基于颗粒流理论的深海沉积物土力学特性  

Mechanical Properties of Deep Sea Sediment Soil Based on Particle Flow Theory

作　　者：李力[1,2] 孟艺敏 LI Li;MENG Yimin(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory for Development of Deep-sea Mineral Resources,Changsha 410012,China)

机构地区：[1]中南大学机电工程学院,长沙410083 [2]深海矿产资源开发国家重点实验室,长沙410012

出　　处：《船舶工程》2020年第6期119-125,共7页Ship Engineering

基　　金：国家自然科学基金面上项目(50275152)。

摘　　要：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。The shear and load bearing characteristics of deep-sea sediment are important parameters to determine the stability of deep-sea mining vehicles.With analyzing the physical and mechanical properties of deep-sea sediments,based on the particle flow code,the particle flow model of deep-sea sediments with high porosity ratio,high moisture content and long strip shape is established.The numerical simulation of cross-plate shear and static contact exploration at different depths is 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.

关 键 词：深海沉积物 颗粒流理论 剪切特性 静力触探 

分 类 号：TU458[建筑科学—岩土工程]