CAJ | 학술논문

在浙江省宁波货运北站开展堆载对临近桩基内力与变形影响的1∶1原位现场试验，探讨深厚软土地区堆载高度、堆载与桩基距离等因素对桩身内力、位移、桩基和堆载间土体深层位移的影响规律。试验结果表明：临近堆载作用下，桩身向堆载的对侧偏移，最大值发生在桩顶处，且堆载对临近桩基的影响具有明显的时间效应；桩身弯矩在桩身上段26 m范围内较明显，其最大值大致位于软弱土层的底面；各工况下，桩身弯矩、桩身水平位移、桩与堆载之间土体的深层水平位移的分布规律基本相同，但其量值均随着堆载的临近与荷载强度的增加而增加。
재절강성저파화운북참개전퇴재대림근장기내력여변형영향적1∶1원위현장시험，탐토심후연토지구퇴재고도、퇴재여장기거리등인소대장신내력、위이、장기화퇴재간토체심층위이적영향규률。시험결과표명：림근퇴재작용하，장신향퇴재적대측편이，최대치발생재장정처，차퇴재대림근장기적영향구유명현적시간효응；장신만구재장신상단26 m범위내교명현，기최대치대치위우연약토층적저면；각공황하，장신만구、장신수평위이、장여퇴재지간토체적심층수평위이적분포규률기본상동，단기량치균수착퇴재적림근여하재강도적증가이증가。
Series of 1∶1 in-situ tests which were used to analyze internal force and deformation of pile founda-tion subjected to lateral soil movement by surcharge loading in deep-soft soil areas were carried out in Ningbo Cargo North Station of Zhejiang Province.The internal force and displacement of pile shaft,and the horizontal displacement of any soil stratum between pile foundation and surcharge loading were discussed along with the change of surcharge loading height and distance from the pile foundation.The test results indicate that the hori-zontal displacement of pile shaft caused by adjacent surcharge is opposite to the surcharge with significant time-dependent characteristics and its maximum value occurred at the pile top.Meanwhile,the bending moment in the pile shaft appears mainly at the range of 26 m below the ground,with its maximum approximately at the bot-tom of the soft soil.The distribution patterns of the bending moment of pile,the horizontal displacement of pile shaft and the soil strata are basically the same regardless of the test conditions,but all the values increase with the increasing magnitude of loading and the decrease of the distance between pile foundation and surcharge.