那位水库坝址区工程地质条件及评价

Engineering geological conditions and evaluation of Nawei Reservoir dam site

拟建的那位水库拦河坝为混凝土重力坝,坝顶高程654 m,最大坝高81 m,坝顶长208 m,坝址区两岸地形陡峭,主要出露地层为三叠系中统板纳组中段(T2b2)中厚~厚层状泥质砂岩夹灰色薄层状、条带状粉砂质泥岩,岩层产状平缓、节理裂隙发育、边坡稳定问题突出、地质条件复杂。本文针对坝址区工程地质特点,采取多种勘探方法和手段,针对性地查明了影响工程稳定性的关键因素,为设计提供了合理的处理措施和地质建议。

Nawei Reservoir to be constructed is designed with a concrete gravity dam with a crest elevation of 654m,a maximum dam height of 81m and a crest length of 208m.At the dam site,the terrain on both banks is steep;the main exposed strata are the medium~thick layered argillaceous sandstone interbedded with gray thin layered and banded silty mudstone of the Middle Banna Formation(Tab°)in the Middle Triassic System;the strata occurrence is gentle;the joint fissure is developed;the slope stability problem is prominent;the geological condition is complex.According to the engineering geological characteristics of the dam site,a variety of exploration methods and means were adopted to identify the key factors affecting the engineering stability,so as to provide reasonable treatment measures and geological suggestions for the design.