An analysis of rockburst fracture micromorphology and study of its mechanism

Zhao Kang; Zhao Hong-yu; Jia Qun-yan

doi:10.11883/1001-1455(2015)06-0913-06

Volume 35 Issue 6

Nov. 2015

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Zhao Kang, Zhao Hong-yu, Jia Qun-yan. An analysis of rockburst fracture micromorphology and study of its mechanism[J]. Explosion And Shock Waves, 2015, 35(6): 913-918. doi: 10.11883/1001-1455(2015)06-0913-06

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Zhao Kang, Zhao Hong-yu, Jia Qun-yan. An analysis of rockburst fracture micromorphology and study of its mechanism[J]. Explosion And Shock Waves, 2015, 35(6): 913-918. doi: 10.11883/1001-1455(2015)06-0913-06

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An analysis of rockburst fracture micromorphology and study of its mechanism

doi: 10.11883/1001-1455(2015)06-0913-06

School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

Received Date: 2014-04-17
Rev Recd Date: 2014-06-11
Publish Date: 2015-12-10

Abstract

Abstract

The micromorphological characteristics of rock failure surface by rockburst are analyzed and studied with the scanning electron microscope to explore the rockburst mechanism. The relation between rock failure surface morphology with stress and rock constituent is studied with rock samples from the rockburst site of the 12th Pingdingshan Mine. The results show the rock failure surface of surrounding rock of roadway presents a step-like shape, and the split surface is parallel to the orientation of the maximum principal stress of in-situ stress; the rock failure surface belongs to a draw-stretch fracture, where the crack is brittle. The rock failure surface morphology with rockburst casting is very complicated, and the broken face is parallel to or intersected with the direction of the shear stress (maximum principal stress). The microcrack on different planes form steps with those among rockburst cracks or under tearing effect, with uneven surfaces, which can be defined as stretch-draw or shearing fracture. Rock micro-components have a greater effect on rockburst, and the rockburst occurs more likely for the compact and brittle rock with a high crystalline degree.
- mechanics of explosion,
- micromorphology,
- scanning electron microscope,
- rockburst,
- rock failure surface,
- in-situ stress,
- rock composition

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感谢河南理工大学苏承东教授、刘建辉硕士, 东北石油大学夏法锋教授在地应力测量及电镜扫描中给予的帮助。

References(14)

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