按强度控制疏浚淤泥堆场围堰稳定性的设计方法

现行规范关于疏浚淤泥堆场围堰稳定性的规定不明确,通过对不同工况下疏浚淤泥堆场围堰的稳定性分析发现,围堰的稳定性主要取决于整体抗滑稳定性和基底压应力最大值与最小值的比值,而围堰的抗倾覆稳定性和基底面抗滑稳定性可以忽略。基于疏浚淤泥堆场围堰整体抗滑稳定性验算过程中围堰坡比与筑堰材料强度之间的对应关系,提出按强度控制疏浚淤泥堆场围堰稳定性的设计方法,即在围堰基底压应力最大值与最小值的比值满足稳定性要求的前提下,以满足围堰整体抗滑稳定性最低要求的筑堰材料强度值作为围堰稳定性的控制条件,并验证了该方法的可行性。

Stability design method for cofferdam of dredged silt stock yard with shear strength control

In the current specifications,the stability design of a cofferdam of dredged silt stock yard is still not clearly defined.In this study,a new stability design method with shear strength control of the cofferdam materials is proposed.The stability calculation results under different conditions indicate that the stability of the cofferdam is mainly determined by the slope stability and the ratio of the maximum to the minimum foundation stress.The overturning stability and cofferdam bottom sliding stability have less effect on the stability of the cofferdam and can be ignored.Based on the relationship between the slope ratio and material strength of the cofferdam,the stability design method adopts shear strength control: with the precondition that the ratio of the maximum to the minimum foundation stress meets the stability demands,the material strength for the lowest anti-slip stability demand is taken as the control condition.A series of calculations validated the method.