Fracture behavior of cylindrical sandstone specimens with two pre-existing flaws: experimental investigation and PFC3D simulation

被引：0
作者：
Yan-Hua Huang
Sheng-Qi Yang
Guo-Qing Chen
Bo Meng
机构：
[1] China University of Mining and Technology,State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering
[2] Chengdu University of Technology,State Key Laboratory of Geohazard Prevention and Geoenvironment Protection
来源：
Geosciences Journal | 2022年 / 26卷
关键词：
rock mechanics; crack coalescence; 3D fracture; peak strength; discrete element modelling;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
It is important to analyze the rock crack initiation, propagation and coalescence in fractured rock mass. At present, the 3D crack evolution process of pre-flawed rock has not been comprehensively studied during the deformation. In this study, uniaxial compression tests were carried out on cylindrical sandstone specimens with two pre-existing flaws with various ligament inclination angles. The crack evolution process at the front surface of the specimen was analyzed by photographic and AE monitoring. In addition, a 3D discrete element modelling was conducted to explore the spatial crack evolution behaviors during compressive loading. Both the numerical strength and final failure modes of specimens were consistent with those obtained in the laboratory experiment. The numerical simulation results revealed that the internal crack distribution was not always identical along the thickness direction. Two types of crack coalescence were identified. The experimental and numerical results enhance the understanding of 3D crack evolution mechanism of fractured rock under external loading.
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页码：151 / 165
页数：14
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