Abstract

The deep-sea sediments are usually heterogeneous due to overburden pressure. Excessive deformation of deep-sea sediments caused by mining collector vibration can decrease the stability and reduce the efficiency of the mining system. This study analyzed the dynamic response of the heterogeneous deep-sea sediments under mining collector vibration. First, experiments were conducted to confirm the heterogeneity of deep-sea sediments, and to reveal the relationship that the elastic modulus increases nonlinearly with depth. After that, by predigesting the mining collector vibration to in situ harmonic load, the wave equations were built for solving the dynamic response of deep-sea sediments with nonlinear modulus to mining collector loading. The solution of the equations was verified by comparing it with existing analytical solutions for a homogeneous medium. Based on the verified wave equations, further discussion was conducted on the effects of changing vibration frequency or loading amplitude on the mechanical response of deep-sea sediments. The results indicate that the soil deformation was increased but later decreased with the increase of vibration frequency, and soil deformation increased with the increase of loading amplitude. This study can provide a theoretical rationale for improving the walking efficiency of the mining collector.

摘要

由于上覆压力，深海沉积物通常是非均质的。采矿集热器振动引起的深海沉积物过度变形会降低稳定性并降低采矿系统的效率。本研究分析了异质深海沉积物在采矿集热器振动下的动态响应。首先，通过实验证实了深海沉积物的非均质性，并揭示了弹性模量随深度非线性增加的关系。之后，通过将采矿集热器振动预消化到原位为求解具有非线性模量的深海沉积物对采矿集热器载荷的动态响应，建立了波动方程。通过将方程的解与均匀介质的现有解析解进行比较来验证方程的解。基于验证的波动方程，进一步讨论了改变振动频率或加载幅度对深海沉积物力学响应的影响。结果表明，随着振动频率的增加，土体变形先增大后减小，随加载幅值的增加土体变形增大。本研究可为提高采煤机行走效率提供理论依据。