盾构施工引起的邻近基桩桩侧水平土压力变化规律

来源 :中国建筑学会地基基础分会2014年学术会议 | 被引量 : 0次 | 上传用户:duzhiwei1010
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如今正是轨道交通快速发展的阶段,各种地铁隧道建设如火如荼,而地铁隧道建设最主要的技术手段即为盾构施工。运用有限元软件PLAXIS 3D对盾构施工引起的邻近基桩桩侧水平土压力变化规律展开研究,分析了盾构施工过程中邻近基桩桩侧水平土压力沿桩长分布变化规律,桩侧水平土压力变化最大的桩身断面处桩侧水平土压力沿环向分布变化规律,以及桩身不同断面处桩侧总水平土压力变化规律.研究表明:盾构施工过程中桩侧水平土压力变化最大位置处于隧道中心线埋深处基桩断面临开挖面侧.此断面处桩侧水平土压力环向分布形式在刀盘接近基桩过程中呈蛋形,临开挖面水平土压力增加量大于背开挖面水平土压力增加量;在刀盘到达及穿越基桩过程中呈近似椭圆形;在刀盘远离基桩过程中呈心形.桩侧总土压力变化规律分为3个部分,桩身上部0~16m增大,桩身中部16~24m减小,桩身下部24~50m基本不变.
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