抗滑挡墙加固小型滑坡墙背推力研究

Study on the Back Thrust of a Small Landslide Wall Reinforced by a Slip-resistant Retaining Wall

以西南山区某小型村寨滑坡为对象,采用数值模拟方法,研究抗滑挡墙墙背滑坡推力的分布形式,并引入正交试验,采用极差分析法探讨多物理参数对滑坡推力的影响。结果表明:抗滑挡墙墙背滑坡推力的分布曲线为“鼓肚形”,在靠近坡面一定范围内滑坡推力趋于零;滑带黏聚力、内摩擦角的折减系数及抗滑挡墙埋深对滑坡推力的影响较大;抗滑挡墙埋深对作用点高度的影响较大;滑坡推力作用点介于挡墙底部向上垂直高度20%~29%的位置,与刚体极限平衡法中的假设存在偏差。

Relying on the small landslide in the southwest mountainous area as the object,using numerical simulation methods,the impact of multi-physical parameters on the landslide thrust is explored by the introduction of orthogonal tests and the use of range analysis method.The results show that:the distribution curve of landslide thrust after the wall of anti-slip retaining wall is"bulging belly",and the landslide thrust tends to be 0 within a certain range near the slope surface.The folding coefficient of the cohesion of the slip belt and the angle of internal friction and the depth of the anti-slip retaining wall have a greater influence on the size of landslide thrust.The depth of the anti-slip retaining wall has a greater influence on the height of the action point.The point of action of the landslide thrust is between 20%-29%of the upward vertical height of the bottom of the retaining wall,which is a deviation from the assumption in the rigid-body limit equilibrium method.