块系岩体准共振诱发弱夹层拉压损伤断裂研究  

Study on tensile-compression damage and fracture of weak interlayers in block rock masses induced by quasi-resonance

作　　者：王凯兴[1] 徐伟刚 潘一山[1] 薛佳琪 OPARIN V N KIRYAEVA T A WANG Kaixing;XU Weigang;PAN Yishan;XUE Jiaqi;OPARIN V N;KIRYAEVA T A(School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;Chinakal Institute of Mining,Siberian Branch,Russian Academy of Sciences,Novosibirsk 630091,Russia)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]俄罗斯科学院西伯利亚分院矿业研究所,俄罗斯新西伯利亚630091

出　　处：《岩石力学与工程学报》2025年第1期114-127,共14页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51874163,52474228);辽宁省教育厅基本科研项目(JYTMS20230809)。

摘　　要：当外界扰动频率接近块系岩体的固有频率时,会出现准共振现象。这一现象导致岩块间的弱夹层应变急剧变化,从而加快弱夹层的动态损伤断裂。为了研究块系岩体准共振导致岩块间弱夹层的动态拉压损伤断裂规律,基于块系岩体模型,分析准共振状态下弱夹层的变形特征。结合岩石动态损伤断裂准则,对准共振状态下弱夹层的动态损伤断裂进行理论计算分析,进而研究动态破坏规律。通过数值模拟揭示了准共振状态下块系岩体中弱夹层的损伤演化特征。结果表明:当块系岩体发生准共振现象时,岩块间的相对位移急剧增加,使得弱夹层的应变和损伤程度明显增大;弱夹层的损伤程度在准共振频率下最高,同时受外部扰动力和弱夹层的刚度、黏性、厚度及岩块质量等系统参数的影响;块系岩体发生准共振时断裂应力增大,但从断裂到完全破坏的时间明显缩短,即残余承载能力大幅下降。该研究对认识块系岩体的动态断裂具有一定的参考价值。When the frequency of external disturbances approaches the natural frequency of a block rock mass,a quasi-resonance phenomenon occurs.This phenomenon results in a sharp change in the strain of the weak interlayers between rock blocks,accelerating the dynamic damage and fracture of these interlayers.To investigate the dynamic tensile-compression damage and fracture patterns of weak interlayers caused by quasi-resonance in block rock masses,the deformation characteristics of weak interlayers under quasi-resonance conditions were analyzed based on a block rock mass model.Combining the rock dynamic damage fracture criteria,a theoretical and computational analysis of the dynamic damage and fracture of weak interlayers under quasi-resonance was conducted,further studying the dynamic failure patterns.Numerical simulations revealed the damage evolution characteristics of weak interlayers in block rock masses under quasi-resonance conditions.The results indicate that during quasi-resonance in block rock masses,the relative displacement between rock blocks sharply increases,significantly enhancing the strain and damage degree of the weak interlayers.The damage degree of the weak interlayers is highest at low-order quasi-resonance frequencies and is influenced by external disturbance forces and system parameters such as the stiffness,viscosity,and thickness of the weak interlayers and the mass of the rock blocks.When quasi-resonance occurs in block rock masses,the fracture stress increases,but the time from fracture to complete failure is significantly shortened,indicating a substantial decline in residual bearing capacity.This study provides a valuable reference for understanding the dynamic fracture behavior of block rock masses.

关 键 词：岩石力学 块系岩体 准共振 弱夹层变形 动态损伤断裂 

分 类 号：TU45[建筑科学—岩土工程]