施工期码头桩基承载特性影响因素有限元分析

Finite element analysis of influential factors of pile foundation's bearing characteristics

内河库区码头后方陆域陡峭且地形条件复杂,码头的建造常常面临大水位差、高填方回填岸坡的施工特点,因此施工期的桩基不仅承受上部结构传来的施工荷载,还要承受岸坡回填施工对桩基造成的影响。采用有限元软件PLAXIS,在先建桩和先回填两种方式下,通过桩基承载力的分析,得出了增加回填土厚度、增加岸坡坡度、增加岸坡回填材料密度、减小回填材料内摩擦角、减小嵌入深度均不利于回填岸坡桩基承载力的改善,并揭示了其敏感性。为内河库区港口工程桩基设计提供理论依据。

The land behind the inland reservoir pier is steep and with complex terrain conditions and the construction of pier often faces a large water level difference and large backfilling. So, the pile foundation bears both the construction load from the upper structure and the effect from the bank slope＇s backfilling construction during the construction period. Using the finite element software plaxis, we analyze the pile foundation＇s bearing capacity under two modes including building pile foundation first and backfilling first, and get the conclusion that all measures including increasing the thickness of backfill, increasing the slope gradient, increasing the severe of slope backfill material, reducing the friction angle within the backfill material, reducing the depth of rock-socketed, are not conducive to the improvement of the backfill slope pile＇s bearing capacity. It provides a theoretical basis for the pile foundation design of wharf engineering in inland reservoir.