摘要
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,利用数码相机对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,弹塑性阶段和破坏阶段。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。
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.
出处
《水运工程》
北大核心
2008年第11期41-45,76,共6页
Port & Waterway Engineering
基金
上海市重点学科科研项目资助(J50601)
上海市教育委员会科研项目资助(07ZZ99)
浙江省科技计划项目(2008C23023)
关键词
DPDM
水平荷载
桩侧土
位移
DPDM
horizontal load
sand on pile side
displacement
