基于颗粒流理论的深海沉积物土力学特性研究

深海沉积物剪切与承载特性是决定深海采矿车行走稳定性重要参数。分析深海沉积物的物理力学性质, 基于颗粒流理论，建立了具有高孔隙比、高含水率和长条状等特性的深海沉积物颗粒流模型。开展不同深度下的十字板剪切和静力触探的数值模拟，获得了深海沉积物剪切应力-转角及贯入阻力-深度曲线，初步阐明深海沉积物剪切与贯入细观破坏机理。研究表明，深海沉积物的剪切应力-转角及贯入阻力-深度的模拟曲线与原位测试曲线吻合，验证了深海沉积物颗粒流模型及数值模拟方法的正确性。深海沉积物的剪切与贯入破坏形式主要为沉积物颗粒的挤压破坏，且应力集中于触地边缘。

Study on mechanical properties of deep sea sediment soil based on particle flow theory

The shear and load bearing characteristics of deep-sea sediment are important parameters to determine the stability of deep-sea mining vehicles. Based on the analysis of the physical and mechanical properties of deep-sea sediments and particle flow code, particle flow model of deep-sea sediments with high porosity ratio, high moisture content and long strip shape was established. Numerical simulation of cross-plate shear and static contact exploration at different depths was carried out to obtain shear stress-angle and penetration resistance-depth curves of deep-sea sediments, and to preliminarily elucidate the micro-failure mechanism of deep-sea sediments shear and penetration. The results show that the simulation curves of shear stress - rotation Angle and penetration resistance - depth of deep-sea sediments are consistent with the in-situ test curves, which verifies the correctness of the pellet flow model and numerical simulation method of deep-sea sediments. The shear and penetration failure of abyssal sediments is mainly the extrusion failure of sediment particles, and the stress is concentrated on the edge of the ground.