黏土化蚀变岩与断层泥质物的工程性质对比研究——以孟底沟水电站工程为例  

Comparative study on engineering characteristics of clay altered- rock and fault argillaceous materials of Mengdigou Hydropower Station

作　　者：魏伟[1] 沈军辉[1] 祝华平[2] 苗朝[1] 刘海[1,3] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [3]安徽省公益性地质调查管理中心,安徽合肥230001

出　　处：《人民长江》2015年第13期29-32,共4页Yangtze River

摘　　要：通过对黏土化蚀变岩和断层泥质物X射线粉晶衍射、颗分、水理性及抗剪(断)强度等的试验研究,对比分析了黏土化蚀变岩与断层泥质物的工程地质特性。试验结果表明:黏土化蚀变岩中主要含有伊利石、高岭石、蒙脱石等黏土矿物和石英等,其次为碳酸盐和长石等,其矿物组成、成分与断层泥质物具有相似的特征;颗分及水理性试验显示,黏土化蚀变岩与断层泥质物都以黏土质砾为主,少许为黏土质砂,且二者具有相同的抗剪(断)强度;黏土化蚀变岩按结构面性状可划分为岩屑夹泥型。该研究为划分黏土化蚀变岩的工程性状、评价其可利用性等提供了可靠的依据。Through experimental researches of X - ray powder diffraction, grain - size analysis, water physical property and shear strength for clay altered - rock and fault argillaceous materials, their engineering geological characteristics are compared and analyzed. The results show that clay altered - rock mainly contains illite, kaolinite, montmorillonite clay mineral and quartz ete, followed by carbonate and feldspar, so their mineral composition, components are similar with fault argillaceous materials. The tests of grain - size and water physical property show that the clay altered - rock and fault argillaceous materials are dominated by gravelly clay, and the minority is clay sand, both of which have the same shear strength. Clay altered - rock can be classified as cuttings mud from the aspect of structural surface character. The research provides a favorable basis for evaluation of availability of clay altered - rock and classification of engineering properties.

关 键 词：黏土化蚀变岩 断层泥质物 矿物学特征 物理力学特征 

分 类 号：P642[天文地球—工程地质学]