基于DPDM技术的水平受荷桩侧土位移分析

应用数字照相变形量测DPDM(The digital photogrammetry for deformation measurement)技术对水平受荷桩的桩侧土位移进行分析.通过室内模型单桩单向水平循环荷载实验,利用数码相机时实验过程中桩侧土体的变化进行全程拍摄,应用DPDM技术对拍摄结果进行处理,得出桩侧土体的位移场分布.桩身的变形分为弹性阶段,弹垫性阶段和破坏阶段.破坏荷载下,主动侧土体塑性变形区宽度为桩径的0.5倍,深度与桩身变形深度相同;被动侧土体塑性区域呈半个倒锥形,主要分布在沿桩身0.37倍桩入土深度内.锥形侧表面尾端与土表面成60°夹角.

Displacement analysis of fine sand on laterally loaded pile side based on the DPDM technology

Applying DPDM(the digital photogrammetry for deformation measurement) technology,the displacement of fine sand on the laterally loaded pile side was analyzed.On the basis of geotechnical experiment of laterally loaded pile in the lab,we take photos of fine sand side of the pile during the experiment,through which,we obtained the filed distribution of displacement.The deformation progress of the pile can be divided into 3 parts: elasticity,plasticity,and damage.Under the damage load,the width and depth of soil deformation area on the driving side is as large as a half of the pile diameter and the depth of pile deformation area separately.While the deformation area on the passive side,which is mostly distributed as deep as 0.37 times of the depth of pile,is shaped as an inverted half-cone,the end of whose side and the soil surface forms an angle of 60 degrees.