深海多金属硫化物力学特性的试验研究  

Experimental study of mechanical properties of seafloor massive sulfide

作　　者：刘少军[1,2,3] 胡建华 戴瑜[1,2,3] 胡琼 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]深海矿产资源开发利用技术国家重点实验室,湖南长沙410012 [3]中南大学深圳研究院,广东深圳518000

出　　处：《中南大学学报（自然科学版）》2017年第7期1750-1755,共6页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划(863计划)项目(2012AA091291);国家自然科学基金资助项目(51074179);深圳市科技创新基础研究项目(JCYJ20130401160614378;JCYJ20140506150310437)~~

摘　　要：以深海多金属硫化物自身特性为研究对象,对其样品矿物试件进行不同围压下的单/三轴破碎试验,得到深海多金属硫化物破碎全过程的应力-应变曲线,在试验数据的基础上分析矿石的破碎过程、破坏特征、适合的强度准则以及弹性模量、起裂应力和峰值强度等参数的变化规律等,研究结果表明:深海多金属硫化物矿石的破碎过程与普通岩石的破碎过程基本类似,分为OA,AB,BC,CD和DE共5个阶段,其中OA阶段往往不明显;多金属硫化物的破坏形式主要有3种,分别为横向破坏、剪切破坏和全面破坏,试件的最后破坏形式往往与施加的围压密切相关;Mohr-Coulomb强度准则更加适合判断多金属硫化物的破碎;所施加的围压越大,多金属硫化物试件的弹性模量越小;对不同的矿物试件,起裂应力和峰值强度与围压的关系是施加的围压越大,矿石的峰值强度与起裂应力之间的差值越大。Mechanical properties of deep-sea multi metal sulfide was selected as research object, the specimens were tested under different confining pressures, and stress-strain curves of seafloor massive sulfide and test data were used to analyze ore crushing process, failure characteristics, strength criterion, elastic modulus, tear strength and compressive strength. The results show that the crushing process of deep-sea poly-metallic sulfide ore is similar to general rock breaking process which can be divided into OA, AB, BC, CD and DE stage, while the OA stage is often not obvious which indicates that the porosity of ore is relatively small. There are three kinds of damaging forms of poly-metallic sulfide, such as transverse failure overall, shear failure and total failure, and failure form and confining pressure are closely related. Mohr-Coulomb criterion is more suitable for judging the broken poly-metallic sulfide. With the increase of confining pressure, the elastic modulus is gradually decreased. The relationship between stress and compressive strength and confining pressure is closely related.

关 键 词：多金属硫化物 破碎 强度准则 弹性模量 抗压强度 

分 类 号：TD857[矿业工程—金属矿开采]