浆固碎石桩单桩荷载传递特性研究

Analysis of load transfer characteristics of single grouted gravel pile

浆固碎石桩是加固软土地基的一种新型桩基技术,已成功应用于高速公路和高速铁路等工程软土地基处理。为了研究浆固碎石桩单桩荷载传递机制,假定浆固区压缩模量呈指数分布,应用圆形承载板作用下的半空间体位移的解,对竖向荷载作用下单桩复合地基各部分沉降进行分析,推导出桩轴向压应力、桩侧摩阻力和桩顶沉降计算公式。现场试验实测结果与理论计算结果对比表明,理论计算值与实测值相吻合,验证了理论计算公式的合理性。

Grouted gravel pile is a new technique of piles for reinforcing soft soils.It has been successfully used in construction of projects of expressway and high-speed railway.In order to study the load transfer mechanism of the pile,under the assumption that the compression modulus is obeyed the exponential distribution in reinforced zone,and based on the solution of settlement in half-space under circular bearing plate,the settlements of different parts of grouted gravel pile composite foundation under loads are analyzed;and the formulas of axial force,lateral friction resistance along the grouted gravel pile,and settlement on the top of pile are derived.The practicability of this method is illustrated by a case study.It is shown that the theoretical calculation results are close to the actual measurement results.Therefore the deduced equations are reasonable.