静压托换桩压桩力与单桩承载力关系研究

Study on the Relationship between the Jacking Force of Static Pressure Underpinning Pile and the Bearing Capacity of Single Pile

静压桩托换技术是既有建(构)筑物地基加固的常用方法之一,该技术具有受力直观,承载力可靠,加固效果显著等优点。根据托换桩终止压桩力来估算单桩承载力,对于托换桩的优化设计具有重要意义。论文结合某实际工程,基于L-M优化算法建立了单桩承载力与终止压桩力之间的拟合公式Q_(uk)=1.543L/2.39+L R_(sm)。基于L-M优化算法计算得到的单桩承载力估算值,其精度和准确性均优于传统方法的预测结果,可为黄土地区静压托换桩优化设计和施工监测提供参考和借鉴。

Jacked pile underpinning technology is one of the common methods for foundation reinforcement of existing buildings.It has the advantages of intuitive bearing capacity,reliable bearing capacity and remarkable reinforcement effect.It is very important to estimate the bearing capacity of a single pile according to the ultimate pressure of the underpinning pile for the optimum design of the underpinning pile.Based on the L-M optimization algorithm,the paper established the fitting formula between the bearing capacity of single pile and the end pressure of the pile Q_(uk)=1.543L/2.39+L R_(sm).The accuracy and accuracy of the single pile bearing capacity estimated by L-M optimization algorithm are better than those predicted by traditional methods,it can provide reference and reference for the optimum design and construction monitoring of static pressure underpinning pile in loess area.