张延亿,贾伟,樊恒辉,邓刚,陈含,张茵琪

• 1:中国水利水电科学研究院流域水循环模拟与调控国家重点试验室
• 2:中国水利水电科学研究院水利部水工程建设与安全重点实验室
• 3:西北农林科技大学水利与建筑工程学院

摘要(Abstract)：

堆石料遇水后产生的湿化变形对堆石坝的安全运行造成一定影响，但目前对降雨作用引起的堆石料非饱和湿化变形的认识还不够充分。以某工程软岩堆石料为研究对象，开展不同竖向应力条件下的降雨湿化变形试验，分析材料湿化变形基本规律及竖向应力对材料湿化变形的影响。结果表明：不同竖向应力条件下材料湿化变形发展规律相似，其湿化应变增长经历了快速、缓慢及稳定三个阶段，各阶段湿化变形量值、发展速率及稳定时间有所差异；竖向应力对初次降雨时材料湿化变形的影响十分显著，随着竖向应力的增大，湿化应变时程曲线呈完全不同的发展趋势。同时，分析了竖向应力对多次降雨循环下材料湿化变形的影响，发现低竖向应力时材料颗粒滑移、位置重排引起了大部分湿化变形，其应变增加幅值小；竖向应力较高时，颗粒破碎等加剧了湿化变形的发展，应变大幅增加；随着竖向应力的进一步增大，颗粒破碎率降低，试样密实度提高，颗粒间咬合约束作用凸显，湿化变形增幅减小。

关键词(KeyWords)： 湿化变形;非饱和入渗;竖向应力;堆石料

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2018YFC1508502);; 中国水科院基本科研业务费项目(GE145B023021)

作者(Author): 张延亿,贾伟,樊恒辉,邓刚,陈含,张茵琪

DOI: 10.13928/j.cnki.wrahe.2022.02.008

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