砂土中负摩擦力群桩效应系数模型试验研究  

Experimental study on the group piles effect coefficient of negative skin friction in sand

作　　者：缪云[1] 戴国亮[2] 黄挺[3] 

机构地区：[1]南通大学交通学院,南通226019 [2]东南大学土木工程学院,南京210096 [3]河海大学港口海岸与近海工程学院,南京210098

出　　处：《建筑结构》2014年第17期72-74,共3页Building Structure

基　　金：国家科技支撑计划项目(2011BAG07B01);973计划资助项目(2013CB036304)

摘　　要：通过群桩负摩擦力室内模型试验，探讨负摩擦力的群桩效应。结果表明：桩身轴力随着土载的增大而逐步增大，砂土固结完成后，随土载增大桩中性点位置逐步下移，最终基本位于距桩顶0．8～0．9倍桩长处；负摩擦力群桩效应系数随着桩间距的增大而增大，当桩间距达到6倍的桩外径时，群桩效应系数接近1．0。The group piles effect of negative skin friction was discussed through the indoor model test. Results show that axial force of the pile increases gradually with the increase of the soil load. After the concretion of the soil, the location of the neutral point of the pile moves down gradually with the increase of the soil load and locates in the 80% to 90% of the total pile length from the pile top eventually. The group piles effect coefficient of negative skin friction increases with the increase of pile spacing and it is close to 1.0 when the pile spacing reaches as long as 6 times of the pile outer diameter.

关 键 词：负摩擦力 群桩效应系数 模型试验 

分 类 号：TU473.1[建筑科学—结构工程]