D形软体排顺水沉排受力特性分析

Analysis of force characteristics of downstream sinking D-shaped flexible mattress

软体排沉排过程中受到移船、水流等因素的影响容易发生撕排现象。为探究顺水沉排过程中相对移船位移、水深、表面流速和布置加筋条对排布受力的影响,基于悬链线理论建立软体排数学模型,考虑流速沿水深的指数分布,开展系列数值计算。结果表明:相对移船位移对排布应力的影响最大,表面流速和水深次之;排布最大轴向和横向应力均出现在排布顶端,沿排宽方向表现为两端大、中间小的特点;布置加筋条能够显著降低排布的轴向和横向应力,防止撕排现象发生。

The sinking of flexible mattresses, due to ship movement, water flow, and other factors, is prone to tearing of the mattresses. To explore the influences of relative displacement of the ship, water depth, surface velocity, and arrangement of stiffeners on the forces on downstream sinking flexible mattresses, we build a mathematical model of flexible mattresses according to the catenary theory, and carry out a series of numerical calculations considering the exponential distribution of velocity along water depth. The results show that the relative displacement of the ship, followed by surface velocity and water depth, has the greatest influence on the stresses of flexible mattresses. The maximum axial and transverse stresses are both at the top of the flexible mattresses, and a characteristic of large tensile forces at two ends and small ones in the middle is observed along the mattress width direction. The arrangement of stiffeners can significantly reduce the axial and transverse stresses of the mattresses and thereby prevent the tearing phenomenon.