深海多金属硫化物力学特性的试验研究

发布时间：2018-04-01 03:10

本文选题：多金属硫化物　切入点：破碎　出处：《中南大学学报(自然科学版)》2017年07期

【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。
[Abstract]:Taking the characteristics of deep sea polymetallic sulphide as the research object, the uniaxial / triaxial crushing tests of the sample mineral samples under different confining pressures were carried out, and the stress-strain curves of the whole process of deep sea polymetallic sulphide breaking were obtained.On the basis of experimental data, the fracture process, failure characteristics, suitable strength criteria and the variation rules of elastic modulus, crack initiation stress and peak strength of the ore are analyzed.The results show that the fracture process of deep-sea polymetallic sulphide ores is basically similar to that of ordinary rocks, and is divided into five stages, namely OAA ABB BCU CD and DE, in which OA stage is not obvious, and there are three main failure forms of polymetallic sulphide.For transverse failure, shear failure and total failure respectively, the final failure form of the specimen is often closely related to the applied confining pressure and the Mohr-Coulomb strength criterion is more suitable for judging the fracture of polymetallic sulphides, and the larger the confining pressure is,The smaller the elastic modulus of polymetallic sulfide specimen and the greater the relationship between initial crack stress and peak strength and confining pressure for different mineral specimens, the greater the difference between peak strength and initial crack stress of ore.
【作者单位】：中南大学机电工程学院;深海矿产资源开发利用技术国家重点实验室;中南大学深圳研究院;
【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)~~
【分类号】：TD912

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