深海底质土-金属界面间黏附特性试验研究

基于取样于太平洋C-C矿区(Clarion-Clipperton Zone)的深海底质土，采用美国INSTRON公司生产的5943型万能材料试验机，选用4种常用的海洋金属，自制金属模具，开展黏附特性试验，研究孔隙比、法向压力和加载速度等因素对深海底质土与金属界面间黏附特性的影响规律。并基于平行圆盘分离力的计算公式，建立了深海底质土-金属界面表层土黏附指数的计算公式。研究结果表明：随着土样孔隙比的增加，黏附力呈增加的趋势，增速先快后慢，最终趋于平缓。随着法向压力的增加，深海底质土与金属界面间的表层土黏附指数呈指数函数增加趋势。随着加载速度的增加，深海底质土与金属界面间的表层土黏附指数反而呈逐渐减小的趋势。4种金属中，铝合金5052和钛合金STi80对深海底质土表层土的黏附能力较弱。该研究结果为我国深海采矿系统的安全运行提供一定的理论依据。

Experimental study of adhesion between deep-sea sediment and metal surface

Adhesion between deep-sea sediment and metal surface were studied using the deep-sea sediment collected from the Pacific C-C Zone (Clarion-Clipperton Zone), under different void ratios, normal pressures and loading speeds. A formula for calculating top soil adhesion index between deep-sea sediment and metal surface is developed based on the calculation of separating force of parallel disc. This research selects four commonly used marine metals (aluminium alloy 5052, titanium TA2, titanium alloy TC4 and titanium alloy STi80). INSTRON 5943 universal testing machine was used for the adhesion tests. The results show that the adhesion force increases with a high growth rate, as the void ratio of soil sample increases. As the normal pressure increases, the topsoil adhesion index increases exponentially. As the loading speed increases, the topsoil adhesion index decreases gradually. And the adhesion between deep-sea sediment and 5052 or STi80 are weaker. The results provide an important theoretical basis for the safe of deep-sea mining in China.