硬岩脆性损伤声发射特征及蠕变破坏机理研究

Study on Acoustic Emission Characteristics and Creep FailureMechanism of Brittle Damage of Hard Rock

岩石蠕变对矿山岩体力学安全性具有重要影响。开展了硬岩损伤过程中的应力应变分析及声发射矩张量反演,认识到岩石内部细观结构损伤和强度劣化是蠕变的诱因,研究了岩石的强度、弹模的时间效应及岩体自身结构微细观损累积特性,更加充分阐释了岩体作为工程介质其自身蠕变机制特征。应用细观蠕变损伤模型模拟了岩石试样在单轴载荷作用下蠕变损伤规律,研究结果可望为井巷、边坡等工程的安全设计与长期稳定性评价提供参考。

Rock creep has an important influence on the mechanical safety of mine rock mass.The stress-strain analysis and acoustic emission moment tensor inversion during the damage process of hard rock were conducted to recognize that the damage and strength deterioration of mesostructure in rock are the inducement of creep,and the time effect of strength and elastic modulus of rock and the cumulative characteristics of mesostructure loss of rock mass were studied,to fully explain the creep mechanism characteristics of rock mass as an engineering medium.The creep damage law of rock specimen under uniaxial load was simulated by using meso-creep damage model.The studied results are expected to provide reference for safety design and long-term stability evaluation of roadway and slope engineering.