基于桩帽尺寸调整的桩网复合地基沉降控制方法研究

为研究桩网复合地基沉降控制中的桩帽尺寸优化调整问题,采用楔形土拱模型和荷载传递理论分析桩帽尺寸对桩网复合地基桩土荷载分担及沉降变形的影响规律,依据桩土总沉降位移和沉降差控制标准,提出基于桩帽尺寸调整的桩土沉降控制方法,给出桩帽尺寸确定原则。研究结果表明:桩帽的设置可有效提高桩体分担荷载,并进一步引起桩体沉降位移的增加和桩间土沉降位移的减小,且桩顶位置桩土沉降差随桩帽尺寸增加保持递减趋势。研究成果可为铁路和公路工程中的桩网复合地基布桩参数确定及桩帽尺寸优选提供必要技术支持。

Settlement Control of Pile-net Composite Foundation Based on Pile Cape Size Optimization

In order to study the pile cape size optimization for settlement control of pile-net composite foundation,wedged soil arch model and load transfer theory are applied to analyze the effect of the pile cape size on pile efficacy and composite foundation settlement. In accordance with the control standards for total pile-soil settlement and differential settlement,a pile-net settlement control method is proposed based on the pile cape size optimization,and the principle to define the pile cape size optimization is also offered. Research results show that the setting of pile cape increases the pile efficacy effectively,and the pile-soil differential settlement at the pile top decreases with the increase of pile cape size,while the pile settlement is increasing and the soil settlement is decreasing. The research results can be referred to the design of pile-net composite foundation layout and the pile cape size optimization during railway and highway engineering.