- 1. 江西理工大学建筑与测绘工程学院，江西 赣州 341000
An analysis of rockburst fracture micromorphology and study of its mechanism
- 1. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
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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.