三轴作用下岩柱-充填体试件耦合作用机理研究  

Coupling mechanism of rock-backfill system under triaxial compression

作　　者：宋卫东[1,2] 朱鹏瑞[1,2] 戚伟[1,2] 唐亚男[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点试验室,北京100083

出　　处：《采矿与安全工程学报》2017年第3期573-579,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51374033);博士点基金项目(20120006110022)

摘　　要：通过对全岩柱试件、岩柱-充填体试件、中空岩柱试件3种不同类型试件进行三轴压缩试验,分析不同类型试件的应力-应变响应特征。结果表明:1)岩柱-充填体试件可达到全岩柱试件强度的69%~79%,更远大于中空岩柱试件的强度;2)岩柱-充填体试件的残余强度均大于全岩柱试件,增幅为16%~56%,对比中空岩柱残余强度增幅更多;3)相较于岩石的全应力-应变曲线,岩柱-充填体试件的全应力-应变曲线在试件破坏后仍有一段回升趋势,证明岩柱-充填体作为一个系统,相互影响,共同参与支护作用,并分析了系统的耦合作用机理。最后利用RFPA数值模拟岩柱-充填体系统在三轴应力下细观裂隙的萌生、扩展至宏观贯通的破坏过程,佐证了岩柱-充填体系统耦合作用机理的正确性。Tests were carded out on three different types of specimens of rock pillar, rock-backfill pillar, and hollow rock pillar under triaxial compression, and the stress-strain response characteristics of different specimens were analyzed. Results have shown that 1） the rock-backfill specimen can reach of 69%-79% of the strength of the rock pillar specimen, which is far greater than the strength of hollow rock Pillar; 2） The residual strength of rock-backfill pillar specimen is larger than that of the rock pillar specimen, and the increase is 16%-56%. Compared against the residual strength of hollow rock pillar specimen, the increase is bigger; 3） Compared against the complete stress-strain curve of rock, the com- plete stress-strain curve of rock-backfill pillar specimen still has an upward trend after the failure of the specimen, which proves that the rock-backfill participates in supporting together as a system, and the coupling mechanism of the rock-backfill system was analyzed. Finally, the rock-backfill system destruction course of the initiation of micro-cracks, extension to the macroscopic, and transfixion under triaxial compression was simulated through RFPA. It supports the correctness of rock-backfill systemcoupling mechanism.

关 键 词：岩柱-充填体 三轴压缩 全应力-应变 耦合作用 RFPA 

分 类 号：TD853[矿业工程—金属矿开采]