Analysis on Influence of Sandstone Layer Number in Overburden Strata upon Mining Subsidence and Its Numerical Simulation
SONG Shijie
ZHAO Xiaoguang
WANG Shuangming
ZHAO Lu
Abstract：The layered structure of overburden strata of coal measures is a remarkable geological characteristic of coal occurrence, but its influence on the occurrence and development process of mining subsidence has been neglected. Based on the geological characteristic of 2-2 coal seam and the representative drilling in the Yushen Coal Mining Area and under conditions of the same depth and bedrock thickness, 18 simplified models with different types of layered structure of overburden strata were constructed by taking the number of sandstone layers, their average thickness and the sand-shale ratio as variables. From the angle of comparability, a new concept named “sandstone layer coefficient” that can directly reflect the characteristic of layered structure was proposed in this paper. On this basis, study was made on the influence rule of the sandstone layer coefficient upon the subsidence coefficient under the condition of the fixed sand-shale ratio through the structural mechanics analysis and numerical simulation test, and the quantitative relationship between them was constituted. Finally, the practical guiding significance of the sandstone layer number and the sand-shale ratio in the overburden strata for the coal mining and mining subsidence prevention was expounded.
Keywords：sandstonesandstone layer coefficientmining subsidencenumerical simulationinfluence rule
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 9-12,16 )