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Numerical study on static and dynamic fracture evolution around rock cavities

ISSN号：1674-7755
期刊名称：Journal of Rock Mechanics and Geotechnical Enginee
时间：2013.8
页码：262-276
分类：TU457[建筑科学—岩土工程;建筑科学—土工工程] TD821[矿业工程—煤矿开采;矿业工程—矿山开采]
作者机构：[1]ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW 2238, Australia, [2]Department of Civil Engineering, Catholic University of America, Washington, DC 20064, USA, [3]School of Transportation, Southeast University, Nanjing, China, [4]Centre for Geotechnical and Materials Modelling, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia, [5]State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221008,China, [6]School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
相关基金：granted by the National Science Foundation （NSF） under Grant CMMI-0408390 and NSF CAREER Award CMMI-0644552; the American Chemical Society Petroleum Research Foundation under Grant PRF-44468-G9; National Natural Science Foundation of China under Grant No.51050110143; granted by Huoyingdong Educational Foundation under Grant No.114024; Jiangsu Natural Science Foundation under Grant No.SBK200910046; granted by Jiangsu Postdoctoral Foundation under Grant No.0901005C
相关项目：基于可靠度的高速铁路无砟轨道结构全寿命设计理论与方法研究

关键词：数值模拟, 裂隙演化, 静态, 岩洞, 岩石破裂过程, 拉伸波, 侧压力系数, 数字代码, Cracks Dynamic loading Numerical simulations Acoustic emission（AE） Heterogeneity

中文摘要：

In this paper,a numerical code,RFPA2D(rock failure process analysis),was used to simulate the initiation and propagation of fractures around a pre-existing single cavity and multiple cavities in brittle rocks.Both static and dynamic loads were applied to the rock specimens to investigate the mechanism of fracture evolution around the cavities for different lateral pressure coefficients.In addition,characteristics of acoustic emission(AE) associated with fracture evolution were simulated.Finally,the evolution and interaction of fractures between multiple cavities were investigated with consideration of stress redistribution and transference in compressive and tensile stress fields.The numerically simulated results reproduced primary tensile,remote,and shear crack fractures,which are in agreement with the experimental results.Moreover,numerical results suggested that both compressive and tensile waves could influence the propagation of tensile cracks;in particular,the reflected tensile wave accelerated the propagation of tensile cracks.

英文摘要：

In this paper,a numerical code,RFPA2D（rock failure process analysis）,was used to simulate the initiation and propagation of fractures around a pre-existing single cavity and multiple cavities in brittle rocks.Both static and dynamic loads were applied to the rock specimens to investigate the mechanism of fracture evolution around the cavities for different lateral pressure coefficients.In addition,characteristics of acoustic emission（AE） associated with fracture evolution were simulated.Finally,the evolution and interaction of fractures between multiple cavities were investigated with consideration of stress redistribution and transference in compressive and tensile stress fields.The numerically simulated results reproduced primary tensile,remote,and shear crack fractures,which are in agreement with the experimental results.Moreover,numerical results suggested that both compressive and tensile waves could influence the propagation of tensile cracks;in particular,the reflected tensile wave accelerated the propagation of tensile cracks.

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