基于定点剪出法抗滑桩滑坡推力分布形式的确定

Distribution of Landslide Thrust on Anti-slide Pile Ascertained by Specified Shear Opening Method

针对现有滑坡推力分布假设为三角形、矩形或梯形等不合理现状，提出基于定点剪出假设确定滑坡推力分布的方法。在不平衡推力法的基础上，分析桩身若干点以上潜在滑体稳定性对滑坡推力的影响，然后在相邻段滑坡推力分布为线性的条件下，计算全桩若干点处滑坡推力的分布值。结果表明，定点剪出潜在滑体的稳定性对滑坡推力分布影响较大，若该稳定系数大于工程安全要求时，则无滑坡推力产生，若该稳定系数小于工程安全要求且相邻段稳定系数相差较大时，滑坡推力分布将会产生突变。最后通过一个边坡支护桩滑坡推力分布的工程实例，对该理论分析的合理性进行了说明。且在抗滑桩结构设计中，可根据桩身若干点滑坡推力分布值，采用变截面配筋，以节省工程投资。

The distribution of landslide is assumed approximately triangular, rectangular, or trapezoid irrationally. A new method that distribution of landslide thrust determined by a specified shear opening hypothesis is proposed. Under the imbalance thrust method, the influence between stability of potential landslide and landslide thrust is analyzed. Distribution of landslide thrust of whole pile is then calculated by condition that the distribution of contiguous section is linear. The result shows that the effect of stability of fixed shear potential landslide on distribution of landslide is great, if the safety coefficient is larger than the designed value, the landslide thrust is not produced, if the safety coefficient is less than the designed value, and the safety coeffi- cient of adjacent segment different obviously. The distribution of landslide can produce diversification. An analysis of the case example indicates the rationality of the cognition present. Under the design of anti-slide pile, according to calculation of distribution value of landslide thrust, reinforcing steel bar of section can be changed, and invest of the project can be saved.