论文部分内容阅读
采用包含一个内变量的连续化St Venant模型,即连续的Masing-Iwan模型,模拟桩-土界面扰动区土体的非线性行为。基于两种分析单桩的荷载传递模型,假设桩-土-桩相互作用为弹性且服从叠加原理,推导出了适用于群桩中基桩的两种荷载传递新模型。采用荷载传递法建立了单桩和群桩的非线性控制方程,提出了近似求解该控制方程的摄动分析法,得出了单桩和群桩的荷载沉降和轴力分布方程。所得结果表明,在低荷载水平下严格趋近于弹性解;而在高荷载水平下,能够反映直到破坏阶段的桩的荷载-沉降特性。通过一个现场试验的理论预测结果与实测数据的对比分析,验证了方法的有效性和适用性。
The non-linear behavior of the soil in the disturbance zone of pile-soil interface is simulated by using a continuous St Venant model with an internal variable, namely the continuous Masing-Iwan model. Based on the two models of load transfer of single pile, two kinds of load transfer models suitable for pile foundation in pile group are deduced assuming that pile-soil-pile interaction is elastic and subject to superposition principle. The nonlinear governing equations of single pile and group pile are established by using load transfer method. The perturbation analysis method of solving this governing equation is proposed and the equations of load settlement and axial force distribution of single pile and group pile are obtained. The results show that the solution approaches the elastic solution strictly at low load level and the load-settlement characteristic of the pile up to the failure stage under high load level. Through the comparison and analysis of theoretical predictions and measured data of a field experiment, the validity and applicability of the method are verified.