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不同反滤准则及其在宁南山区水库设计中的应用
杨佩瑶,王红雨,张 刚,何金沙
1.宁夏大学 土木与水利工程学院;2.旱区现代农业水资源高效利用教育部工程研究中心
摘要:
渗流作用是引起土石坝破坏的主要原因之一,合理设置反滤层能有效控制土体发生渗透破坏。为评价不同反滤准则在以黄土为筑坝材料的土坝中的效果,探讨黄土丘陵山区水利工程反滤系统适宜的设计准则,本文结合宁夏南部山区乔家沟水库土坝反滤系统设计案例,在反滤料级配曲线的上、下包线范围内平行选取4条不同的级配曲线,通过理论计算得出不同反滤准则所需的反滤料和被保护土料的特征粒径,对比分析了国内外7种反滤准则在该工程中的适用性。结果表明,当被保护土料为粉质黏性黄土时,我国现行碾压式土石坝设计规范(SL274—2001)反滤准则在该工程反滤料级配曲线的上下包线内适用范围大、效果好,能同时满足滤土与排水条件。研究结果可为宁夏南部黄土丘陵山区以及类似地区水库反滤系统的设计提供参考依据。
关键词:  反滤准则  反滤层  筑坝土料  级配曲线  黄土
DOI:
分类号:TV640.33
基金项目:宁夏回族自治区重点研发资助项目(2018BFH03010);国家自然科学基金项目(41962016)
Different filter design criteria and their applications to reservoir design in mountainous areas of southern Ningxia
YANG Peiyao1,2,3,2, WANG Hongyu1, ZHANG Gang1, HE Jinsha1
1.School of Civil and Hydraulic Engineering,Ningxia University;2.China;3.#$NL Engineering Research Center of Ministry of Education for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ningxia University
Abstract:
Seepage is one of the main causes of embankment dam failures, whereas the seepage failures in hydraulic structure can be prevented by reasonable installation of filter layers. For the purpose of evaluating the effectiveness of protective filters for the loess base soils by using different filter design criteria, and finding out an appropriate one for the hydraulic structures in the loess hilly mountainous area, this paper takes the embankment dam filter system of Qiaojiagou reservoir in the mountainous area of southern Ningxia as an example. Four different grading curves were choosing from those paralleled grading curves within the upper and lower envelope of the actual filter material grading curve, whereby the characteristic particle sizes of the these curves and base soil curves were calculated. Then seven filter design criteria were applied to these grading curves and their applicability to the project were analyzed. The results show that with respect to silty clayey loess acted as protected base soil, the current conducting Chinese filter design criteria code for rolled earth-rock fill dams (SL274—2001) has a broad application range and an excellent performance within the upper and lower envelope of the grading curve of filter material in Qiaojiagou reservoir project, meanwhile the filtering and draining conditions satisfied well. The results provide reference to the design of the filter system of reservoirs in the loess hilly mountainous areas of southern Ningxia and similar regions.
Key words:  filter design criteria  filter layer  filling material  grading curve  loess
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