钾长石、斜长石相对含量逐渐减少,黑云母含量迅速减少,白云母含量逐步增长,石英含量较为稳定;花岗岩渗透系数受风化作用影响明显,微风化花岗岩渗透系数处于10^(-6) cm/s量级,弱风化花岗岩渗透系数处于10^(-5) cm/s量级,强风化花岗岩渗透系数处于10^(-4) cm/s量级;钾长石、斜长石和云母含量与渗透系数具有一定的负相关性。该研究成果对于花岗岩地区的重大工程选址具有重要的参考价值。
Granite has the characteristics of high compactness,high strength and low permeability.It is often used as an excellent site for major projects such as high-level radioactive waste disposal sites and pumped storage power stations.Therefore,it is of great significance to study the engineering characteristics of granite.The rock cores of two boreholes in the upper reservoir area of Wuyue reservoir in Xinyang,Henan Province are selected as samples to carry out thin section identification and permeability test,and the variation laws of mineral composition and permeability characteristics of granite with different weathering degrees are analyzed.The relationship between the content of each component and permeability coefficient of core samples with different weathering degrees is studied.The results are as follows.In the study area,with the deepening of weathering degree of granite,the relative content of potash feldspar and plagioclase gradually decreases,the content of biotite rapidly decreases,the content of Muscovite gradually increases,and the content of quartz is relatively stable.The permeability coefficient of granite is obviously affected by weathering.The permeability coefficient of slightly weathered granite is about 10^(-6) cm/s,the permeability coefficient of weakly weathered granite is about 10^(-5) cm/s,and the permeability coefficient of strongly weathered granite is about 10^(-4) cm/s.The contents of potassium feldspar,plagioclase and mica are negatively correlated with the permeability coefficient.
作者
张翼宇
黄志全
赵菲
袁广祥
王洪建
冉涛
ZHANG Yiyu;HUANG Zhiquan;ZHAO Fei;YUAN Guangxiang;WANG Hongjian;RAN Tao(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2022年第1期103-108,共6页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金项目(41807254,51704120)
中原科技创新领军人才计划项目(214200510030)
河南省青年人才托举工程项目(2021HYTP013)
河南省重点研发与推广专项(212102310374)
河南省高等学校重点科研项目(20A410001)。
关键词
花岗岩
风化程度
矿物组成
渗透系数
相关性
granite
weathering degree
mineral composition
permeability coefficient
correlation
