抗滑桩设计推力计算探讨

滑坡推力是滑坡整治设计的重要依据。本文建立了剩余推力法计算滑坡推力的力学模型，并给出了在不同荷载作用下的滑坡剩余推力表达式。当前抗滑桩设计推力的取法有三种：一种是直接将剪出口的推力差值P1作为设计推力，目前抗滑桩设计中多采用此法；一种是将设桩处的推力差值P2作为设计推力；一种是将设桩处的推力差值P2与剪出口的推力差值P1比较取其大者作为设计推力，这三种设计推力的取法都不科学。因为取P1作为设计推力没有明确的力学根据，取P2作为设计推力由于没有考虑桩前岩土体的抗力，往往偏小。笔者深入探讨了抗滑桩设计推力的计算方法并建立了抗滑桩的设计推力的确定方法，对抗滑桩的应用及设计具有一定的参考作用。

Inquiring into Calulation of Design Thrust of Anti-Slide Pile

The landslide thrust is the foundation to harness landslide. The mechanical model of landslide thrust calculation and the expression of landslide residual thrust in different load composition are established.There are three ways to determine landslide design thrust. The first way is taking P 1 (the residual thrust of the last piece of landslide) as design thrust. The second way is taking P 2 (thing residual thrust of the piece of landslide where anti slide pile is set up) as design thrust. The third way is taking P 3 (the larger one between P 1 and P 2) as design thrust. All the three ways to determine landslide design thrust are unscientific. Based on mechanism analysis of landslide residual thrust, the function of anti slide pile in slope engineering is inquired deeply. A method to determine the design parameter of anti slide pile is set up, which is useful for designing and utilizing anti slide pile.