高海水围压条件下多金属硫化物的破碎机理

发布时间：2018-08-29 18:20

【摘要】：为研究高海水围压条件下截齿在切削海底块状多金属硫化物(SMS)过程中的破碎机理,考虑海底块状硫化物高孔隙率、非线性的特点,选择Holmquist-Johnson-Cook(HJC)材料本构模型,基于Lagrangian有限单元法,利用LS-DYNA仿真软件建立截齿切削破碎海底块状多金属硫化物的仿真模型,模拟无海水围压下和高海水围压下海底块状多金属硫化物的切削破碎过程。研究结果表明:在高海水围压作用下,海底块状多金属硫化物的强度明显提高,断裂模式主要是脆性失效向塑性失效转变;海水黏着力和高围压作用使得切屑更难从矿体基岩剥离,截齿受到的阻力明显增大。
[Abstract]:In order to study the breaking mechanism of cutting teeth under high sea water confining pressure in the process of cutting seabed massive polymetallic sulphide (SMS), considering the characteristics of high porosity and nonlinearity of sea floor massive sulphide, the constitutive model of Holmquist-Johnson-Cook (HJC) material is selected, based on Lagrangian finite element method. LS-DYNA simulation software was used to establish a simulation model for cutting and crushing massive polymetallic sulphides in seabed. The process of cutting and breaking of massive polymetallic sulfides was simulated under no and high confining pressures of sea water. The results show that the strength of submarine massive polymetallic sulphide increases obviously under the high confining pressure of seawater, and the fracture mode is mainly brittle failure to plastic failure. The adhesion of seawater and the high confining pressure make it more difficult to strip the chip from the ore body bedrock, and the resistance of the tooth cutting is obviously increased.
【作者单位】：中南大学机电工程学院;长沙矿冶研究院深海矿产资源开发利用技术国家重点实验室;
【基金】：国家自然科学基金资助项目(51174037,51104177) 国际海域资源调查与开发“十二五”重大项目(DY125-11-R-01) 湖南省科技重大专项(2014FJ1002)~~
【分类号】：TD857

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