文献类型：期刊文献

中文题名：不同配比全尾砂胶结充填体的动态损伤特性

英文题名：Dynamic Damage Characteristics of Cementing Backfill with Different Ratio of Tailings

作者：王浩 张智宇 王建国 雷振

第一作者：王浩

机构：[1]昆明理工大学公共安全与应急管理学院,昆明650093;[2]昆明理工大学国土资源与工程学院,昆明650093;[3]云南省中-德蓝色矿山与特殊地下空间开发利用重点实验室,昆明650093;[4]贵州理工学院矿业工程学院,贵阳550000

第一机构：昆明理工大学公共安全与应急管理学院,昆明650093

年份：2021

卷号：11

期号：4

起止页码：110-117

中文期刊名：有色金属工程

外文期刊名：Nonferrous Metals Engineering

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：国家自然科学基金资助项目(51564027)。

语种：中文

中文关键词：霍普金森压杆;胶结充填体;破碎块度;损伤度

外文关键词：hopkinson pressure bar;cementing backfill;fragmentation degree;damage degree

摘要：为得到不同配比下某铜矿尾砂胶结充填体的动力学特性及损伤度,对灰砂比分别为1∶4、1∶6、1∶8和1∶10,质量浓度为72%的充填体试件开展了相似加载应变率下的常规单轴冲击试验。结果表明:1)加载应变率为30s^(-1),灰砂比为1∶4和1∶6的试件内部胶结力较强,受到冲击荷载后残余强度较高,仅在边缘处出现少量层状剥落,相同条件下灰砂比为1∶8、1∶10的试件破坏后多以粉质与劈裂柱状体的形式存在,基本丧失原有强度。2)灰砂比为1∶4、1∶6、1∶8和1∶10所对应的损伤值d分别为0.238、0.258、0.443和0.476,当灰砂比由1∶6变化为1∶8时,损伤变量值增幅达171.71%,此阶段充填体整体力学性质大幅度降低,动态抗压强度降低,动弹模量减小,但破坏应变增加,充填体变形性能趋向于脆性。
In order to obtain the dynamic characteristics and damage degree of cemented tailings backfill in a copper mine under different ratios,the conventional uniaxial impact tests were carried out on the backfill specimens with cement-sand ratios of 1∶4,1∶6,1∶8and 1∶10and mass concentration of 72%under similar loading strain rates.The test results show that:1)When the loading strain rate is 30s^(-1) and the cement-sand ratio is 1∶4and 1∶6,the internal bonding force of the specimen is strong,and the residual strength is high after the impact load.Only a small amount of layered spalling occurs at the edge.Under the same conditions,the specimens with cement-sand ratio of 1∶8and 1∶10are mostly in the form of powder and splitting columnar body after failure,and their original strength is basically lost.2)When the cement-sand ratio was 1∶4,1∶6,1∶8and 1∶10,the corresponding damage values d were 0.238,0.258,0.443and 0.476,respectively.When the cement-sand ratio changed from 1∶6to 1∶8,the damage variable value increased by 171.71%.At this stage,the overall mechanical properties of the filling body decreased significantly,the dynamic compressive strength decreased,and the dynamic elastic modulus decreased,but the failure strain increased,and the deformation performance of the filling body tended to be brittle.