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Experimental study on failure characteristics of single-sided unloading rock under different intermediate principal stress conditions

查看全文 作　　者：Chongyan [1,2]Liu;Guangming [1,2]Zhao;Wensong [1,2]Xu;Xiangrui [1,2]Meng;Zhixi [1,2]Liu;Xiang [1,3]Cheng;Gang [4]Lin 高影响力作者 机构地区：[1]State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China;[2]Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;[3]Post-Doctoral Research Station,Huaibei Mining Corporation Limited,Huaibei 235006,China;[4]Laboratoire de Géologie,Ecole Normale Supérieure,Paris 75005,France高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2023年第33卷第3期,共13页高影响力期刊 基　　金：This work was supported by the Scientific Research Project of Anhui Province Universities,China(No.YJS20210388);the National Natural Science Foundation of China(Nos.51974009,52004006,and 52004005);the Major Science and Technology Special Project of Anhui Province,China(No.202203a07020011);the Collaborative Innovation Project of Anhui Province Universities,China(No.GXXT-2021-075);the Huaibei City Science and Technology Major Program(No.Z2020005). 摘　　要：Investigation of unloading rock failure under differentσ_(2)facilitates the control mechanism of excavation surrounding rock.This study focused on single-sided unloading tests of granite specimens under true triaxial conditions.The strength and failure characteristics were studied with micro-camera and acoustic emission(AE)monitoring.Furthermore,the choice of test path and the effect ofσ_(2)on fracture of unloading rock were discussed.Results show that the increasedσ_(2)can strengthen the stability of single-sided unloading rock.After unloading,the rock’s free surface underwent five phases,namely,inoculation,particle ejection,buckling rupture,stable failure,and unstable rockburst phases.Moreover,atσ_(2)≤30 MPa,the b value shows the following variation tendency:rising,dropping,significant fluctuation,and dropping,with dispersed damages signal.Atσ_(2)≥40 MPa,the tendency shows:a rise,a decrease,a slight fluctuation,and final drop,with concentrated damages signal.After unloading,AE energy is mainly concentrated in the micro-energy range.With the increasedσ_(2),the micro-energy ratio rises.In contrast,low,medium and large energy ratios drop gradually.The increased tensile fractures and decreased shear fractures indicate that the failure mode of the unloading rock gradually changes from tensile-shear mode to tensile-split one.The fractional dimension of the rock fragments first increases and then decreases with an inflection point at 20 MPa.The distribution of SIF on the planes changes asσ_(2)increases,resulting in strengthening and then weakening of the rock bearing capacity. 关 键 词：Single-sided unloading Acoustic emission True triaxial Intermediate principal stress Stress intensity factor
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