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| In situ stress measurement and stress analysis of the Eastlean mine in the third mining area of Jinchuan |
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Received:April 16, 2020
Revised:April 24, 2020
Accepted:April 24, 2020
Published Online:January 29, 2021
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| DOI： |
| KeyWord:in-situ stress measurement; maximum principal stress; stress relief method of hollow inclusion; horizontal stress |
| Author | Institution |
| LIU Weidong |
No Mining District of Jinchuan group co LTD,Jinchang Gansu |
| LI Jinxin、 |
School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming Yunnan |
| SUN wei、 |
School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming Yunnan |
| ZHANG shengyou、 |
School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming Yunnan |
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| Abstract: |
| The east of Jinchuan No.3 mining area is located to the east of F17 fault, which belongs to ultrabasic poor ore. With the gradual improvement of beneficiation and smelting technology, the East lean ore in the third mining area was completed and put into operation in April 2004, which is the main mining area in the third mining area of Jinchuan. Mastering the stress state of the surrounding rock of the mine can provide an effective scientific basis for the selection of mining methods, the support and construction of the roadway and the prevention of large deformation of the roadway. The method of hollow inclusion stress relief is used to measure the in-situ stress of 1200m-1450m poor mine in the east of the third mining area. The in-situ stress data of 13 measuring points are obtained, 7 measuring points are obtained at 1200m level, and 6 measuring points are obtained at 1250m-1450m level. Based on the data, the stress state and action characteristics of the poor ore in the east of the third mining area are analyzed. The measurement results show that the maximum principal stress value of 1200m-1450m underground is 13.0-21.1mpa, which belongs to the medium stress level. The dip angle of the maximum horizontal principal stress of some measuring points exceeds 20 ° and reaches - 57 ° at most, indicating that the stress state in this area is relatively complex. The characteristics of the stress field in the mining area dominated by the horizontal stress have changed, and the trend of the horizontal stress as the dominant one is not obvious. |
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