邻近斜坡静压沉桩挤土效应试验

发布时间：2019-06-30 20:42

【摘要】：为了给邻近斜坡条件下的沉桩设计与施工提供参考,采用改装后的静力触探仪作为沉桩加载设备,对邻近斜坡沉桩挤土进行试验研究。试验装置主要由主体结构、加载系统、土压力测试系统以及位移量测设备组成,具有可确保模型桩连续贯入土体、实现对沉桩速率进行控制、实时监控桩侧挤土压力、动态追踪沉桩过程中桩侧挤土位移等特点。试验结果表明:在桩体贯入过程中,挤土位移的影响范围不断增加,桩周土体的位移模式也随之变化;距桩体及桩端较近范围内的土体,在桩体径向挤压和桩侧摩擦的共同作用下,产生了向下的位移;距桩体距离较远的土体,由于地表及斜边自由边界的存在,表现为竖向隆起位移;在沉桩达到一定深度后,后续沉桩对挤土位移影响较小。研究结果揭示了邻近斜坡沉桩挤土力学响应与坡体变形的内在机理,可为实际工程设计、施工参数设置以及挤土位移控制提供参考。
[Abstract]:In order to provide reference for pile-sinking design and construction under the condition of adjacent slope, the modified static sounding instrument is used as the pile-sinking loading equipment to test the pile-sinking of the adjacent slope. The test device mainly comprises a main body structure, a loading system, a soil pressure testing system and a displacement measuring device, In this paper, the characteristics of pile-side squeezing displacement during the pile-sinking process are dynamically tracked. The results show that in the process of pile penetration, the influence range of the soil squeezing displacement is increasing, and the displacement pattern of the soil body in the post-pile is also changed. The soil mass in the close range from the pile and the pile end, under the mutual action of the radial extrusion of the pile and the friction of the pile side, the downward displacement is generated; The soil mass which is far away from the pile body is the vertical uplift displacement due to the existence of the free boundary of the surface and the inclined edge; after the pile sinking reaches a certain depth, the effect of the subsequent pile-sinking on the soil-squeezing displacement is small. The results of the study reveal the internal mechanism of the mechanical response and the deformation of the slope in the adjacent slope, which can provide a reference for the practical engineering design, the parameter setting of the construction and the control of the displacement of the soil.
【作者单位】：上海理工大学环境与建筑学院;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金青年基金项目(51208301);国家自然科学基金项目(41272288) 上海高校青年教师培养资助计划项目(SLG12019)
【分类号】：TU473.1

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