重力式码头抛石基床应力分析

现行规范中,计算重力式码头抛石基床应力时假定基床是刚性的,不考虑基床前、后方的土压力,只考虑基床自重和基顶应力向下的传播。随着大型重力式码头抛石基床深度的不断加大,基床前、后方的土压力也在不断的加大,现行规范这种计算方法与实际情况就存在较大的差异。通过系统的计算、研究,分析厚抛石基床前后方土压力对基床内应力分布的影响,根据有限元软件PLAXIS计算出应力分布规律,提出了一种采用3个应力控制点的更合理的改进计算方法。

Stress distribution in rubble bed of gravity wharf

Being used to calculate the foundation stress, the method of actual criterion assumes that therubble bed is rigid. Although it refers to the weight of the rubble bed and the stress on the top, the earth pressure infront and at the back of the rubble bed are not considered. With the development of the great gravity wharf, the depthof rubble bed increases, so the earth pressure in front and at the back of the rubble bed also increases. Hence, theremust be some differences between the criterion method and the actual situation. The paper analyzes the effect of theearth pressure on the distribution of foundation stress by systemic study and calculation. According to the result ofengineering FEM program PLAXIS, a more rational method with three controlling points is put forward.