三峡船闸高边坡工程地质勘察与研究综述

三峡双线五级船闸高边坡稳定至关重要。初步设计阶段共进行了4条线路比较的勘察与研究工作，并在此基础上布置了20条勘探横剖面，每条剖面5个钻孔，布置了长600多m的勘探平洞，作为初设补充勘探。初步设计阶段基本确定了边坡的开挖坡比。技术设计阶段主要勘察工作量有：1：10：0：0工程地质测绘，坑槽探，勘探剖面20条，钻孔216个，400m平洞和各类试验。通过上述工作，查明了船闸区岩性、构造分布及结构面特征、岩体风化分带及厚度、岩体水文地质结构及渗透性，提供了岩体结构分类、应力及地震动参数、岩体物理力学建议指标，对高边坡稳定性进行了分析，提出了有关边界条件及参数的建议，基本满足了设计要求。

Overview of geological exploration & study on high slope at Three Gorges shiplock

It was vital important to ascertain the engineering geology for the stability of the Three Gorges shiplock. On the basin of comparative results of the exploration and study on the four lines conducted during the preliminary design phase of the Three Gorges project, 20 exploratory sections with 5 drill holes each and more than 600 m long exploratory adits were arranged as supplementary exploration. The excavation slope magnitudes were fixed at the phase of the preliminary design. The major exploratory work at the phase of technical design included 1:1000 scale engineering geological mapping, pit and trench exploration, 20 exploratory sections, 216 drill holes, 400 m long adits and other various tests. Through the above-mentioned efforts, the lithologic features, structural distribution and tectonic plane characteristic, distribution and thickness of weathered zones, and hydrogeological structures and permeability of rock mass were found out, dealing with classification of rock structures, dynamic parameters of stress and earthquake, proposed physico-mechanical indexes, analysis of high slope stability and suggestions associated with boundary conditions and their parameters, which could basically meet the design requirements.