煤矸石抗剪强度特性试验对比研究

doi:10.13722/j.cnki.jrme.2014.0303

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Abstract In order to analysis the mechanical characteristic differences of coal gangue abandoned in different periods，based on the on-site gradation，the direct shear tests of consolidation coal gangue and fresh coal gangue with different moisture content are carried out. The test results indicate that different from the fresh gangue，the consolidation gangue has shown obvious bonding characteristic with the increase of moisture content. The stress-strain relationship also is gradually change into the strain hardening of high moisture content from the strain softening of low moisture content. The influence of dry density and moisture content of gangue specimen to the shear strength parameters is different to the consolidation coal gangue and to fresh coal gangue. The dry density has more significant effect to the consolidation gangue?s cohesive strength and the fresh gangue?s internal frictional angle. Compare with fresh coal gangue，the consolidation coal gangue is more sensitive to the moisture content of specimen. When the moisture content is close to saturation state，the internal friction angle of consolidation coal gangue is nearly zero and the shear strength is mainly provided by the internal cohesive force at this time. Meanwhile the reducing range of fresh coal gangue is less than 15%. The difference of shear strength characteristics is related to the fine particle composition in coal gangue. The test results in this paper can offer a basis for the stabilization calculation of coal gangue hill.

Key words： rock mechanics consolidation gangue fresh gangue direct shear test moisture content shear strength

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0303 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/2808

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