考虑损伤及非饱和效应的炭质泥岩路堤稳定性分析

发布时间：2019-06-06 20:46

【摘要】：为了分析降雨条件下炭质泥岩路堤的稳定性,基于考虑岩土体损伤的Hoek-Brown准则,结合非饱和抗剪强度理论,提出一种考虑损伤及非饱和效应的路堤稳定性分析方法,并利用该方法对算例炭质泥岩路堤的降雨入渗过程及稳定性进行研究。研究结果表明:提出的路堤稳定性分析方法具有较强的针对性和实用性,能够同时考虑损伤及非饱和效应对路堤稳定性的影响;在降雨条件下,边坡表层孔隙水压力变化幅度、暂态饱和区形成范围均与降雨强度、降雨时间呈正比;在降雨过程中,边坡表层孔隙水压力逐渐增大,暂态饱和区自坡面向路堤内部不断延伸,路堤表层及内部塑性区沿坡面及路堤内部不断向坡顶延伸,路堤安全系数逐渐降低;降雨停止后,边坡表层孔隙水压力持续降低,暂态饱和区自上往下逐渐消散,路堤表层及内部塑性区均先增加后减小,路堤安全系数先小幅度降低,后持续增大。
[Abstract]:In order to analyze the stability of carbonaceous mudstone embankment under rainfall conditions, based on the Hoek-Brown criterion considering rock and soil damage and the theory of unsaturated shear strength, a stability analysis method of embankment considering damage and unsaturated effect is proposed. The rainfall infiltration process and stability of carbon mudstone embankment are studied by using this method. The results show that the proposed embankment stability analysis method has strong pertinence and practicability, and can consider the influence of damage and unsaturated effect on embankment stability at the same time. Under the condition of rainfall, the variation range of pore water pressure and the formation range of transient saturation zone are proportional to the rainfall intensity and rainfall time. In the process of rainfall, the pore water pressure on the surface of the slope increases gradually, the transient saturation zone extends from the slope to the interior of the embankment, the plastic area of the surface and interior of the embankment extends to the top of the slope along the slope and the interior of the embankment, and the safety factor of the embankment decreases gradually. After the rainfall stops, the pore water pressure on the surface layer of the slope continues to decrease, the transient saturation zone dissipates gradually from top to bottom, the surface and internal plastic areas of the embankment increase at first and then decrease, and the safety factor of the embankment decreases at first and then increases continuously.
【作者单位】：长沙理工大学道路结构与材料交通行业重点实验室;长沙理工大学土木与建筑学院;长沙理工大学交通运输工程学院;现代公路交通基础设施先进建养技术湖南省协同创新中心;
【基金】：国家自然科学基金资助项目(51508040,51508042,51578082,51578079) 长沙理工大学土木工程重点学科创新性项目(15ZDXK08);长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目(kfj140302)~~
【分类号】：U416.12

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