孔洞-裂隙缺陷岩石力学及声发射特征分析
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摘要
基于数值模拟软件PFC2D建立不同形式的缺陷岩石,探究完整岩石、含单孔洞缺陷岩石、含单裂隙缺陷岩石以及单孔洞+单裂隙缺陷岩石的力学性质及声发射特征。研究结果表明:不同缺陷岩石的力学性质不同,当岩石的缺陷面积相同时,裂隙对岩石力学性质的影响远大于孔洞的影响;与无孔洞、无裂隙的岩石声发射特征相比较,孔洞、裂隙的存在使岩石的声发射特征发生了变化,具体表现为岩石声发射的最大撞击强度、撞击峰值数目以及应变范围的变化;在相同缺陷面积条件下,单裂隙缺陷较单孔洞缺陷对于岩石声发射特征的影响更大。
Based on the PFC2 D discrete element software, different defective rocks were established firstly, and then the mechanical properties and acoustic emission characteristics of intact rocks, single hole defect rocks, single fracture defect rocks and single hole-single fracture defect rocks were explored. The research results show that the mechanical properties of the rocks with different defects are different. When the area of the defect is the same, the effect of the fracture on the mechanical properties is greater than the effect of the hole. The existence of holes and fractures has changed the characteristics of rock acoustic emission. The detailed changes are in the maximum hits strength(number), the number of hits peaks of acoustic emission, and the strain range of intensive acoustic emission hits. Besides, the effect of rocks with single fracture on acoustic emission characteristics is greater than that with single hole under the same defective area.
Based on the PFC2 D discrete element software, different defective rocks were established firstly, and then the mechanical properties and acoustic emission characteristics of intact rocks, single hole defect rocks, single fracture defect rocks and single hole-single fracture defect rocks were explored. The research results show that the mechanical properties of the rocks with different defects are different. When the area of the defect is the same, the effect of the fracture on the mechanical properties is greater than the effect of the hole. The existence of holes and fractures has changed the characteristics of rock acoustic emission. The detailed changes are in the maximum hits strength(number), the number of hits peaks of acoustic emission, and the strain range of intensive acoustic emission hits. Besides, the effect of rocks with single fracture on acoustic emission characteristics is greater than that with single hole under the same defective area.
引文
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[2] Lee H,Jeon S.An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J].Int J Solids Struct,2011,48(6):979-999.
[3] Steen B,Vervoort A,Napier J A L.Observed and simulated fracture pattern in diametrically loaded discs of rock material[J].Int J Fract,2005,131(1):35-52.
[4] Yang S Q,Jing H W,Xu T.Mechanical behavior and failure analy-sis of brittle sandstone specimens containing combined flaws under uniaxial compression[J].J Central South Univ,2014,21(5):2059-2073.
[5] 朱谭谭,靖洪文,苏海健,等.孔洞-裂隙组合型缺陷砂岩力学特性试验研究[J].煤炭学报,2015,40(7):1518-1525.
[6] Hirata A,Kameoka Y,Hirano T.Safety management based on detection of possible rock bursts by AE monitoring during tunnel excavation[J].Rock Mech Rock Eng,2007,40(6):563-576.
[7] 王晓,袁野,孟凡宝,等.加载速度对煤岩损伤演化声发射特征的影响分析[J].煤矿安全,2016,47(3):179-181,186.
[8] Cundall P A,Strack O D L.A discrete numerical model for granular assemblies[J].Géotechnique,1979,29(1):47-65.
[9] Itasca Consulting Group.PFC2D particle flow code in 2 dimensions[R].Minneapolis,USA:Itasca Consulting Group,2008.
[10] 杨圣奇,刘相如,李玉寿.单轴压缩下含孔洞裂隙砂岩力学特性试验分析[J].岩石力学与工程学报,2012,31(增刊2):3539-3546.