引水暗渠湿陷性黄土-灰土挤密桩复合地基动力特性

采用时程分析法,对湿陷性黄土地基引水暗渠灰土挤密桩单桩—土体模型的动力特性进行研究,结果表明:在水平地震荷载作用下,桩顶的位移最大,桩与土接触位置桩的位移比土的位移大,桩竖向中心节点的应力很小,桩侧土体应力大且沿径向增大,桩底土体应力随深度增大减小趋势不明显.这些变化规律为多桩与土相互作用时节点位移和应力的变化规律研究和群桩—土体模型是否产生群桩效应分析提供参照依据,同时为桩—土—上部结构共同作用分析提供基础理论.

Dynamic characteristics of collapsible loess and lime-soil compaction pile composite foundation at underground water diversion canal

A time-history analysis was conducted of the dynamic characteristics of the mode of single lime-soil compaction pile and soil in a dark canal located in a collapsible loess foundation and the results indicated that under a horizontal earthquake load,the top of the pile had the biggest displacement,which was bigger than that of the soil at the position where the pile and soil contacted each other;the stress of the vertical central node in the pile was very small;the soil stress beside the pile was big and increased along the radial;the trend of soil stress under the pile becoming smaller was not obvious with the increase of the depth.Thus,the study of whether the soil and soil can produce a pile group effect and of the changing rule of the node’s displacement and stress under the interaction between the pile group and soil can provide certain references and also a good theoretical basis for an analyisi of the interaction of the pile and soil in upper dark canal structure.