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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。
The three-axis compression tests were carried out on three kinds of specimens, namely, the whole rock column specimen, the rock pillar-filling body specimen and the hollow rock column specimen, and the stress-strain response characteristics of different types of specimens were analyzed. The results show that: 1) The rock pillar-filler specimen can reach 69% -79% of the strength of the whole rock specimen, much more than the strength of the specimen; 2) The residual strength of the rock pillar-filler specimen Which is larger than that of the whole rock column, an increase of 16% -56%, and the residual strength of the hollow column increases more. (3) Compared with the total stress-strain curve of the rock, the total stress- The strain curve still shows a tendency of rebounding after the specimen is destroyed, which proves that the rock pillar-filling body acts as a system, interacts with each other and participates in the supporting action together and analyzes the coupling mechanism of the system. Finally, the RFPA numerical simulation of rock column - filler system under triaxial stress initiation of meso-cracks, extending to the macroscopic failure process, corroborates the correctness of the coupling mechanism between rock column and the filler system.