Based on laboratory tests on the silty sand in Guangdong, we researched on the permeability, deformation and strength of the silty sand, and discussed its stress-strain relationship and parameters of Duncan model. Results caused by inadequate direct navigation performance. It was found that electric motor system largely affected the direct navigation performance of ship model. Better synchronization performance of the motor system reduced the differences between two motors on parallel circuit and improved the direct navigation performance. By changing the motors of propulsion system and the materials and fixation of balances, together with improving the mode of transmission connection, the balance rudder angle decreased by 2° ~3° compared with the original scheme. The direct navigation performance was improved, and the accuracy was guaranteed. The improvement measures could be referential for similar ship model tests.%选取广东粉土质砂(SM)为研究对象,在一系列室内试验基础上,研究该土的渗透、变形和强度等力学特性,并探讨粉土质砂的应力应变关系和邓肯模型参数.试验成果表明:粉土质砂在压实和胶结程度高的条件下,其渗透性较低,压缩性中等,抗剪强度极高；其应力-应变关系表现有明显峰值和应变软化特征,在剪应力作用下土体开始表现为剪缩特性,当变形达到一定值后,表现出剪胀特性；此外,土体的本构关系能较好地采用邓肯模型来反映.研究结果为解决粉土质砂的工程问题提供了很好的基础和依据.
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