边坡稳定性分析中超载系数法的改进
首发时间:2019-02-18
摘要:边坡稳定性分析中,现有超载系数法在加大边坡下滑力的同时,也加大了边坡的抗滑力,其本质相当于仅折减土体黏聚力的强度折减法。对于无粘性土,现有超载系数法无法求解边坡稳定系数。提出了一种改进的超载系数法,通过加大重力加速度进行超载,同时对土体内摩擦角进行折减,使边坡在抗滑力维持不变的情况加大下滑力。其本质是通过超载,使边坡在原有土体强度状态下达到极限平衡状态,新方法在与边坡稳定系数原始定义等价的同时,避免了对土体黏聚力和内摩擦角的等比例折减。
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Improvement of the Overload Factor Method in Slope Stability Analysis
Abstract:In the stability analysis of slope, the sliding force of the slope and the anti-sliding force of the slope be raised simultaneously with the existing overload factor method, which is essentially equivalent to the strength reduction method which only reduces the cohesion of the soil, and the stability factor even can not be solved for cohesionless soil slop. An improved overload factor method is proposed. By increasing the acceleration of gravity to overload and reducing the friction angle of soil, the sliding resistance of slope remains unchanged and the sliding force increases. The essence of the new method is to make the slope reach the ultimate equilibrium state under the original strength state by overloading. The improved method is equivalent to the original definition of slope stability factor, and avoids the equal proportion reduction of cohesion and friction angle of soil material.
Keywords: Slope Stability Overload factor method Strength reduction method
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