考虑预应力损失桩-锚结构内力计算的加权残值法

针对已有锚索抗滑桩计算模型的不足，按锚索抗滑桩实际的受力过程，考虑了施工阶段锚索预应力的损失及桩体位移对桩锚协调方程的影响，分别在预应力施加和滑坡推力作用阶段建立计算模型，并基于加权残值法建立了锚索抗滑桩的内力与变形计算方法。同时，基于Matlab平台编制了锚索抗滑桩的计算程序，将该程序对已有的工程实例进行分析，并与现有的桩锚计算模型进行对比，结果表明，该模型能很好地体现锚索抗滑桩在预应力施加阶段主动受力这一特殊过程对桩锚位移协调方程的影响，且能考虑下排锚索施工对上排锚索造成的预应力损失；而且与现有的计算模型相比，本模型更加符合工程实际。

Calculation of the internal forces of pile-anchor cable structure considering the prestressed loss based on weighted residual method

To resolve the deficiencies of the calculation model for anti-sliding pile with prestressed anchor cable, a calculation model that considers prestress and landslide thrusting stage according to the actual construction process and loading conditions of anti-slide pile with anchor cable was established. The impact of prestress loss of anchor cable and displacement of pile in construction stage on displacement compatibility of pile-anchor cable is considered. Meanwhile, the method to calculate the internal forces and deformation of anti-sliding pile with prestressed anchor cable was established based on weighted residual method. A calculation procedure of anti-slide pile with anchor cable was created based on Matlab platform, which was used to analyze engineering examples. The results were compared with those obtained from the conventional calculation model. It is shown that the improved model can incorporate the effect of the special process of anti-slide pile with anchor cable bearing active load in the prestressed stage on displacement compatibility of pile-anchor cable. Also, the improved model properly takes into account the prestress loss of upper anchor cable, which is caused by the lower anchor cable in prestressed stage. Furthermore, compared with the conventional calculation model, the improved model is more in line with the engineering practice.