煤矿安全2025，Vol.56Issue(9)：1-15,15.DOI:10.13347/j.cnki.mkaq.20250229
单轴压缩下胶结充填体-岩石组合体的力学行为和破坏特征
Mechanical behavior and damage characteristics of cemented paste backfill-rock composite structure under uniaxial compression
摘要
Abstract
During the transition from open-pit to underground mining operations in coal mines,investigating the mechanical charac-teristics and deformation-failure mechanisms of cemented paste backfill-rock(CPB-R)composite structures holds particular signific-ance for ensuring underground stope stability and preventing rockburst disasters.Numerical simulations using the rigid body spring network(RBSN)method in PFC2D software were conducted to analyze the failure behavior of CPB-R structures with varying inter-face inclination angles under uniaxial compression.The influence of interface inclination angles on strength characteristics,failure patterns,and acoustic emission(AE)features of CPB-R composites was systematically explored from macro-meso perspectives,with experimental validation provided by laboratory uniaxial compression tests.The findings reveal that the strength of CPB-R compos-ites exhibits a"U-shaped"trend with increasing interface inclination angle,reaching the minimum peak strength at approximately 60°.When the interface inclination exceeds 30°,the yield stage of the stress-strain curve weakens and the brittle characteristics in-crease significantly.With the increase of the interface inclination,the failure mode of the CPB-R composite shows an evolution trend from"Y-shaped"failure to interface slip failure and then to mixed failure.The ultimate bearing capacity shows a transformation from being controlled by the filling body to being controlled by the interface.It then transforms into an evolutionary trend controlled by rocks.With the increase of the interface inclination angle of the CPB-R combination,the degree of interface failure keeps improv-ing.Interface damage will prevent the further sliding of the interface(interface inclination angle<60°)and lead to the occurrence of tensioning failure.The rock burst index(KE)first decreases and then increases during the process of increasing the elastic modulus ratio of the filling body to the rock.Controlling the elastic modulus ratio of the filling body to the rock within 0.4-0.5 can effectively reduce the risk of rockburst.关键词
倾斜界面/充填体-岩石组合体/破坏模式/岩爆趋势/数值模拟Key words
inclination interface/rock-backfill composite structure/failure mode/rock burst tendency/numerical simulation分类
矿业与冶金引用本文复制引用
车增辉,周子涵,辛凤阳,郝建帅,张令非,曹建,姜博文,刘梓帆..单轴压缩下胶结充填体-岩石组合体的力学行为和破坏特征[J].煤矿安全,2025,56(9):1-15,15.基金项目
国家自然科学基金资助项目(52308316) （52308316）
浙江省岩石力学与地质灾害重点实验室开放基金资助项目(ZJRMG-2022-01) （ZJRMG-2022-01）
新疆维吾尔自治区重大科技专项资助项目(2024A01002-4) （2024A01002-4）
中央高校基本科研业务费专项资金资助项目(300102265303) （300102265303）
