特高堆石坝砾石土心墙非均质缺陷对渗流场影响分析  

Analysis of the Influence of the Gravel Soil Core Wall Inhomogeneous Defects on the Seepage Field of the Super-high Rockfill Dam

作　　者：卢斌[1,2] 郑雪玉 吴修锋 谢兴华[1] 李艳伟[4] 王照英 LU Bin;ZHENG Xueyu;WU Xiufeng;XIE Xinghua;LIYanwei;WANG Zhaoying(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Research Center on Levee Safety&Disaster Prevention,Ministry of Water Resources,Zhengzhou 450003,China;Hydrochina Guiyang Engineering Corporation,Guiyang 550081,China;Huaneng Lancang River Hydropower INC,Kunming 650214,China)

机构地区：[1]水文水资源与水利工程科学国家重点实验室,南京水利科学研究院,江苏省南京市210029 [2]水利部堤防安全与病害防治工程技术研究中心,河南省郑州市450003 [3]中国电建集团贵阳勘测设计研究院有限公司,贵州省贵阳市550081 [4]华能澜沧江水电股份有限公司,云南省昆明市650214

出　　处：《水电与抽水蓄能》2023年第3期22-25,39,共5页Hydropower and Pumped Storage

基　　金：国家重点研发计划资助(2021YFC3090105);水利部堤防安全与病害防治工程技术研究中心开放课题基金资助项目(LSDP202203)。

摘　　要：砾石土心墙是特高心墙堆石坝防渗系统的关键组成部分,受土料物理特性以及掺料、碾压等施工过程中不确定性因素的影响,心墙砾石土渗透系数表现出一定的非均质性和随机性,对特高堆石坝渗流稳定安全造成重要影响。本文利用分形数学方法刻画出特高堆石坝心墙碾压分层结构及非均质缺陷,三维渗流模拟结果显示,存在非均质缺陷条件下心墙内水位等势线出现抬升,心墙下游面渗透坡降局部发生突变,最大渗透坡降超过允许值,增加下游面渗透破坏风险。砾石土心墙碾压施工过程中应减少欠碾或过碾等质量缺陷,严格控制压实质量。Gravel soil core wall is the key component of the antiseepage system of super-high core rockfill dam,due to the influence of physical properties and uncertain factors in the process of mixing and rolling,the permeability coefficient of gravelly soil core wall shows heterogeneity and randomness,which has an important impact on the seepage safety of super-high rockfill dam.In this paper,fractal mathematical method is used to describe the layered structure and inhomogeneous defects of the core wall of super-high rockfill dam,The 3D seepage simulation results shown that under the condition of heterogeneous defects,the water level in the core wall risen,the seepage gradient of the downstream face of the core wall changed abruptly,and the maximum seepage gradient exceed the allowable value,which increased the risk of seepage damage of the downstream face.The quality defects such as less-rolling or more-rolling should be reduced and the rolling quality should be strictly controlled during the construction of gravel soil core wall.

关 键 词：特高心墙堆石坝 砾石土心墙 非均质性 分形 渗流场 

分 类 号：TV641.41[水利工程—水利水电工程]