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基于拟静力法,结合塑性极限分析上限定理和强度折减技术,推导了桩板式挡墙与二级锚杆挡墙支护高边坡地震作用下的水平屈服加速度系数的上限解,分别计算了多级支护结构总高度、边坡平台宽度、土的抗剪强度折减系数、桩板墙桩侧土压力分布经验系数、锚杆挡墙倾角、锚杆轴力及倾角等因素下,多级支护边坡的水平屈服加速度系数的临界极限值。根据正交分析法,给出了地震条件下基覆边坡水平屈服加速度系数影响因素的敏感性顺序。研究表明,多级支挡结构高度和锚杆轴力敏感性较大,而锚杆倾角、桩侧土压力分布经验系数和边坡平台宽度的敏感性较小。锚杆倾角、锚杆挡墙倾角、边坡平台宽度、桩板墙抗力及桩侧土压力分布形式的选择等,对水平屈服加速度系数的影响较小。土的抗剪强度参数中,黏聚力对水平屈服加速度系数的影响较小,而内摩擦角的影响较大。
Based on the quasi-static method and the upper limit theorem of plasticity limit analysis and the strength reduction technique, the upper bound solutions of the horizontal yield coefficient of acceleration under the action of the pile-plate retaining wall and the secondary anchor retaining wall with high slope are derived. Under the factors of the total height of multi-level support structure, the width of slope platform, the reduction coefficient of shear strength of soil, the empirical coefficient of earth pressure distribution on pile wall, the inclination of anchor retaining wall, the axial force and inclination angle of anchor rod, Critical Limit of Horizontal Yield Acceleration Coefficient of Multi - grade Supporting Slope. According to the orthogonal analysis method, the sensitivity sequence of factors affecting the yield factor of subgrade overburden under earthquake conditions is given. The research shows that the height of multistage retaining structures and the axial force of the anchor are sensitive, while the sensitivity of anchor inclination, the empirical coefficient of earth pressure distribution and the width of the platform are small. Anchor inclination, anchor retaining wall inclination, platform width, pile wall resistance and earth pressure on the side of the distribution of the form of choice, the horizontal yield acceleration coefficient less. In the shear strength parameters of soil, cohesion has little influence on the horizontal yield acceleration coefficient, but the influence of internal friction angle is larger.