Advances in Civil Engineering / 2021 / Article / Tab 4

Research Article

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

Table 4

Table of physical and mechanical parameters of coal strata.

Coal bed nameThick (m)Bulk modulus (GPa)Shear modulus (GPa)Internal friction (°)Cohesion (MPa)Tensile strength (MPa)Apparent density (kg/m3)

Medium sandstone2222.619.
Sandy mudstone318.99.7331.4610.21.112503
Sandy mudstone418.99.7331.4610.21.112503
Medium sandstone82.732.3132.548.001.172108

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