The damage evolution mechanism of stratified surrounding rocks in deep tunnels is of great significance for disaster early warning. To investigate this mechanism,MatDEM software was employed to construct numerical models that simulate the overloading failure of rock samples under different deep stress conditions. Numerical analysis was conducted on the damage evolution process during mechanical overloading. From three aspects—triaxial stress response characteristics,fracture propagation patterns,and velocity field distribution related to rockburst—the influences of structural effects and confining pressure effects were systematically examined. The results demonstrate that the primary failure consistently initiates at the regions with maximum stress concentration. The fracture evolution process is found to effectively distinguish between tensile cracks and shear cracks. The research results provide a theoretical basis for the process control and short-term warning of collapse disasters in deep-buried tunnel engineering.
WANG Gang, LI Xiao-shun, WANG Ji-lin, JIANG Ting, HE Peng, XU Yi-fan, ZHENG Cheng-cheng.
Evolution Mechanism of Overload Damage and Failure in Layered Rock Masses in Deep Tunnels Based on MatDEM[J].
Science Technology and Engineering, 2026, 26(4): 1688-1699 DOI:10.12404/j.issn.1671-1815.2501887
岩土体在宏观层面表现为相对连续的结构,但在微观层面,它由颗粒、孔隙和裂隙组成,表现出显著的离散和不连续性,因此,难以仅用基于连续介质力学的常规方法解决,且大尺度工程模型运算效率较低,难以满足工程需求。在离散单元法(discrete element method,DEM)中,岩土体是通过颗粒的堆积和胶结过程形成的。离散元法可以有效地模拟多尺度特征,并被广泛用于研究岩土体宏观力学性质的微观基础。现运用矩阵离散元模拟软件(fast GPU matrix computing of discrete element method,MatDEM),建立岩样的离散元分析模型,快速模拟高地应力下的层状围岩隧道的超载破坏过程,研究不同层面倾角含预制圆形孔洞岩体在不同初始应力情况下的破坏规律,旨在揭示层状岩体超载破坏机制,为灾害预警与支护优化提供理论支撑。
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