水平采空区群离散多自由度动力响应模型

doi:10.13722/j.cnki.jrme.2015.0126

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Abstract In order to investigate the horizontal dynamic response of horizontal goaf group，a discrete dynamic response model was established by converting horizontal goaf group into a discrete vibration system of multiple degrees of freedom. The factor p considering the dissipation of energy in the surrounding rock(external damping) was introduced to modify the dynamic response model. Two cases，one is pillar blasting in single-layer and another is roof mine quake in multilayer horizontal goaf group，were numerically simulated with the unmodified model and modified model respectively. The results indicated that both the modified and unmodified model effectively responded to the instantaneous and continuous dynamic load. The value of factor p depends mainly on the transfer path and transmission distance of the energy in rock mass，which is not obviously influenced by the occurrence conditions of single-layer and multilayer horizontal goaf group. The modified model fits better the results of numerical simulation compared to the unmodified model，which to some extent reveals the dynamic response of horizontal goaf group. A new effective way has been provided for horizontal dynamic response of horizontal goaf group.

Key words： mining engineering horizontal goaf group dynamic response model discretization multi degree of freedom energy dissipation

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0126 OR http://www.rockmech.org/EN/Y2016/V35/I1/59

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