Abstract
Aiming at the construction and control problems of fractured rock mass when large section inclined shaft through goaf in this paper, and with the new digging belt conveyer incline shaft at No. 6 mine of Pingdingshan as the study subject, three zones of overlying strata in goaf and stability control of surrounding rock in incline shaft was studied. According to the actual mining situation and the engineering geological conditions, the methods of empirical formula and field tracking were used to determine the height of three zones of overlying strata and the length corresponding to the new digging belt conveyer incline shaft. At the same time, the mechanical characteristics of surrounding rock in caving zone analyzed by laboratory experiment. And the compacted conditions of rock strata in goaf with the Ding5–6 coal seam was obtained through the field, so that “rigid U steel arch+ pouring concrete” supporting scheme was put forward. In addition, the mechanics principle of U steel inverted arch was analyzed by mechanical theory, which finally determined the concrete support parameters and construction scheme for surrounding rock of incline shaft in caving zone. Through field practice and late monitoring, the result shown that the stability of surrounding rock was well controlled, and surrounding rock began to stabilize and its deformation rate was less than 1 mm/d in the stable stage of monitoring.
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Acknowledgements
This study was supported by National Natural Science Foundation of China (51574122, 51434006), the Open Research Foundation of Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education(Anhui University of Science and Technology) (JYBSYS2015201) and Scientific Research Fund of Hunan Provincial Education Department (14A045). The financial supports are greatly appreciated.
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Yu, W., Wang, W., Wu, G. et al. Three Zones and Support Technique for Large Section Incline Shaft Crossing Goaf. Geotech Geol Eng 35, 1921–1931 (2017). https://doi.org/10.1007/s10706-017-0217-9
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DOI: https://doi.org/10.1007/s10706-017-0217-9