浸水重力式挡土墙稳定性的最不利水位确定

Determination of the most unfavorable water level equation of the Wetted Gravity Retaining Wall

根据浸水重力式挡土墙不同墙型,采用传统逐步试算法与求极值的方法分别确定抗滑与抗倾覆稳定最不利水位计算公式,并通过算例对比验证,结果表明:墙后填料为砂性土时,浸水重力式挡土墙抗滑最不利水位一般位于墙高约2/3处,而抗倾覆最不利水位则位于墙顶处;墙后填料为粘性土时,浸水重力式挡土墙抗滑与抗倾覆最不利水位一般均位于墙顶处;一定墙前水位高程以下,水位差越大,挡土墙抗倾覆稳定性越好,而在一定墙前水位高程以上,水位差越大,挡土墙抗倾覆稳定性则越差;两种方法计算结果接近,说明求极值方法可以确定浸水重力式挡土墙最不利水位。

According to the different types of the flooding gravity retaining wall, the formula of the most unfavorable water level of resistance to slide and anti -overturning stability by traditional step -by -step algorithm and extreme value methods was respectively determined. Through comparison, the resuhs indicate that： while the wall behind filler is sandy soil, the most unfavorable water level of resistance to slide is generally located in the 2/3 of flooding gravity retaining wall, while the most unfavorable water level of anti - overturning at the top of the wall; while the wall behind filler is cohesive soil, the most unfavorable water levels of resistance to slide and resistive overturning are generally at the top of the flooding gravity retaining wall ; below a certain water level elevation at the front wall, the anti - overturning stabil- ity of the retaining wall is better when the water level difference is bigger. Above a certain water level elevation at the front wall, the anti - overturning stability of the retaining wall is worse when the water level difference is bigger; the results of the two methods are close, indicating that the extreme value method can determine the most unfavorable water level of the flooding gravity retaining wall.