存在高渗透区的黏土心墙土石坝渗流稳定性分析

doi:10.13243/j.cnki.slxb.20200202

科研成果详情

题名	存在高渗透区的黏土心墙土石坝渗流稳定性分析
其他题名	Seepage stability analysis of earth and rockfill dam with clay core by considering high permeability zones
作者	彭铭 1; 毕竞超 1; 朱艳 1,2; 方坑龙3; 李冰心 4; 徐佳成 5
发表日期	2020
发表期刊	水利学报影响因子和分区
语种	中文
原始文献类型	学术期刊
关键词	土石坝高渗透区孔隙水压力黏土心墙渗流稳定性
摘要	黏土心墙土石坝是重要的挡水建筑物,心墙的低渗透性可以大幅降低坝体水力梯度,减少坝体发生渗透破坏的风险。然而心墙的质量问题(如局部高渗透区)会影响坝体的渗透稳定性,甚至酿成管涌溃坝等严重后果。以瀑布沟心墙土石坝为原型开展坝体渗流大型水槽模型试验,并结合有限元数值模拟方法研究高渗透区对坝体内部渗流场和渗流稳定性的影响。试验表明高渗透区域将改变心墙的渗流场,成为优势渗流通道,导致高渗透区域附近孔压值大幅上升,同时高渗透区域的存在将显著提升坝体渗漏速率。试验与模拟结果一致表明,随着高渗透区域逐步上移,高渗透区所在位置处的孔隙水压力增大,坝体渗漏量减小。高渗透区和心墙的渗透系数增加都会使心墙孔压值和渗漏量增加;随着高渗透区的渗透系数的增大,心墙坝渗流稳定性系数降低,导致坝体稳定性下降;随着心墙渗透系数的增大,高渗透区水力梯度略微减小,但心墙整体临界水力梯度下降,坝体稳定性降低。所得结论可为基于监测数据反演分析心墙的质量问题和评估坝体的安全性能提供依据。
其他摘要	Rockfill dams with clay core are important water-retaining structures. The low permeability of the core wall can highly reduce the hydraulic gradient of the rest dam body and the risks of seepage failure to the dam body. However, the quality of the core wall (such as local high-permeability zones, ) will affect the seepage stability of the dam body, which may lead to serious consequences such as piping failure. In this paper, large-scale water flume tests of seepage stability is performed with the prototype of the Pubugou soil and rockfill dam. A numerical model of finite element which was validated with the test results was used to study the influence of the high-permeability zone (HPZ) on the seepage field and stability of the model dam. The test shows that the HPZ will change the seepage field of the clay core and become a dominant seepage channel,and meanwhile, the existence of high permeability area will significantly increase the seepage rate of the dam body. The test and simulation results both show that the pore water pressure of the upper part of the clay core increased with the rising of the HPZ position; while the leakage volume of the dam decreased at the same time because of lower water pressure of the HPZ. With the increase of the permeability of the clay core and the HPZ, the pore water pressure of clay core and the leakage rate both increased. The seepage stability of the dam would be reduced with the increase of the permeability of the HPZ and the water level. Although the increase of the permeability of the clay core will leading to decrease of the hydraulic gradient in the HPZ, the increase of the hydraulic gradient in the clay core would lead to decrease of the seepage stability of the clay core. The results obtained in the paper offer basis on the back analysis of the clay wall quality and the assessment of the safety and performance of the dams.
资助项目	国家自然科学基金项目（41877234,41731283）;国家重点基础研究发展计划项目（973计划）（2013CB036404）;同济大学土木工程高峰学科-交叉学科项目;同济大学中央高校基本科研业务费专项资金项目;2019年湖南省水利科技项目
ISSN	0559-9350
卷号	51 期号:11 页码:1347-1359
DOI	10.13243/j.cnki.slxb.20200202
页数	13
收录类别	CNKI ; SCOPUS ; 万方 ; 维普 ; 北大核心 ; PKU ; EI ; ISTIC ; CSCD
学科领域	水利工程
URL	查看原文
CSCD记录号	CSCD:6854431
SCOPUSEID	2-s2.0-85099180045
CNKI分类号	TV641.25 ; TV223.4
万方分类号	TV641.4(水利枢纽、水工建筑物)
引用统计
文献类型	期刊论文
条目标识符	https://kms.wmu.edu.cn/handle/3ETUA0LF/54294
专题	基建处
作者单位	1.同济大学地下建筑与工程系; 2.中船第九设计研究院工程有限公司; 3.温州医科大学基建处; 4.中南置地有限公司; 5.中国国际工程咨询公司
推荐引用方式 GB/T 7714	彭铭,毕竞超,朱艳,等. 存在高渗透区的黏土心墙土石坝渗流稳定性分析[J]. 水利学报,2020,51(11):1347-1359.
APA	彭铭, 毕竞超, 朱艳, 方坑龙, 李冰心, & 徐佳成. (2020). 存在高渗透区的黏土心墙土石坝渗流稳定性分析. 水利学报, 51(11), 1347-1359.
MLA	彭铭,et al."存在高渗透区的黏土心墙土石坝渗流稳定性分析".水利学报 51.11(2020):1347-1359.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
SLXB202011005.caj（3124KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览下载