Experiment and particle flow simulation on mechanical properties and crack evolution mechanism of Brazilian discs containing two flaws

IF 1.6 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Yao Bai, Peng Sun, Haoyu Dou, Tiancheng Ma, Yujing Wang, Pengqian Liu
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引用次数: 0

Abstract

Abstract The mechanical behavior of fractured rock in tensile stress environment is a hot topic in underground mining engineering. Here, real surrounding rock of coal mine roadway was simulated by using rock-like materials and the tensile failure behavior of Brazilian discs with intermittent double fissures was investigated experimentally. The deformation response, fracture evolution, and failure mode of rock were analyzed. The fissured disc specimen's discrete element model was proposed in particle flow code (PFC2D). The microforce field, crack, and energy evolution processes of model specimens were discussed. The results showed that the load-displacement curves exhibit single-peak and double-peak types, corresponding to the splitting penetration and wing crack penetration damage modes of the specimen. The fissure angle or rock bridge angle showed a great influence on the evolution of main cracks and secondary cracks. The double-fissured Brazilian disc failed due to the initiation and transfer of microcracks in the stress concentration zone, combined with the continuous propagation and convergence of those microcracks. The splitting failure of the Brazilian disc is a continuous process of strain energy accumulation from the early stage of loading and instantaneous release of strain energy after obtaining the peak strength as the dissipative energy sharply rises.
含双缺陷巴西盘力学性能及裂纹演化机理的实验与颗粒流模拟
裂隙岩体在拉应力环境下的力学行为是地下采矿工程研究的热点问题。采用类岩材料模拟煤矿巷道真实围岩,对具有间歇双裂隙的巴西盘的拉伸破坏行为进行了实验研究。分析了岩石的变形响应、断裂演化和破坏模式。在颗粒流程序(PFC2D)中提出了裂隙盘试件的离散元模型。讨论了模型试样的微力场、裂纹和能量演化过程。结果表明:荷载-位移曲线表现为单峰和双峰型,对应于试件的劈裂侵彻和翼裂侵彻损伤模式;裂隙角度或岩桥角度对主裂缝和次生裂缝的演化有较大影响。双裂巴西盘破坏主要是由于应力集中区微裂纹的萌生和传递,以及微裂纹的不断扩展和收敛。巴西盘的劈裂破坏是一个从加载初期开始应变能不断积累,随着耗散能急剧上升,应变能在达到峰值强度后瞬间释放的连续过程。
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来源期刊
Journal of Geophysics and Engineering
Journal of Geophysics and Engineering 工程技术-地球化学与地球物理
CiteScore
2.50
自引率
21.40%
发文量
87
审稿时长
4 months
期刊介绍: Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.
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