美姑河坪头水电站深部白云岩岩溶砂化岩体质量分级  

Rock Mass Quality Classification and Deep Karst Sandification of Dolomite about Pingtou Hydroelectric Station at the Meigu River

作　　者：张海泉[1,2] 赵其华[1,2] 彭社琴[1,2] 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室成都理工大学 [2]成都理工大学环境与土木工程学院,成都610059

出　　处：《中国农村水利水电》2012年第7期151-155,共5页China Rural Water and Hydropower

基　　金：长江学者和创新团队发展计划资助(IRT0812);国家重点基础研究发展计划(2011CB013501)

摘　　要：美姑河坪头水电站深部发育白云岩岩溶砂化现象,地下硐室围岩岩体质量降低。以岩体完整程度、岩体结构特征、结构面状态的统计分析为基础,对白云岩岩溶砂化进行宏观分级及定性分析了岩溶砂化对岩体质量分级的影响。以引水隧洞为例,结合岩溶沙化区岩体结构特征对水电围岩岩体质量分级方法进行修正,提出以"岩溶砂化发育程度修正系数"为核心的围岩岩体质量分级模型。该模型评价结果与5号支洞、压力管道中平段施工支洞、蝶阀室交通洞、上室交通洞等现场施工实际揭示情况吻合度较高,适用性较好,可为地下硐室支护设计与施工提供基础依据。Karst sandification of dolomite appears in Pingtou Hydroelectric Station of Meigu River,underground rock mass quality reduction.Based on field data statistics and data analysis,this paper classifies karst sandification of dolomite macroscopically and analyzes qualitatively the influence on rock mass quality.By using diversion tunnel as an example and combining rock mass structure characteristics in the karst sandification areas,this paper introduces correction factors about the development degree of karst sandification and corrects the method of hydropower engineering geological classification of rock mass.The model evaluation results coincide with the actual construction site and can provide a basis for the design and construction of underground cavities.The applicability of correction model is very good.

关 键 词：白云岩 岩溶砂化 岩体质量 围岩分类 水电站 

分 类 号：TU457[建筑科学—岩土工程]