永泰抽蓄下水库边坡岩体差异风化勘察及研究

Investigation and Research on Differential Weathering of Rock Mass in Slope of Yongtai Reservoir

永泰抽水蓄能电站工程区出露的地层岩性主要为晚侏罗系上统南园组的晶屑凝灰熔岩及燕山晚期侵入的花岗斑岩,因所在地区下水库(坝)区地形地貌较复杂,地质构造较发育,并且该地区岩体有其特有的工程地质特性,故其风化土的工程地质条件也较复杂。主要阐述了下库大坝及库岸边坡不同工程部位岩体风化特征,并对岩体风化差异性进行分析,总结出岩体差异风化的一般分布规律,以便及早预判岩体风化深度,为工程施工提供地质依据。

The lithology of strata exposed in the engineering area of Yongtai Pumped Storage Power Plant is mainly crystalline tuff lava of Nanyuan Formation of Upper Jurassic System and granite porphyry intruded in late Yanshan Period.The lower reservoir area in this area has complicated topography and landform,well developed geological structure,and the rock mass in this area has its own engineering geological characteristics,so the engineering geological conditions of weathered soil are complicated.This paper mainly elaborates rock mass weathering characteristics of different engineering parts of lower reservoir dam and reservoir bank slope,analyses rock mass weathering differences and summarizes general distribution law of rock mass differential weathering,so as to pre-judge rock mass weathering depth as early as possible and provide geological basis for engineering construction.