【摘要】 依托某山区高速公路典型弃渣场，系统探讨山区高速公路弃渣边坡的灾变机制。利用多阶段地面调查对其渠道、拦砂坝和坡面进行定性评估，利用Phase 2D强度折减法分析其变形破坏机理，弃渣边坡沿底部淤泥质土层侧向挤出滑移，坡顶下沉、弧形裂缝和坡脚淤泥质土的隆起破坏均佐证了这一破坏模式；利用极限平衡法优化治理措施，坡脚表层淤泥质土清除宽度不小于10m,反压平台坡率为1∶2.0且高度不小于8.0m,弃渣边坡满足工程稳定性要求。山区弃渣场的中长期安全风险受场地清表、初始地面台阶整形等隐蔽条件和后期坡面整形坡度小于天然休止角等综合控制。更多还原

【Abstract】 This paper discussed the disaster mechanism of mountainous highway abandonment slope, based on a typical abandonment site of a mountainous expressway.A multi-stage ground survey was used to qualitatively assess the channel, sand arresting dam and slope surface, and the Phase2 D strength reduction method was used to analyze the deformation and damage mechanism. The lateral extrusion and slippage of the abandonment slope along the bottom silty soil layer, sinking of the slope top, arc cracks and uplift damage of the silty soil at the foot of the slope all support this damage pattern.Using the limit balance method to optimise the treatment measures, the width of the surface layer of silty soil removed at the foot of the slope is not less than 10 m, the slope rate of the counter-pressure platform is 1：2.0 and the height is not less than 8.0 m, and the abandonment slope meets the engineering stability requirements.The medium to long term safety risk of mountain abandonment sites is controlled by a combination of hidden conditions such as site clearance, initial ground step shaping and later slope shaping with slopes less than the natural angle of repose.更多还原