挡土墙稳定性安全系数与可靠度指标的关系

Relationship between safety factor and reliability index of retaining wall's stability

寻找重力式挡土墙抗倾覆稳定性安全系数和抗滑移稳定性安全系数与对应可靠度指标的关系.针对甘肃某粘土边坡设计36种不同截面尺寸的挡土墙,利用MATLAB程序分别计算每种挡土墙的安全系数和可靠度指标,可靠度指标的计算方法为一次二阶矩法中的验算点法.分别绘制抗倾覆稳定性安全系数和抗滑移稳定性安全系数与可靠度指标的关系曲线图,可以看出可靠度指标随着对应安全系数的增大而增大.

The relationship between the safety factor of anti-toppling and anti-sliding stability and its corresponding reliability index of the gravity retaining wall was determined. 36 types of retaining walls with different section dimensions were designed for a cohesive soil slope in Gansu province. The safety factor and reliability index of these retaining walls were computed with MATLAB software. The design point method in the linear second-order-moment theory for structural reliability analysis was taken as the computative method for reliability index. The curves representing the relationship between safety factor for antioverturn and anti-slide and the reliability index was plotted. It was shown by the figures that the reliability index increased with its corresponding safety factor.