唐瑶 熊灿娟 陈丽 犹茜 董柏材

摘 要：为准确评价某水库的工程地质条件，本文综合该水库现场踏勘、钻孔以及平硐等勘察资料及室内试验成果，对坝址区主要地质条件进行详细论证及评价。结果表明，该水库坝基工程地质条件较好，两岸山体较宽厚，库岸稳定，河流河床及岸坡覆盖层不厚，岩体风化不深，弱风化下部岩体作为大坝基础持力层可满足设计荷载要求。左右两岸T1yn1属弱岩溶地块，坝址区为强可溶岩，因此形成管道型及裂隙渗漏的可能性均较大，需要进行坝基和两岸防渗处理。

关键词：水库坝址区;工程地质条件;地形地貌;地层岩性

中图分类号：TV221.2文献标识码：A文章编号：1003-5168（2020）19-0067-03

Abstract： In order to accurately evaluate the engineering geological conditions of a certain reservoir， the main geological conditions of the dam site were demonstrated and evaluated in detail based on the field survey， drilling and adit survey data and laboratory test results. The results show that the engineering geological conditions of the dam foundation of the reservoir are good， the mountains on both banks are relatively wide and thick， the reservoir bank is stable， the overburden layer of river bed and bank slope is not thick， the rock mass weathering is not deep， and the rock mass under the weak weathering can meet the design load requirements. T1yn1 on the left and right banks belongs to weak karst block， and the dam site area is strongly soluble rock. Therefore， it is possible to form pipeline type and crack leakage， so it is necessary to carry out anti-seepage treatment for dam foundation and both banks.

Keywords： reservoir dam site area;engineering geological conditions;topography;lithology

某水库位于贵州省盘县淤泥乡与鸡场坪乡之间，处于乌都河左岸一级支流乌图河上游，坝址区距县政府所在地红果镇约66 km。该水库的主要任务是为贵州省盘县“煤（焦、化）-钢-电”一体化循环经济工业生产及生活提供用水，并兼有农田灌溉、防洪。为了对该水库坝址工程地质条件作出合理评价，本文结合该坝址的地形地貌、地层岩性、地质构造及岩溶水文条件等勘察资料，对地基承载力、抗滑稳定性和绕坝渗漏问题进行分析评价，论证建坝适宜性，并为后续的设计提供可靠的地质资料。

1 坝址工程地质条件

1.1 地形地貌

该水库坝址地处峡谷地带，河谷为基本对称的“V”型橫向狭窄谷，左右岸均为斜向坡，基岩裸露，河床宽约为13 m，河床高程为1 656.5 m，左岸坡度角为43°～66°，右岸坡度角约为54°。……