贵州都匀地区黑色岩层边坡风化破坏机理研究  

Black rock slope weathering mechanism of in Duyun of Guizhou province

作　　者：李晓宁[1,2] 朱宝龙[1] 廖昕[2] 李季伟[2] 凌斯祥[2] 巫锡勇 

机构地区：[1]西南科技大学土木与建筑工程学院,四川绵阳621010 [2]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《浙江工业大学学报》2013年第3期309-313,共5页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金面上项目(41172261);四川省科技支撑计划项目(2012SZ0051)

摘　　要：黑色岩层是具有特殊矿物(黄铁矿)的一套岩石,其风化破坏造成岩体整体结构强度降低,在黑色岩层分布地区,极易使边坡失稳.通过对贵州都匀地区黑色岩层的野外调查、岩样XRD衍射分析、水质调查,认为黑色岩层中含有硫化矿物,易被氧化形成酸性水,从而溶解、溶蚀矿物,扩大溶蚀腔,并使元素流失迁移,生成具有膨胀性的粘土矿物,最终导致岩体物理力学性质降低而发生风化性破坏;黑色岩层边坡中节理裂隙发育并具有富氧水作用下,酸性水沿节理裂隙拓宽岩体结构面,造成其结构空间损伤,从而形成岩体边坡风化破坏的发生;认为黑色岩层边坡风化破坏主要以岩石矿物蚀变作用、节理裂隙溶蚀扩张作用的方式.In the black rock distribution area, since black rock with special mineral （pyrite） component, black rock slope often fails to be stable due to weathering, harm engineering construction and human activities. In the black rock of Duyun, sample XRD diffraction analysis, and water quality investigation, gave that the black rock contain sulfide minerals, easy to be oxidized to form acid water. So dissolve mineral, enlarge the dissolution cavity, lose element migration, form clay mineral. Black rock slope joint fracture and rich oxygen under the action, acid water along the joint fissure broaden the rock mass structure surface. Black rock slope weathering failure occurred mainly in the way that mineral rock alteration function, joint crack corrosion expansion action.

关 键 词：黑色岩层 边坡 风化 酸性水 

分 类 号：P642.24[天文地球—工程地质学]