Advances in Civil Engineering / 2021 / Article / Tab 1

Research Article

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Table 1

Table of physical and mechanical parameters of coal strata.

Coal bed nameThickness (m)Bulk modulus (Pa)Shear modulus (Pa)Angle of internal friction (°)Cohesion (Pa)Tensile strength (Pa)Density (kg/m3)

Medium sandstone222.26e101.91e1037.086.20e62.48e62304
Sandy mudstone31.89e109.73e931.461.02e71.11e62503
Sandy mudstone41.89e109.73e931.461.02e71.11e62503
Medium sandstone82.73e92.31e932.548.00e61.17e62108

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