This paper aims to present an associated methodology to evaluate the initial stress of coal-rock masses in steeply inclined coal seams.
On the basis of the real-time monitoring data in the field, the corresponding analytical analysis is carried out in consideration of the characteristics of topography and geology, so as to deduce the value of the initial stress in the study area and also give the analytical model of the initial stress field.
The authors identified feasibility of the initial stress level of coal-rock masses in steeply inclined coal seams, and revealed that exact acquisition on the displacement of surrounding rock was feasible to analyze the initial stress level of coal-rock masses by the back analytical method in the steeply inclined coal seams as a two-dimensional plane problem.
The calculation results including vertical stress, minimum horizontal principal stress and shearing stress were 7.057, 8.085 and 0.057 MPa, respectively. The KJ743 coal mine initial stress monitoring system was used to collect real-time initial stress data, which were used to check the accuracy of the analytical back results. The value of the vertical stress varied from 6.8 to 7.0 MPa, which is slightly smaller than the result of the back calculation. The minimum principal horizontal stress varied from 7.6 to 8.4 MPa, which is similar to the result of the back calculation.
Financial support for this work was provided by the National Natural Science Foundation of China (No. 51904227), the 973 Key National Basic Research Program of China (No. 2015CB251602), the Natural Science Foundation of Shaanxi Province (No. 2018JQ5194), the China Postdoctoral Science Foundation (No. 2017M623328XB), the Science and Technology Innovation Team Project of Shaanxi Province (No. 2018TD-038), the Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining and Metallurgy and Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment Technology (No. 2018YKZX2001) and the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China (No. 2019KFY25). Support from these agencies is gratefully acknowledged.
Author Contributions: S.P. proposed the innovative points and conceived the study. Besides, S.P. wrote the paper and L.X. revised the paper.
Conflicts of Interest: The authors declare no conflict of interest.
Shan, P. and Lai, X. (2020), "An associated evaluation methodology of initial stress level of coal-rock masses in steeply inclined coal seams, Urumchi coal field, China", Engineering Computations, Vol. 37 No. 6, pp. 2177-2192. https://doi.org/10.1108/EC-07-2019-0325Download as .RIS
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