瀑布沟水电站砾石土心墙初次蓄水期原位钻孔渗流试验研究  

In-situ drilling tests of seepage in gravel soil core wall during the first impoundment in Pubugou hydropower station

作　　者：胡万雨[1] 陈向浩[2] 林江[1] 况磊强[3] 

机构地区：[1]四川大学水利水电学院,成都610065 [2]中铁第四勘察设计院,武汉430063 [3]四川省水利水电勘测设计研究院,成都610072

出　　处：《岩土力学》2013年第5期1259-1263,1273,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51079093)

摘　　要：目前,通常采用原型监测的方法了解土石坝运行期渗流情况,但对稳定期渗流研究较多,而未有在土石坝初次蓄水期原位钻孔渗流试验相关研究。瀑布沟水电站大坝由于788.00 m高程以上心墙较薄且早期未布置监测仪器,前期监测显示大坝可能存在抗渗薄弱区域,在初次蓄水期于心墙0+131及0+434断面进行了原位钻孔渗流试验。通过对试验成果分析并与监测成果相比较,得出大坝心墙0+131、0+434断面部分高程存在渗透薄弱带。试验结果表明,通过精心组织设计施工,进行蓄水期心墙原位钻孔渗流试验是可行且有意义的。建议对反滤层保护下的裂缝土体抗渗强度进行评价,加强心墙防渗安全监测以及时掌握心墙运行状况。其试验研究可以为其他砾石土心墙坝的设计、施工、运行期的安全提供参考。At present the prototype monitoring is commonly used to know the seepage in performance period in earth-rock dam. Much research to stable seepage and there is no report about in-situ drilling tests of seepage during the first impoundment. In Pubugou hydropower station, the core-wall is such thin and not decorated with any monitoring instruments at early time above the elevation of 788.00 m. Weak areas of anti-permeability are revealed probably by the earlier monitoring, in-situ drilling tests of seepage is carried out in the core-wall during the first impoundment at 0＋131and 0＋434 section in August 2010. The results of the test analysis shows that, weak penetration area exists at some elevation of section 0＋131and section 0＋434 in the core-wall of Pubugou hydropower station. It also shows that under the necessary condition, in situ drilling tests in the core-wall during the first impoundment is practical and meaningful. The anti-permeability of fissured soil under the protection of reversed filter is suggested to be evaluated, the seepage monitoring in core-wall should be strengthened to inspect the safety of the core-wall. The experiment researches provide a reference for other gravel soil core wall of the dam design, construction, and the safety of the operation period.

关 键 词：土石坝 渗透试验 心墙 初次蓄水期 

分 类 号：TU413[建筑科学—岩土工程]