浅层就地固化桩土刚性复合地基沉降计算新方法

New Calculation Method of Shallow In-Situ Solidification Technology Combined with Pile-Soil Rigid Composite Foundation

摘要:

针对就地固化桩土刚性复合地基沉降计算研究的不足及现行规范此类工况沉降计算方法的局限性，首先剖析了就地固化桩土刚性复合地基沉降机理，分析了土拱效应下的桩端应力分担比例和等沉面以上负摩阻区的附加应力对沉降的影响，提出了就地固化桩土刚性复合地基沉降计算的新方法，并通过数值模拟和工程实例进行了验证。验证结果表明，就地浅层固化土技术，可强化土拱效应、增强桩基传递效应，能有效减小复合地基的整体沉降，新沉降计算方法准确可靠。

Abstract:

Considering the shortcomings of settlement calculation research on shallow in-situ solidification combined with pile-soil rigid composite foundation， and the limitation of settlement calculation method in current specifications under similar working conditions， this paper analyzes the settlement mechanism of shallow in-situ solidification combined with pile-soil rigid composite foundation， studies the sharing proportion of pile end stress under the soil arching effect，analyzes the settlement influence of the additional stress in the negative friction area above the equal settlement surface， and proposes a novel settlement calculation method for the shallow in-situ solidification combined with pile-soil rigid composite foundation. The numerical simulation and engineering practice， indicate that the shallow in-situ solidified soil technology can strengthen the soil arching effect， enhance the pile foundation transfer effect， and effectively reduce the overall settlement of the composite foundation. The settlement calculation method proposed in this paper is accurate and reliable.