地震作用下饱和回填砂土重力式挡土结构滑动与转动位移分析

发布时间：2018-07-01 17:46

本文选题：土力学 + 地震　；参考：《岩石力学与工程学报》2016年01期

【摘要】：预测地震作用下重力式挡土结构的位移是基于位移抗震设计方法的关键。基于Newmark滑动理论、超孔隙水压力应力模型和累积损伤原理,建立饱和回填砂土中超孔压比时程计算模型,以及墙体滑动和转动临界加速度时程计算模型。基于所建立的模型,提出用于计算饱和回填砂土重力式挡土结构滑动和转动位移的计算方法。采用该方法,分析土体参数和地震动参数对墙体滑动及转动位移的影响,并对墙体滑动与转动的耦合作用进行研究。结果表明,填土不发生液化的情况下,滑动位移对土体相对密度和墙体与地基土间的摩擦角十分敏感;转动位移对输入地震的震级、水平加速度和竖向加速度、填土的内摩擦角、墙背摩擦角和相对密度均较为敏感。超孔隙水压力对墙体滑动和转动位移的影响不可忽视。在地震作用下墙体与墙后填土破坏土楔体共同运动的假设条件下,墙体滑动与墙体转动相互抑制。
[Abstract]:The prediction of the displacement of the gravity retaining structure under seismic action is the key to the displacement seismic design method. Based on the Newmark sliding theory, the super pore water pressure stress model and the cumulative damage principle, the time history model of the pore pressure ratio in the saturated backfill sand is established, and the calculation model of the wall sliding and the rotational critical acceleration time history is based on the model. The model is used to calculate the sliding and rotational displacement of the gravity retaining structure in saturated backfill sand. By this method, the effect of soil parameters and ground motion parameters on the sliding and rotational displacement of the wall is analyzed, and the coupling effect of the sliding and rotation of the wall is studied. The results show that the filling is not liquefied. Under the circumstances, the sliding displacement is very sensitive to the relative density of the soil and the friction angle between the wall and the foundation soil, and the rotational displacement is sensitive to the magnitude of the earthquake, the horizontal acceleration and the vertical acceleration, the internal friction angle of the fill, the friction angle of the wall and the relative density. It is considered that under the assumption that the wall and the earth fill behind the wall are destroyed by the earthquake, the wall sliding and wall rotation are mutually restrained.
【作者单位】：大连理工大学海岸及近海工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51478077) 交通运输部项目(JTSBD 2013 02 130)~~
【分类号】：TU435

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