【摘要】 实际工程中,工程桩一般先于基坑施工,基坑开挖使桩的上覆土卸荷,导致基坑内工程桩上浮受拉,严重时可将桩身拉断。采用有限元软件对基坑开挖时坑内工程桩的性态进行平面有限元分析,研究了不同开挖工况、不同桩土接触条件以及不同位置处工程桩的性状,计算结果显示:基坑开挖越深,桩顶位移、桩身受力越大;桩土接触越粗糙,桩顶位移越小,桩身受力越大;离坑边越远桩顶位移、桩身受力越大。更多还原

【Abstract】 In practical engineering,the engineering piles may be constructed earlier than pit excavation,which makes the overlying soil unloading and lead the engineering piles to floating and being in tension,and even induce the tensile failure of pile in severe case.A finite element software is utilized to make two-dimensional finite element analysis of the engineering piles.Then the characters of engineering piles in different excavation conditions,different contacting conditions between pile and soil and different location have been analyzed.The calculation results show that the bigger depth of excavation,the larger displacement of pile top and the larger forces of pile body,the more rough of interface between piles and soils,the smaller displacement of pile top and the larger forces of pile body,the farther away from pit boundary,the larger displacement of pile top and the larger forces of pile body.更多还原