| 孔洞-裂隙缺陷岩石力学及声发射特征分析 |
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| 作者姓名： | 郝燕奎 聂鑫 |
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| 作者单位： | 1.中煤地质集团有限公司,北京 100040; 2.太原理工大学矿业工程学院,太原 030024 |
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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。
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| 关 键 词： | 离散元 缺陷岩石 孔洞 裂隙 力学性质 声发射特征 |
| 收稿时间： | 2018-11-09 |
Analysis of mechanical and acoustic emission characteristics of hole-fracture defective rocks |
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| Authors: | HAO Yankui NIE Xin |
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| Institution: | 1. China Coal Geology Group Co., Ltd, Beijing 100040, China; 2. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | Based on the PFC2D 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. |
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| Keywords: | discrete element defective rock hole fracture mechanical property acoustic emission characteristics |
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