考虑降雨及开挖影响下的厚覆盖层边坡渗流特征及稳定性-中南大学学报.PDFVIP

第 47 卷第 5 期 中南大学学报( 自然科学版) Vol.47 No.5 2016 年 5 月 Journal of Central South University (Science and Technology) May 2016 DOI: 10.11817/j.issn.1672-7207.2016.05.033 考虑降雨及开挖影响下的厚覆盖层边坡渗流特征及稳定性 李涛1, 2 (1. 浙江海洋大学 海运与港航建筑工程学院，浙江 舟山，316022； 2. 浙江通衢交通建设监理咨询有限公司，浙江 衢州，324000) 摘要：基于厚覆盖层边坡失稳机理，结合广西桂林—北海高速公路某覆盖层路堑边坡实地情况，设计雨型相同但 降雨量不同的 3 种方案。采用有限元计算软件对考虑降雨及开挖影响下的厚覆盖层边坡渗流特征及稳定性进行研 究。研究结果表明：对于形式为“覆盖层土体+基岩”的边坡，其在强降雨作用下坡脚内部浸润线呈“J ”形变化； 坡脚土体饱和后浸润线沿土−岩交界面向上移动；在同等条件下，边坡开挖导致降雨入渗速度加快，浸润线呈的 “J ”形变化的特征更明显，且上升高度较开挖前有所提高；决定边坡初始状态下稳定性的主要因素有降雨初始 强度与边坡开挖状态，而决定边坡稳定性变化幅度的主要因素为降雨强度与降雨持续时间。 关键词：降雨入渗；边坡开挖；覆盖层边坡；渗流特征；边坡稳定性 中图分类号：TB115 文献标志码：A 文章编号：1672−7207(2016)05−1708−07 Seepage characteristics and stability of overburden slope considering rainfall and excavation LI Tao1, 2 (1. School of Maritime and Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China; 2. Zhejiang Tongqu Communications Construction Supervision Co. Ltd, Quzhou 324000, China) Abstract: Based on the slope failure mechanism of overburden slope, combined with the cut overburden slope on the ground of Guihai expressway in Guangxi Zhuang Autonomous Region, three rainfall schemes were designed. Using finite element analysis software, the thick overburden slope seepage characteristics and stability were studied considering the effects of precipitation and excavation. The results show that for the form of “overburden soil+bedrock” slope, the saturation line in the toe of slope changes as a “J” sh