工程地质学报2016，Vol.24Issue(5)：788-797,10.DOI:10.13544/j.cnki.jeg.2016.05.008
长江某水电站坝基剪切带发育规律与抗滑稳定研究
DEVELOPMENT MECHANISM OF SHEAR ZONES AND STABILITY OF DAM FOUNDATION OF A HYDROPOWER STATION LOCATED IN YANGTZE RIVER
摘要
Abstract
Shear zone has direct influence on stability of dam foundation,which is an important engineering geological issue,and is very common in the construction of hydroelectric project.Studying the engineering geological characteristics especially development and distribution characteristics of shear zones has significant and positive influence on the process of construction.In this paper,the sedimentary environment and facies in the dam area are investigated by the result of lithology,mineral composition,mineral formation,grain size parameters, sedimentary structure and so on.Development mechanism and distribution characteristics of shear zone then are studied based on the regional geological structure and the results of palaeosedimentary environment and sedimentary microfacies of protosomatic weak intercalation.Taking the distribution characteristics of shear zones into account, stability of dam foundation further is analyzed and evaluated.The results display that development and distribution of shear zones are determined by sedimentary environment and facies.It arises at the top of hemicyclothem frequently.Due to the multiple lithofacies,uncontinuity of spatial distribution of shear zones is very common.The types of the same shear zone in different position are also various.In addition,XRD and XRF results show that shear zones are highly dispersed system which is composed of various clay minerals,which demonstrates different engineering geological characteristics and strength parameters.Furthermore,FLAC3D states that the uncontinuity of spatial distribution and behaviors of shear zones have great influence on the stability of dam foundation,concerning to the project duration and cost directly.Consequently,studying the shear zones from the perspective of sedimentary environment and facies is available to have a clear understanding about development and distribution characteristics of shear zones,having significant influence on the evaluation of engineering geological condition and stability analysis of dam foundation.关键词
沉积环境/沉积相/剪切带/空间分布特征/抗滑稳定Key words
Sedimentary environment/Sedimentary facies/Shear zone/Spatial distribution/Stability analysis分类
天文与地球科学引用本文复制引用
项伟,柳景华,贾海梁,黄伟..长江某水电站坝基剪切带发育规律与抗滑稳定研究[J].工程地质学报,2016,24(5):788-797,10.基金项目
长江三峡勘测设计院有限公司委托专题研究项目资助． （）
