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邻近斜坡静压沉桩挤土效应试验

, PP. 25-31

Keywords: 道路工程,静压沉桩,模型试验,斜坡,挤土位移

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Abstract:

?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。

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