坝基破碎带岩体渗透特性试验研究  

Experimental study of seepage character of fractured belt in concrete gravity dam foundation

作　　者：唐军峰[1,2] 徐国元[3] 唐雪梅[1] 张凯[2] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]中国水电顾问集团中南勘测设计研究院,湖南长沙410014 [3]华南理工大学土木与交通学院,广东广州510641

出　　处：《湖南科技大学学报（自然科学版）》2010年第2期40-44,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金重大研究计划资助项目(50490272)

摘　　要：破碎带岩体在坝基分布范围广,厚度巨大,形态复杂,力学性质差,是重力坝抗滑稳定最不利的因素之一.为研究破碎带岩体的渗透特性,为坝基防渗设计提供依据,分析了岩体的微观结构,研究了高压压水条件下破碎带岩体的渗透性能.研究结果表明,破碎带岩体结构松散,晶体结构以粘土矿物为主,具有很强的亲水性;破碎带岩体经过不同程度的溶蚀,导致结构松散;破碎带为强透水性岩体;试验得到岩体的极限水力坡降为40,临界坡降为20左右.综合分析表明,破碎带岩体具有较高的透水性,是坝基防渗处理的重点.Fractured belt are widely distributed in concrete gravity dam foundation,with its wide thickness,complicated shape and weak engineering mechanical properties,which make up of one of the most unfavorable factors which influent on the stability against concrete gravity dam sliding.In order to analysis the seepage character and provideguidance to the design of antisepses,micro structural test with high pressure water-pressure test was carried out.The results indicate that the fractured belt rock mass has loose structure,composed with clay mineral,and has strong hydrophilic nature.Since experience erosion at some extent,the fractured belt rock mass has unconsolidated structure.Results also indicate that the fractured belts are high pervious rock mass,with ultimate hydraulic slope 40 and critical one is about 20.Synthetic analysis indicates that the fractured belt rock mass has good hydraulic permeability,which is one of the major problem concentrated on.

关 键 词：破碎带 岩体微观测试 渗透特性 高压压水试验 

分 类 号：TU452[建筑科学—岩土工程]