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作 者:李阳 LI Yang(Sichuan Institute of Building Research,Chengdu 610081,China)
机构地区:[1]四川省建筑科学研究院有限公司
出 处:《四川建筑科学研究》2019年第5期68-72,共5页Sichuan Building Science
摘 要:提出了基于极限状态的悬臂式支护桩分析方法,与其他方法相比,考虑了垂直力的平衡条件,包括柱体单元重量和桩土相互作用的垂直分量。支护系统二维分析模型基于2个新特征:参数α和嵌入深度处的被动压力系数K b。利用极限分析的运动学方法,根据土体性质和其他载荷检查了悬臂式基坑支护桩的极限平衡状态。根据支护桩嵌入部分的被动压力和悬臂部分可承受的速度场,估计了嵌入部分被动土压力的极限值。本文方法的优点在于,在达到桩土承载力安全水平的条件下,能够设计更细长的悬臂式基坑支护桩。The proposed method for the analysis of cantilever support piles is based on ultimate limit states,but in contrast to other methods,also considers the condition of vertical force equilibrium,which includes the pile unit weight and the vertical component of the soil-structure interaction.The two-dimensional analytical model with polygonal soil pressure distribution is based on two new characteristics:the parameter α and the passive pressure coefficient at the embedment depth K b.The kinematic approach of limit analysis is used to examine the limit equilibrium state of the support pile according to soil properties and other loadings.The failure mechanism,composed of a classical determination of the passive pressure in the embedded part of the wall and a kinematically admissible velocity field at the retained side of the wall,estimates the limiting value of the passive earth pressure at the embedment depth.The advantage of the proposed method is that it enables the design of more slender cantilever support piles,at which the comparable level of safety for geotechnical and structural bearing capacity limit states is reached,which is the basic condition for safe design of retaining structures.
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