考虑土体堆积影响的环保疏浚抓斗推压阻力计算  

Calculation of Pushing Resistance of Environmental-friendly Dredging Grab Considering Excavated Soil Accumulation

作　　者：于金恒 杨启[1] 陈新权[1] 欧阳义平[1] Yu Jin-heng;Yang Qi;Chen Xin-quan;Ouyang Yi-ping(Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学,上海200240

出　　处：《海洋工程装备与技术》2020年第4期220-226,共7页Ocean Engineering Equipment and Technology

摘　　要：随着湖河环保型疏浚需求的增加,环保型疏浚装备的开发设计需求日益迫切。本文针对环保型闭式动力抓斗,开展被挖掘土体在斗内堆积引起推压阻力变化的研究。本文分析挖掘过程中的土体破坏、运动及堆积特性,将挖掘过程中土体模型的变化反映为堆积角及挡土墙长度的变化;基于极限分析方法建立了推压阻力计算改进模型,对比分析了改进模型和传统模型推压阻力计算结果;并对比分析了不同土壤特性参数下推压阻力受土体堆积影响的灵敏性。仿真结果显示,改进模型的各推压阻力结果均较传统模型有所增大,更符合实际的抓斗抓取土体破坏情况,其中黏性或容重系数较大的土壤推压阻力结果增大尤为显著。With the increase demand for environmental-friendly dredging in lakes and rivers,the demand for environmental-friendly dredging equipment was also increasingly apparent.This paper aimed at environmental-friendly closed grabs and carried out research on the changes in pushing resistance caused by the accumulation of excavated soil in the bucket.This paper analyzed the soil damage,movement and accumulation during the excavation process,and reflected the changes of the soil model as the angle of accumulation and the length of the retaining wall.The improved model for the calculation of the pushing resistance was established based on the limit analysis method and the results of pushing resistance of different methods were compared and analyzed,and the sensitivities of pushing resistance considering soil accumulation under different soil characteristic parameters were compared.The simulation results showed that the results of each pushing resistance of the improved model in this paper were larger than the traditional model and were more in line with the actual situation.Among them,the increase of pushing resistance of the soil with larger viscosity or density coefficient was particularly significant.

关 键 词：疏浚抓斗 推压阻力 堆积角 挡土墙长度 极限分析 

分 类 号：U616[交通运输工程—船舶及航道工程]