缓倾结构面岩体在梯度应力作用下的岩爆模型

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中图分类号：O383;O346；TD452 国标学科代码：13035；13015 文献标志码：

Model experimental investigation on the effects of rockburst on gently inclined structural planes under gradient stresses

LIN Manqing1，2，LU Xianglong1，²， XIA Yuanyou³， ZHANG Lan³，LIAO Qi1，2， YANG Tao1.2 （1. CollegeofResourcesand SafetyEngineering，Wuhan InstituteofTechnology，Wuhan43oo73，Hubei，China;

2.Engineering Research Center of Phosphorus Resources Developmentand Utilization ofMinistry of Education， Wuhan Institute of Technology，Wuhan 430o73，Hubei， China;

3.CollegeofCivilEngineeringandArchitecture，Wuhan UniversityofTechnology，Wuhan4300，HubeiCina）

Abstract：The gradient stresses in the surrounding rock caused by deep excavationand the naturally occurring slow-dipping hardstructural planesoftherockarecritical factors influencingthecharacteristicsofrockburst.Through triaxialloadingunidirectional unloading tests conducted on large-scale （ 400mm×600mm×1 000mm） ）artificial rock specimens containing prefabricated hard slow-dipping structural planes using a gas-liquid composite loading rockburst simulation system， this study systematically investigated rockburst evolution mechanisms and mechanisms of damage.A multi-modal monitoring approach incorporatingdigitalimagecoelation（DIC），acousticemission（AE）detectioninfraredthermography，andhgh-sped photographywasemployed tocapturecriticalparametersincludingenergyreleased paterns，surface infraredradiation characteristics，DIC strain field evolution，and crack propagationdynamicsduring rockburst development.Theresultsof the study show that the presence of the slow-dipping structural plane has acontrolling efect on the damage pattrn of the specimen，greatlyconstrainstheboundariesand morphologyofrockburst craters，andaccelerates theoccurrenceofrockburst.It is verifiedthatthelocationofrockbursts inthe specimens is mainlyinthe area betweenthe structural planesof thespecimens. Theinfrared radiation values and DIC strain fields in this area are much higher than those in therestof the unloading surface before the damage.As the angleof the slow-dipping structural plane increases，thepeak andcumulative acoustic emission energyof the specimen increases，the proportionofshear damage to total damage produced increaces， intensityofrockburst spawned increaces.

Keywords：rock-burst; slow-dipping structural planes;gradient stre; damagecharacteristic;acoustic emision; digital image correlation

岩爆是地下工程开挖过程中经常面临的工程灾害[，其发生由不同的物理机制控制[2]，从而产生不同的破坏特征。（剩余16948字）