| Author Name | Affiliation | | Meng Wang | School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China | | Xuyang Wang | School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China | | Yuanhong Sun | North China Sea Marine Technical Support Centre，State Oceanic Administration, Qingdao 266061, Shandong, China | | Zhimin Gu | North China Sea Marine Technical Support Centre，State Oceanic Administration, Qingdao 266061, Shandong, China |
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| Abstract: |
| Shear stress-displacement relationship model of soil is very important to predict the tractive performance of tracked vehicle. Most shear stress-displacement models were proposed for terrestrial field. However, they are not suit for soft seafloor with flow surface and high water content. Based on comprehensive analysis of seafloor soil shear deformation and track segment shear tests, a new empirical model of shear stress-displacement relationship for saturated soft-plastic soil (SSP model) was proposed. To validate the SSP model and evaluate potential tractive force of self-propelled seafloor trencher, a test platform, where track segment shear test and drawbar pull test can be performed in seafloor soil substitute (bentonite water mixture), was built. Series of shear tests were carried out. Test results show that the SSP model can describe the mechanical behavior of track segment in seafloor soil substitute with good approximation. Through analyzing the main external forces, including environmental loads from seafloor soil and sea current applied to seafloor tracked trencher during the trenching process in a straight line, drawbar pull analysis model was deduced with the SSP model. A scale test model of seafloor tracked trencher was built, and the verification tests for drawbar pull analysis model were designed and carried out. Results of verification tests indicate that the drawbar pull analysis model was feasible and effective. The drawbar pull tests also indicated that the SSP model is valid from another side. |
| Key words: shear stress-displacement relationship SSP model tractive performance drawbar pull self-propelled seafloor trencher |
| DOI：10.11916/j.issn.1005-9113.15170 |
| Clc Number:P754.4 |
| Fund: |
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| Descriptions in Chinese: |
| 基于膨润土力学测试的海底自行式开沟机牵引性能分析 王 猛1，王旭阳1*，孙元宏2，谷志珉2 (1.上海交通大学 船舶海洋与建筑工程学院，上海 200240; 2.国家海洋局北海海洋技术保障中心，青岛 266061，山东） 创新点说明：（1）通过对沉积物变形特征的分析，结合履土作用剪切实验数据，总结出一种新的海底沉积物剪切经验模型“饱和软塑土剪切模型”（saturated soft-plastic soil shear stress-displacement model, SSP model）； （2）基于“饱和软塑土剪切模型”（SSP模型），结合自行式开沟机作业过程中受力情况，利用有效拖曳力推导履带切向牵引力计算公式，最终建立海底履带有效拖曳性能计算模型。 研究目的： 结合海底开沟埋缆工程需求，开展深海自行式履带开沟机的实验室预研工作，通过模型实验及理论分析，解决海底沉积物稀软表层履带开沟机的承载驱动计算与预测问题。 研究方法: （1）研究过程所用方法——文献调研、实验分析、理论推导、模型验证实验； （2）主要设备——带板综合测试台（UEST05），六分力（力/力矩）传感器（SI-475-20），数据采集模块（NET F/T 9105），履带测试带板，履带开沟机缩尺模型（SMT-T 01-05），拖曳力测试台架（UEDT05） 结果: （1）海底沉积物剪切应力-剪切位移关系模型对于自行式履带开沟机牵引性能分析及预测非常重要，目前剪切模型大多针对陆用设备所提，不适用高含水量、流塑态的海底沉积物；通过对海底沉积物剪切变形及实验的综合分析，总结出适用于沉积物的饱和软塑土剪切模型； （2）通过对典型工况海底履带开沟机的受力分析，结合饱和软塑土剪切模型，建立基于SSP模型的履带有效拖曳性能分析模型和求解方法。 结论: （1）带板剪切实验结果显示，陆用剪切模型对于黏性软塑沉积物有一定的局限性，“饱和软塑土剪切模型”（SSP model）能较好地描述带板在沉积物中的力学响应； （2）拖曳模型实验结果表明，海底沉积物中基于SSP经验模型建立的履带有效拖曳性能分析模型合理有效，这也从牵引性能角度证明“饱和软塑土剪切模型”（SSP model）对于海底沉积物可行有效。 关键词： 剪切应力-剪切位移模型;饱和软塑土剪切模型;牵引性能;拖曳力;自行式海底开沟机 |
