降雨对路堤斜坡稳定性影响的时间效应

发布时间：2018-06-09 02:17

本文选题：降雨 + 时间效应　；参考：《岩土力学》2015年S1期

【摘要】：以某高速公路填筑试验路堤为例,基于非饱和土渗透及强度理论,采用渗流场与应力场、稳定性计算耦合的方法,对两种不同透水特性的路堤在降雨过程中孔隙水压力和稳定性系数随时间变化的特点及规律进行较为深入的探讨。结果表明,(1)透水性能较好的路堤斜坡下部降雨入渗要强于斜坡上部,透水性能较差的路堤斜坡,雨水往往以近似于均匀的形式入渗;(2)透水能力强的路堤斜坡在短暂的超强降雨或者强度较低但持续时间超长的降雨过程中,其最小稳定性系数易于出现滞后现象,一般滞后0.5~3 d,透水能力差的路堤斜坡最小稳定性系数有显著滞后特点,一般滞后7~15 d;(3)总降雨量一定、雨强大于等于50 mm/d条件下透水能力强斜坡能达到的最小稳定性系数随降雨时间增长而降低,而透水能力差的斜坡最小稳定性系数受雨强和降雨时间共同影响。
[Abstract]:Based on the theory of permeability and strength of unsaturated soil, the coupling method of seepage field and stress field is used to calculate the stability of a highway embankment filled with test embankment. The characteristics and regularity of the variation of pore water pressure and stability coefficient with time during rainfall for two kinds of embankments with different permeable characteristics are discussed. The results show that the rainfall infiltration in the lower part of the embankment slope with better permeability is stronger than that in the upper part of the slope, and the embankment slope with poor permeability is better than that of the embankment slope with poor permeability. The embankment slope with strong permeable capacity often infiltrates in a uniform form in the form of Rain Water. During the short period of super heavy rainfall or the rainfall with low intensity but long duration, the minimum stability coefficient of the embankment slope is prone to lag. In general, the minimum stability coefficient of embankment slope with poor permeability is obviously delayed by 0.5 ~ 3 days, and the total rainfall of embankment slope with a delay of 715 days is constant. The minimum stability coefficient of the strong permeable slope decreases with the increase of rainfall time when the rainfall intensity is greater than 50 mm/d, while the minimum stability coefficient of the slope with poor permeability is affected by both rain intensity and rainfall time.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：973国家重点基础研究计划项目(No.2013CB733200) 国家自然科学基金(No.41202212,No.41472274) 成都理工大学地质灾害防治与地质环境保护国家重点实验室自主课题(No.SKLGP2012Z008)
【分类号】：U416.12

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