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应用条分法计算边坡安全系数时,为方便运算,会对某些计算条件做出简化。本文以简化Bishop法作为安全系数求解方法,通过设计的比较方案,讨论了条块重心简化、地震力施加方式简化对安全系数的影响,还分析了竖向地震力施加方向的问题。研究结果表明:①条块重心简化对安全系数的影响极小,可以忽略;②地震力施加方式简化时,误差总体上随着边坡坡率变小、滑弧圆心角变大而逐渐减小,随着坡高变高、地震设计烈度变大而增大,粘聚力和内摩擦角的变化对误差基本不产生影响;③竖向地震力方向的选取主要与地震设计烈度相关,在同一地震烈度下,坡高改变了施加方向改变时的参数临界值。
When using the bar method to calculate the slope safety factor, some computational conditions are simplified for convenience. In this paper, the simplified Bishop method is used as the method to solve the safety factor. The simplified scheme is used to discuss the simplification of block center of gravity and the influence of simplified mode of seismic force on the safety factor. The problem of the direction of vertical seismic force application is also analyzed. The results show that: (1) the simplification of the center of gravity of the block has a minimal effect on the safety factor, which can be neglected. (2) When the mode of seismic force simplification is applied, the error decreases as the slope gradient decreases and the central angle of the arc increases , With the increase of slope height, the seismic design intensity becomes larger and larger, and the change of cohesion and internal friction angle has little effect on the error; ③ The selection of the vertical seismic force direction is mainly related to the seismic design intensity, Under seismic intensity, the slope height changes the critical value of the parameter when the direction of application is changed.