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在室内模型试验中对模型桩顶施加水平荷载,分别采用数字照相无标点变形量测系统及配套量测分析软件形象地再现了不同密实度砂土中桩周土体及地表土体水平位移分布规律。对双桩的地表水平位移分布情形进行观测分析,结合桩顶位移与水平荷载的关系研究了桩间距对桩与桩之间的相互作用的影响。应用颗粒流程序PFC2D模拟一定深度平面内桩周土体位移,揭示了主动桩桩周土的颗粒流动性状及桩间距对桩-土相互作用的影响。结果表明,主动受荷桩桩周砂土位移场呈两个纺锤体状;砂土密实度增加,桩前砂土变形范围增大;桩间距越小,相邻桩相互影响越明显。
In the indoor model test, horizontal load is applied to the top of the model pile. The horizontal displacement distribution of soil around the pile body and surface soil in different compacted sandy soils are reproduced by using the digital photogrammetric non-punctual deformation measuring system and supporting measurement and analysis software respectively law. The horizontal displacement distribution of the two piles is observed and analyzed. Based on the relationship between the displacement of top piles and horizontal load, the effect of pile spacing on the interaction between piles and piles is studied. The particle flow program PFC2D was used to simulate the displacement of soil around the pile in a certain depth. The particle flow behavior of the surrounding soil and the effect of pile spacing on the pile-soil interaction were revealed. The results show that the displacement field of sand around active loading pile is two spindle bodies, the density of sandy soil increases and the deformation range of sand before pile increases. The smaller the spacing of pile, the more obvious the interaction between adjacent pile.