Experimental and measured research on three-dimensional deformation law of gas drainage borehole in coal seam
| Autor: | Tao Wang, Li Jinyu, Hui Cheng, Hongbao Zhao, Liu Yihong, Yikuo Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Strain (chemistry) Gas drainage borehole 0211 other engineering and technologies Borehole Energy Engineering and Power Technology 02 engineering and technology Three-dimensional deformation law Geotechnical Engineering and Engineering Geology Overburden pressure Instability 020401 chemical engineering Geochemistry and Petrology Horizontal position representation Strain-time curve Geotechnical engineering 0204 chemical engineering Deformation (engineering) Dynamic monitoring lcsh:Mining engineering. Metallurgy Geology Body orifice 021101 geological & geomatics engineering Stress concentration |
| Zdroj: | International Journal of Mining Science and Technology, Vol 30, Iss 3, Pp 397-403 (2020) |
| ISSN: | 2095-2686 |
| Popis: | Using self-researched gas drainage borehole stability dynamic monitoring device, three-dimensional deformation characteristics of borehole under steady vertical load were researched experimentally and systematically. This research indicated that under the action of steady loading, the mechanical deformation path of the simulated gas drainage borehole is gradually complicated, and the decay of the borehole circumferential strain is an important characterization of the prediction and early warning of borehole instability and collapse. The horizontal position of borehole occurs compressive strain, and the vertical of which occurs tensile strain under the action of vertical stress. At the initial stage of loading, the vertical strain is more sensitive than that in the horizontal direction. After a certain period of time, the horizontal strain is gradually higher than the vertical one, and the intersection of the borehole horizontal diameter and the hole wall is the stress concentration point. With the increase of the depth of hole, the strain shows a gradual decay trend as a whole, and the vertical strain decays more observably, but there is no absolute position correlation between the amount of strain decay and the increase in borehole depth, and the area within 1.5 times the orifice size is the borehole stress concentration zone. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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