摘要
西南某水电站坝区地质史上构造-热液活动复杂,岩体绿泥石化程度较高。经调查研究表明,坝区岩体绿泥石化蚀变既有热液成因,又有构造动力成因,其分布受岩性、构造、应力集中和浅表风化作用影响,在辉绿岩脉中蚀变强度最高,花岗岩中蚀变最强处往往远离断层分布,整体上由地表及深部,蚀变变弱。受蚀变影响,岩体总体性状变差,表现为变形模量偏低,结构面性状恶化。文章初步讨论了绿泥石化蚀变可能引起的主要工程地质问题及其工程对策。
The tectonic-hydrothermal activity is complex in the geologic history, and the grade of rock mass chloritized alteration is comparatively higher at a hydropower station dam site in Southwest China. The study revealed that the chloritized alteration is caused by both the hydrotherrnal activity and tectonic dynamic, and its distribution is controlled by lithology, tectonics, stress concentration and weathering. Therefore the chloritized alteration intensity. But in granite, the highest intensity is often far from the faults. As a whole, with of dolerite-dyke the embedding＇ is the highest shoaling, the rock mass chloritized alteration is more and more stronger. Affected by alteration, the whole properties of the rock mass become worse, such as the low deformation modulus and the deterioration of the structure surface＇ s properties. This article preliminarily discusses on the main engineering geological problems caused by rock mass chloritized alteration and correlated engineering countermeasures.
出处
《中国地质灾害与防治学报》
CSCD
2007年第1期68-72,共5页
The Chinese Journal of Geological Hazard and Control
关键词
岩体绿泥石化蚀变
变形模量
辉绿岩脉
花岗岩
chloritized alteration of rock mass
deformation modulus
dolerite-dyke
granite
