耙吸挖泥船装舱溢流过程中非黏性泥沙沉积与冲刷的模拟

自航耙吸挖泥船(TSHD)在装舱周期中,在可能的情况下需要边施工边溢流以提高有效装载量.溢流损失量受到泥舱结构、泥沙组分等多重因素的影响,很难准确预测利用CFD方法结合非黏性泥沙冲淤的经验公式,建立了TSHD超大型泥舱(21 643.8 m3)二维沉积数学模型,利用该模型对装舱溢流过程进行了模拟,对产量、溢流损失进行了预测,预测结果与以往成熟模型的结果基本一致.在此基础上,分析了装舱过程中沉积面的变化过程、不同粒径组的冲淤特点.该模型的建立,有助于实现对泥舱水力布置和装舱效率进行研究,弥补空白.

Simulation of deposition and scour of non-cohesive sediment in full loading process of TSHD

In order to improve the loading effect, overflow is preferred in TSHD dredging if possible. Due to the influences of multiple factors, such as hoper size and structure and sediment particle sizes etc., overflow loss is difficult to predict. This paper presents a 2D bi-phase model of hopper(21 643.8 m3) for non-cohesive dredging loads, based on the N-S equations, sediment equations and empirical formula of bed-load sedimentation, to simulate the full loading process of TSHD(including overflow process), and gives a good result on the forecast of such kinds of TSHD loading. This work provides a new approach to hydraulic and loading operation design of TSHD hopper.