基于损伤力学模型胶结尾砂充填体强度特性研究  

Research on Strength Characteristics of Cemented Backfills Based on Damage Mechanics Model

作　　者：马舒琪 吕淑然[1] 梁维 黄刚[3] MA Shuqi;LV Shuran;LIANG Wei;HUANG Gang(School of Safety and Environmental Engineering,Capital University of Economics and Business,Beijing 100083,China;Institute o￡Mining Engineering,Guizhou Institute of Technology,Guiyang,Guizhou 430070,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]首都经济贸易大学安全与环境工程学院,北京100070 [2]贵州理工学院矿业工程学院,贵州贵阳550003 [3]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《矿业研究与开发》2019年第8期101-105,共5页Mining Research and Development

基　　金：2018年安全生产重特大事故防治关键技术科技项目(beijing-0012-2018AQ);贵州省博士基金资助项目(黔科合基础[2017]1077)

摘　　要：以地下矿山尾砂充填料为研究对象,利用充填体试块损伤力学模型和岩石力学试验机对胶结尾砂充填体在不同质量浓度、灰砂比和养护时间下的强度特性进行试验研究。引入充填体损伤力学模型和损伤因子来描述胶结尾砂充填体的强度特性和破坏过程。研究结果表明:充填体的单轴抗压强度随着质量浓度、灰砂比和养护时间的增加而增大,并且灰砂比和养护时间对充填体强度影响较大;结合试验结果,利用充填体损伤力学模型可以准确地描述充填体加载过程中的应力-应变曲线;结合应力-应变曲线得出的损伤因子值随应变增加而增大,且质量浓度和灰砂比越大、养护时间越长,损伤因子值越小,充填体越不容易破坏。Taking cemented backfill material of underground mine as the study object,the research on strength characteristics of cemented tailings backfill under different mass concentration,cement-sand ratio and curing time were carried out by using damage mechanics model of backfill test block and mechanics testing machine.In addition,the damage mechanics model and damage factor were introduced to describe the strength characteristics and destruction process of the backfill.The results showed that the uniaxial compressive strength of backfill increased with the mass concentration,cement-sand ratio and curing time,and especially the cement-sand ratio and curing time had a great influence on the strength of backfill.Combined with the test results,the stress-strain curves during the loading process of backfill can be accurately described by the damage mechanics model.The damage factor value obtained by combining the stress-strain curve increased with the increase of strain.The larger the mass concentration and the cement-sand ratio,as well as the longer the curing time,the smaller the damage factor value and the less possibility the backfill to be destroyed.

关 键 词：胶结尾砂 损伤力学模型 损伤因子 单轴抗压强度 

分 类 号：TD853.343[矿业工程—金属矿开采]