U型钢板桩横向承载性能模型试验研究

Laboratory model tests on lateral bearing capacity of U-shaped steel sheet pile

采用1∶5的比尺模型试验,研究了横向加载过程中U型钢板桩的位移和土压力响应以及破坏模式,并对比分析了不同土质干湿状况、加载速率、埋置深度以及加载高度等影响因素下U型钢板桩位移和土压力的变化规律。试验结果表明,当U型钢板桩凸面加载时,位移随埋置深度、加载等级、加载高度的增加而增加,干砂中的位移大于湿砂中的位移;当凹面加载时,位移随着埋置深度的增加而减小,随着加载等级的增大而增大,在不同加载高度与不同土质干湿情况中差别不大。随着加载力增大,U型钢板桩在受力侧土压力分布呈现“R型”分布,且土压力均随着埋置深度与土体含水率的增大而增大。在加载力作用下桩体产生转动,并随着加载力的增大在距钢板桩底部约1/3埋置深度处发生弯曲。

Large scale tests were conducted to investigate the displacement and soil pressure responses and failure mode of an U-shaped steel sheet pile subjected to lateral loading.Effects of dry and wet conditions,loading rate,penetrating depth and loading height on the displacement and soil pressures were analyzed.Test results show that when the U-shaped steel sheet pile was loaded on the convex surface,the displacement increased with increasing loading height,buried depth,loading magnitudes,and the displacement in the dry sand was greater than that in the wet sand.When on the concave surface,the displacement decreased with increasing buried depth,increased with increasing loading magnitudes,and remain almost constant in different loading height and different soil dry and wet conditions.The distribution of earth pressure on the loading side of U-shaped steel sheet pile was R-shaped,which increased with increasing buried depth and soil moisture content.Tilting failure was triggerred for the U-shaped steel sheet pile with the increase of loading force,and the pile bends approximately 1/3 of buried depth from the bottom of the pile.