对称X型裂隙类岩体的力学特性及破坏机制研究  

Experimental Study on Mechanical Properties and Failure Mechanism ofSymmetrical X-Type Fractured Rock Mass

作　　者：邹前进 付玉华[1,2] 王观石 管华栋 佘炜杰[1] 廖俊钰 ZOU Qianjin;FU Yuhua;WANG Guanshi;GUAN Huadong;SHE Weijie;LIAO Junyu(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Gannan University of Science and Technology,Ganzhou 341000,China;School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]赣南科技学院,江西赣州341000 [3]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《有色金属工程》2023年第8期110-119,共10页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51464015);江西省教育厅科学技术研究资助项目(GJJ190499)。

摘　　要：为了研究对称X型裂隙对岩石力学特性及破坏机制的影响,对预制对称X型裂隙类岩体试件进行单轴压缩试验和数值模拟分析。结果表明:1)预制裂隙角度影响裂隙尖端的受力状态,是试件裂纹起裂特征和破坏模式的主要因素;2)对比完整试件,裂隙试件的应力-应变曲线峰前出现应力下降现象,峰后表现为延性下降,且峰值强度、弹性模量和弹性应变能明显下降,表明试件的力学特性和能量特征对预制裂隙的敏感性高;3)当0°<α<90°时,随着预制裂隙角度α的增大,Ke和T应力值减小,裂纹尖端抵抗开裂的能力增强,裂隙试件峰值应力增大,且裂尖抵抗Ⅰ和Ⅱ型断裂能力的强弱是造成裂隙试件破坏模式差异的主要原因。In order to study the influence of symmetric X-type fracture on rock mechanical properties and failure mechanism,uniaxial compression test and numerical simulation analysis were carried out on prefabricated symmetric X-type fracture rock mass specimens,and the results showed that:1)The prefabricated crack angle affects the stress state of crack tip and is the main factor of crack initiation characteristics and failure mode;2)Comparing with the intact specimens,the stress-strain curve of the cracked specimens showed stress drop phenomenon before the peak and ductility drop after the peak,and the peak strength,elastic modulus and elastic strain energy decreased significantly,indicating that the mechanical properties and energy characteristics of the specimens are highly sensitive to prefabricated cracks;3)When 0°<α<90°,as the prefabricated crack angleαincreases,the Ke and T stress values decrease,the crack tip resistance to cracking increases,the peak stress of the crack specimen increases,and the strength of the crack tip resistance to typeⅠandⅡfracture is the reason for the difference in the damage pattern of the crack specimen.

关 键 词：交叉裂隙 裂纹演化 强度变形特征 能量特征 断裂破坏准则 

分 类 号：TD315[矿业工程—矿井建设]