实体桩复合地基承载原理

实体桩指目前在地基处理中普遍采用的低强度混凝土桩、水泥土柱等刚性桩、半刚性桩、实体桩复合地基承载原理分为两种：被动上刺原理和主动下刺原理。复合地基由桩、桩间土及其上的褥垫层组成。上部结构通过基础将荷载传递给褥垫层，褥垫层根据桩、桩间土及其与褥垫层的共同作用，再分配给桩、桩间土。基桩承载力的大小受到群桩效应、负摩阻力等因素的影响。桩土应力比最终值是褥垫材料性能、厚度、应力状态、桩与桩间土刚度等的函数

LOAD-BEARING PRINCIPLE OF SOLID PILE IN COMBINED FOUNDATION

Solid pile means rigid and semi-rigid pile with low strength concrete and cement commonly used in foundation treament.Its load-bearing principle is classed into two:passive top-punturing and active down-punturing.Combined foundation consists of piles,pile soil and mattress layer.Load at top structure is transmitted to mattress layer through foundation,then to pile and soil by the action of pile,pile soil and mattress layer.Foundation pile load is affected by group pile effect and negative friction resistance and etc.End value of soil stress ratio is a funtion of performance,thickness,stress state of mattress materials,and pile and soil stiffness. Calculation method for pile load and strength,combined load,mattress layer thickness,foundation settlement is described in the paper.