永久全护筒嵌岩灌注桩荷载-沉降分析

Load-Settlement Analysis of Perpetual Fully-cased Rock-socketed Concrete Pile

永久全护筒嵌岩灌注桩是指深厚软土中钻孔或清孔、灌注混凝土时使用全护筒护壁,成桩后护筒不予拔出,而是留在土中与桩身一起承载且桩端嵌入岩层的钢护筒-混凝土组合结构。其荷载传递过程可以分为5个阶段,每一阶段选择与之相应的桩岩间桩端阻力荷载和侧向摩阻力荷载传递模型,基于荷载传递函数法,推导出荷载传递过程中每一阶段临界点的荷载-沉降计算公式,并通过珠海市横琴区某桩基工程的1#楼1#-20#桩的静载试验数据验证其合理性。

Permanent fully-cased rock-socketed filling pile which is a type of rock-socketed steel tube-concrete composite structure in deep soft soil,and which adopts full steel casing tube protection when drilling,cleaning hole or pouring concrete,and its steel casing tube is left in the soil for bearing force after the pile is formed. Divided the load transfer process of the perpetual fully-cased rock-socketed concrete pile into five stages. Based on the static loading test data of 1#building 1#-20#pile of a flow soft soil area in Hengqin District of Zhuhai City proved the rationality of these formulas.