单双向约束下冲击荷载对煤样渐进破坏的影响规律研究

doi:10.13722/j.cnki.jrme.2020.0322

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Abstract A systematic impact load test on the progressive failure of briquette coal under unilateral and biaxial constraints was conducted by using the restraint pendulum impact dynamic loading test device and the ultrasonic testing device，and destruction characteristics and energy dissipation law of coal samples during the impact process of different cycles until macro damage was analyzed. The results show that the damage of the samples increases in an inverted S form with the impact number. Under the unilateral constraint condition，the cumulative damages of the samples are the largest when the axial stress is 1 MPa，and with increasing the axial stress，the damage is greatly reduced. For the biaxial constraint condition，however，the coal sample is least likely to occur damage when both the horizontal constraint and the axial constraint stresses are 1 MPa. In the case of that the horizontal restraint stress remains unchanged and the axial stress increases gradually，the samples would be damaged significantly，especially at the final period. The evolution of progressive destruction of coal samples is explained from the aspect of energy dissipation，and the energy criterions of damage and destruction for two cases are given.

Key words： rock mechanics unilateral and biaxial constraints impact load damage degree energy dissipation

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0322 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I1/53

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