循环荷载作用下石灰岩动态力学响应特征与损伤演化机制

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (10) : 30-40.

冲击与爆炸

循环荷载作用下石灰岩动态力学响应特征与损伤演化机制

雷小磊，汪海波，段继超*，王梦想，吕闹

作者信息 +

Dynamic mechanical response characteristics and damage evolution mechanism of limestone under cyclic loading

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LEI Xiaolei，WANG Haibo，DUAN Jichao*，WANG Mengxiang，L Nao

Author information +

文章历史 +

摘要

为了探究循环荷载作用下石灰岩力学性能以及损伤演化机理，开展了一系列室内试验、理论分析和数值模拟。首先，对石灰岩实施了分离式霍普金森压杆（SHPB）单次与等幅循环冲击试验，并结合Weibull损伤理论构建动载损伤演化模型，并利用ANSYS/LSDYNA对石灰岩开展循环爆破数值模拟。结果显示，单次冲击作用下，冲击气压升高导致石灰岩峰值应力增大、屈服应变增加；循环冲击作用下，随着冲击气压从0.15 MPa升至0.30 MPa，试件破裂所需冲击次数逐渐减少，由13次减至3次；随着冲击次数增加，试件屈服应变增大，弹性模量、峰值应力降低，累积损伤近1时发生破坏；爆破次数增加，模型炮孔周边的粉碎区域扩大，主裂纹持续扩展，损伤不断累积。本研究定义的损伤变量实现了对循环冲击荷载作用下累积损伤演化全过程完整统一的描述，建立的爆破荷载作用下岩石损伤表达式有效揭示了单次爆破过程中岩石损伤分布特性，符合工程爆破理论体系，能够为工程爆破作业提供重要参考。

Abstract

To investigate the mechanical properties and damage evolution mechanisms of limestone under cyclic loading, a series of laboratory experiments, theoretical analyses, and numerical simulations were conducted. Initially, single and constant-amplitude cyclic impact tests on limestone were performed using the Split Hopkinson Pressure Bar (SHPB) apparatus. Based on the Weibull damage theory, a dynamic load-induced damage evolution model was developed. Additionally, numerical simulations of cyclic blasting on limestone were carried out using ANSYS/LSDYNA. The results indicate that, under a single impact, an increase in impact pressure leads to an elevation in peak stress and yield strain of the limestone. Under cyclic impacts, as the impact pressure rises from 0.15 MPa to 0.30 MPa, the number of impacts required to fracture the specimens decreases gradually, from 13 to 3. With an increasing number of impacts, the yield strain of the specimens increases, while the elastic modulus and peak stress decrease, ultimately leading to failure when the cumulative damage approaches unity. As the number of blasting events increases, the crushing zone around the blast holes in the model expands, the main cracks continue to propagate, and damage accumulates. The damage variable defined in this study achieves a comprehensive and unified description of the entire process of cumulative damage evolution under cyclic impact loading. The rock damage expression established under blasting loads effectively reveals the distribution characteristics of rock damage during a single blasting event, aligning with the theoretical framework of engineering blasting and providing valuable insights for engineering blasting operations.

导出引用

雷小磊, 汪海波, 段继超, 王梦想, 吕闹. 循环荷载作用下石灰岩动态力学响应特征与损伤演化机制[J]. 振动与冲击, 2025, 44(10): 30-40

LEI Xiaolei, WANG Haibo, DUAN Jichao, WANG Mengxiang, L Nao. Dynamic mechanical response characteristics and damage evolution mechanism of limestone under cyclic loading

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[J]. Journal of Vibration and Shock, 2025, 44(10): 30-40

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