鄂西清江中游半峡背斜变形结构及其工程意义

THE DEFORMATIONAL TEXTURE OF THE BANXIA ANTICLNE AND ITS BEARING ON ENGINEERING GEOLOGY OF MIDDLE QINGJIANG RIVER IN WESTERN HUBEI

本文在概要介绍湖北西部清江中游大型水利枢纽水布垭、半峡两比选坝址场区地质背景的基础上,从几何要素、层间褶皱、轴面劈理和派生断层等方面解析半峡背斜的变形结构特征,进而探讨半峡背斜形成发展过程及其对两坝址工程地质条件的影响。为两坝址工程地质条件对比分析开拓新思路。

After a brief description of the geological settings of the two dam sites located re- spectively in Shuibuya and Banxia in the middle reaches of the Qingjiang river of westen Hubei province'an analysis of the deformational textures of the Banxia anticline was made in terms of its characteristic geometry,intraformational fold,axial plane cleavage and sec- ondary fault.The texture was formed and developed in the major phase of Yanshanian move- ment.The major engineering geological conditions of these two dam sites sitting on opposite limbs of the anticline are controlled by its deformational texture.