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

发布时间：2018-06-05 01:35

本文选题：降雨入渗 + 边坡开挖　；参考：《中南大学学报(自然科学版)》2016年05期

【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。
[Abstract]:Based on the instability mechanism of the thick overlay slope, 3 Schemes with the same rain type but different rainfall are designed based on the field conditions of the cutting slope in the overburden layer of the Guilin Beihai Expressway in Guangxi. The seepage characteristics and stability of the thick overlay slope under the influence of rainfall and excavation are studied by the finite element calculation software. The results show that the results show that the seepage characteristics and the stability of the thick overlay slope are considered. For the slope with the form of "overlay soil + bedrock", the infiltration line inside the foot of the slope is "J" shape under the action of heavy rainfall, and the infiltration line moves upward along the soil rock interface after the soil is saturated. Under the same condition, the slope excavation leads to the acceleration of rainfall infiltration, and the characteristics of the "J" shape of the infiltration line are more obvious, and the elevation is higher than that of the slope. The main factors determining the stability in the initial state of the slope are the initial intensity of rainfall and the state of the slope excavation, and the main factor determining the slope stability is the rainfall intensity and the rainfall duration.
【作者单位】：浙江海洋大学海运与港航建筑工程学院;浙江通衢交通建设监理咨询有限公司;
【基金】：国家自然科学基金资助项目(51278067,51508040) 湖南省科学技术厅科技计划重点项目(2013FJ2008) 浙江交通厅科技计划项目(2014H22)~~
【分类号】：U416.14

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