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| Analysis and application of disturbance stress reaction mechanism of surrounding rock during sinking ultra-deep shaft |
| ZHAO Xingdong1, LI Yangyang1, ZHANG Shujing1, CHEN Yumin2, WANG Chenglong3, WANG Xi4
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1. Geomechanics Research Center, Northeastern University, Shenyang 110819, Liaoning, China;
2. Shandong Gold Group Co., Ltd., Jinan 250100, Shandong, China;
3. Yantai Mining Business Department, Shandong Gold Group Co., Ltd., Laizhou 261400, Shandong, China;
4. Deep Mining Laboratory, Shandong Gold Group Co., Ltd., Laizhou 261400, Shandong, China |
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Abstract For stability analysis of ultra-deep shaft surrounding rock, based on the elastic-plastic constitutive model and Mohr-Column failure criterion, the disturbance stress reaction process of the shaft excavation was simulated by reducing the radial support stress at the excavation boundary of shaft. The reaction mechanism of the disturbance stress was described based on the evolution of disturbance stress and failure of shaft surrounding rock, and then the results of current study on the disturbance stress mechanism of shaft longitudinal section were summarized. As the shaft goes deeper, the instability type of the new main shaft surrounding rock was divided into three categories: the structure controlling instability type, the stress controlling instability type and the transformation type from structural controlling instability to stress controlling instability. At the same time, based on the reaction mechanism of disturbance stress caused by shaft excavation and utilizing various rock failure criteria, the longitudinal instability zone was divided for the new main shaft. The calculating results showed that the structural controlling instability of shaft surrounding rock was between 0 m and 387 m, the transformation zone from structural controlling instability to stress controlling instability was between 387 m and 654.7 m, and the stress controlling instability type appeared between 654.7 m to 1 527 m.
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Published: 25 February 2021
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