地层条件对剪胀性砂土边坡地震后延迟变形的影响

发布时间：2018-06-15 12:08

本文选题：砂土 + 剪胀　；参考：《岩土工程学报》2016年07期

【摘要】：剪胀性砂土流滑现象与自然排水条件下孔压重分布导致的局部土体强制吸水有关,须放在具体边值问题中来阐释。同时考虑孔隙水压力扩散、转移以及吸水剪切下饱和砂土应力应变行为的流动变形简化分析方法,研究了相对不透水层的位置、地基土体的渗透系数对边坡地震后延迟变形的影响特征和规律。地震后延迟侧向变形总是集中发生在孔隙水渗流被阻滞的界面,界面处砂土强制吸水量越大,发生的侧向位移量就越大;设置穿透相对不透水层的排水通道可有效减小边坡的侧向变形。地震后侧向流动变形的发展过程取决于孔隙水扩散、转移的速度,是由具体边值问题中土体的渗透系数决定的,饱和土体的黏滞特性对于变形发展过程的影响可以忽略。
[Abstract]:The phenomenon of shear-expansion sand flow slip is related to the forced water absorption of local soil caused by the distribution of pore pressure under natural drainage conditions, which should be explained in the concrete boundary value problem. At the same time, the position of the relative impermeable layer is studied by taking into account the simplified flow and deformation analysis method of saturated sand under pore water pressure diffusion, transfer and water absorption shear. The influence of soil permeability coefficient on the delayed deformation of slope after earthquake. The delayed lateral deformation always occurs at the interface where pore water seepage is blocked, and the larger the forced water absorption of sand at the interface, the larger the lateral displacement occurs. The lateral deformation of the slope can be effectively reduced by setting the drainage passage through the relative impermeable layer. The development process of lateral flow deformation after earthquake depends on the velocity of pore water diffusion and transfer, which is determined by the permeability coefficient of soil in the specific boundary value problem, and the influence of the viscous property of saturated soil on the deformation development process can be neglected.
【作者单位】：重庆大学土木工程学院;水沙科学与水利水电工程国家重点实验室;西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51209179) 水沙科学与水利水电工程国家重点实验室开放研究基金项目(sklhse-2015-D-02)
【分类号】：TU435

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