多层滑带滑坡抗滑桩桩后推力分布计算方法研究

STUDY ON DISTRIBUTION AND CALCULATION OF THRUST ON STABILIZING PILE OF THE MULTI-SLIDING ZONES LANDSLIDE

多层滑带滑坡演化过程具有多级滑体相对运动、应力非连续性特点,由于不同层滑体间的相对运动,多层滑带滑坡内的推力分布形式往往比较复杂,亟需提出针对多层滑带滑坡的抗滑桩桩后推力分布计算方法。本文采用水平极限平衡法对多层滑带滑坡进行分析,根据水平微段极限平衡状态下的受力分析,可计算抗滑桩桩后每层滑体内的滑坡推力。在分析竖直方向的受力平衡时,需要考虑不同层滑体向下的受力传递,从而导致滑坡推力分布函数在滑带处存在突变。据此推导出了多层滑带滑坡的抗滑桩桩后推力分布函数,并通过数值模拟进行了工程案例验算分析,验算结果表明了该方法的可靠性。本文提出的多层滑带滑坡抗滑桩桩后推力分布计算方法,为多层滑带滑坡的防治理论提供了一定的参考。

The evolution process of landslides with multi-sliding zones is characterized by the relative motion of multi-layer and stress discontinuities.Due to the mutual dislocation and pile-soil interaction between sliding bodies in different layers,the thrust distribution of the multi-sliding zones landslide is often complex.It is urgent to put forward the calculation method for the thrust distribution on stabilizing pile of multi-sliding zones landslide.In this paper,the horizontal limit equilibrium method is used to analyze the multi-sliding zones landslide.According to the stress analysis under the limit equilibrium state of horizontal micro segment,the landslide thrust on stabilizing pile in each layer is obtained.When analyzing the force balance in the vertical direction,it is necessary to consider the downward force transmission of sliding mass in different layers,resulting in the sudden change of landslide thrust distribution function at the sliding zone.The thrust distribution function on stabilizing pile of multi-sliding zones landslide is derived and verified by numerical simulation,which means that the function is reliable.The thrust calculation method of multi-sliding zones landslide is proposed in this paper,which provides a certain idea for the treatment of multi-sliding zones landslide.