地震作用下渗流边坡的动力响应耦合分析

发布时间：2018-04-29 02:28

本文选题：顺层岩质边坡 + 地下水　；参考：《水利水运工程学报》2017年01期

【摘要】：运用有限差分软件FLAC3D,建立某一赋含地下水的顺层岩质边坡三维模型,基于Finn动孔压增长模型,对边坡在地震作用下的加速度响应规律作了流固耦合分析,并就地下水对边坡塑性区分布的影响作了简要分析。数值计算结果表明:含地下水边坡的地震动峰值加速度PGA放大系数和坡顶加速度均大于无水边坡,地下水位升高时,PGA放大系数和坡顶加速度呈波动变化,当边坡土体处于完全饱和状态时,两者均明显增大;坡脚加速度随水位变化也呈波动状态,当边坡土体处于完全饱和状态时,同样明显增大;含地下水边坡的PGA放大系数等值线比不含地下水时的曲线分布更为杂乱,规律性较差,但仍具有明显的加速度垂直放大效应和临空面放大效应;表面风化层的塑性区随水位升高,其拉剪共同作用破坏单元逐渐增加,表面边坡的破坏效应逐渐增大。综合加速度、坡顶位移和塑性区分布来看,地下水对地震作用下顺层岩质边坡的稳定不利。
[Abstract]:Based on the finite difference software FLAC3D, a three-dimensional model of a bedded rock slope with groundwater is established. Based on the Finn dynamic pore pressure growth model, the acceleration response law of the slope under earthquake is analyzed by fluid-solid coupling analysis. The influence of groundwater on the distribution of slope plastic zone is briefly analyzed. The numerical results show that the peak acceleration of ground motion and the peak acceleration of slope with groundwater are higher than those of anhydrous slope. When the groundwater level rises, the magnification factor of ground motion and the acceleration of slope top fluctuate. When the slope soil is fully saturated, both of them increase obviously, and the acceleration of slope foot fluctuates with the water level, and when the slope soil is fully saturated, it also increases obviously. The PGA magnification factor isoline of the slope with groundwater is more disorderly and less regular than the curve without groundwater, but it still has obvious acceleration vertical amplification effect and empty surface amplification effect. The plastic zone of the surface weathering layer increases gradually with the increase of water level, and the failure effect of the surface slope increases gradually. Considering the acceleration, top displacement and plastic zone distribution, groundwater is unfavorable to the stability of bedding rock slope under earthquake.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金资助项目(51579173) 国家科技支撑计划资助项目(2013BAB05B05) 国家重点研发计划(2016YFC0401705)
【分类号】：TU435

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