强降雨条件下考虑气压和渗流作用的边坡稳定性
收稿日期: 2021-08-12
网络出版日期: 2022-07-04
基金资助
中央高校基本科研业务费专项资金(2021YJS114);中国国家铁路集团有限公司科技研究开发计划重大课题(K2019G042)
Slope Stability Considering the Effects of Air Pressure and Seepage Under Heavy Rainfall Conditions
Received date: 2021-08-12
Online published: 2022-07-04
降雨入渗分析是预测工程灾害的重要手段之一.为了有效分析强降雨条件下边坡入渗过程,在经典Green-Ampt模型的基础上,建立了初始含水率在天然非均布条件下,考虑饱和带渗流和气压作用的边坡降雨入渗模型,并推导了相应的边坡稳定性系数表达式.研究表明:降雨入渗受边坡尺寸的影响明显,一方面,湿润锋迁移速率随坡长的增加而增加;另一方面,当考虑气压作用时,坡长越小,达到相同的湿润锋深度所需时间越长,当坡长增大到一定程度后,差别不大.此外,渗透力对边坡稳定性的影响比气压大,因为前者在降雨过程中逐渐增大,而后者基本不变,所以渗透力影响越来越大,气压影响越来越小.
姚茂宏, 陈铁林, 樊容, 杨子力, 石野 . 强降雨条件下考虑气压和渗流作用的边坡稳定性[J]. 上海交通大学学报, 2022 , 56(6) : 739 -745 . DOI: 10.16183/j.cnki.jsjtu.2021.302
Rainfall infiltration analysis is one of the important methods for predicting engineering disasters. In order to effectively analyze the infiltration process of slope under heavy rainfall, based on the classical Green-Ampt model, a slope rainfall infiltration model considering the effect of saturated zone seepage and air pressure under the condition of non-uniform distribution of initial water content was established, and the corresponding expression of landslide stability coefficient was derived. The results show that the influence of slope size on rainfall infiltration is obvious. On the one hand, the expansion rate of wetting front increases with the increase of slope length, on the other hand, when considering the effect of air pressure, the smaller the slope length, the longer it takes to reach the same wet front. When the slope length increases to a certain extent, the difference is not obvious. In addition, the influence of seepage force on slope stability is greater than that of air pressure. Because the former gradually increases during the rainfall process while the latter is basically unchanged, the influence of seepage force increases, and the influence of air pressure decreases.
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