西北水电Issue(1)：78-86,9.DOI:10.3969/j.issn.1006-2610.2025.01.010
砂泥岩互层坝基渗漏问题及处理措施研究
Study on the Seepage Problem of the Dam Foundation in Sandstone-mudstone Interbedded Strata and the Treatment Measures
摘要
Abstract
The formation seepage structure in the sandstone-mudstone interbedded area has obvious anisotropic characteristics,which poses a severe challenge to the seepage safety of the dam foundation of the dam built on it.In order to study the seepage causes of the dam built in the sandstone-mudstone interbedded area and the distribution law of the seepage field of the dam foundation,based on the analysis of the geological characteristics of the sandstone-mudstone interbedded strata and the summary of the seepage structure of the sandstone-mudstone interbedded geology,a data statistical method is used to analyze the seepage causes of the existing dams in the sandstone-mudstone area,and corresponding suggestions for the seepage control measures for dam construction in the sandstone-mud-stone interbedded area are put forward.Taking the Puhua Project on the sandstone-mudstone interbedded foundation as an engineering example,a continuous medium seepage finite element analysis method is adopted to establish a three-dimensional seepage calculation model,and the distribution law of the seepage field of the dam foundation of the dam in the sandstone-mudstone interbedded area is analyzed.The results show that the geological structure in the sandstone-mudstone interbedded area is complex,and its seepage char-acteristics are obviously anisotropic.X-shaped high-angle tension fractures are often developed between the interbedded sandstone and mudstone,and the reservoir water usually generates seepage channels along the bedding joint surface of the sandstone and mudstone.Fractures are the main cause of the seepage of the dam foundation in the sandstone-mudstone interbedded area,and the dam seepage caused by fractures accounts for about 60%of the total seepage.The seepage volume of the dam shows an increasing trend with the increase of the dam height and the length of the dam crest,and there is an obvious correlation between the seepage volume and the dam height and the dam length.The seepage anisotropy of the sandstone-mudstone interbedded geology brings greater seepage risks to the dam body and the dam foundation.The formation anisotropy will increase the seepage volume and the hydraulic gradient of the rock mass in the project area,which is not conducive to the seepage stability of the mountain.关键词
砂泥岩互层/渗流/防渗措施/坝基渗漏Key words
Sandstone-mudstone Interbedded Strata/Seepage/Seepage Control Measures/Seepage of Dam Foundation分类
水利科学引用本文复制引用
温立峰,王民侠,张晨..砂泥岩互层坝基渗漏问题及处理措施研究[J].西北水电,2025,(1):78-86,9.基金项目
国家自然科学基金项目(U2443230,52479132) （U2443230,52479132）
