预应力锚索抗滑桩的改进计算方法

针对现有预应力锚索抗滑桩计算中存在的问题，提出了改进计算方法，即根据预应力锚索抗滑桩的实际施工过程和受力条件分阶段计算，特别在第1阶段计算预应力作用下抗滑桩的内力时应该考虑桩后滑面以上岩土体的反力作用。通过算例对现有计算方法和改进计算方法的计算结果进行分析比较，并通过与抗滑桩实测内力结果的对比分析表明，改进计算方法由于理论上的合理性使其计算结果更接近实测值，这对预应力锚索抗滑桩在滑坡整治工程中的合理设计具有重要意义。

IMPROVED METHOD FOR COMPUTING ANTI-SLIDING PILE WITH PRESTRESSED ANCHORING CABLE

Aiming at the existing problems in the method for computing anti-sliding pile with prestressed anchoring cable,an improved method is proposed in this paper. According to the actual construction process and mechanical condition of the pile and the prestressed anchoring cable,the internal force of the structure should be computed in two steps. Firstly,the pile under the prestress of the anchoring cable and a part of sliding thrust will be taken into account in computation. It should be pointed out that the subgrade reaction over the slip surface behind the pile should also be taken into consideration in the calculation of the prestress. Secondly,the pile under the computed sliding thrust should be calculated and the concerted deformation of the pile and the anchoring cable must be considered. A model test on the character of the internal force of prestressed anti-sliding pile is conducted,and the pile is calculated using the improved method and the existing method. The comparison between the computation results and the test results shows that the satisfying results can be obtained by the improved method.