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为了解释采空区影响下火成岩断裂破坏诱发地表裂缝的形成原因,通过建立两种采动影响下的火成岩断裂物理力学模型,推导出采动影响下火成岩初次断裂和周期性断裂判据。结合铁法晓南矿开采出现的地表裂缝,分析了火成岩断裂破坏机理,并对火成岩断裂破坏进行了预测。通过与现场实测地表裂缝位置加以验证,证明了所建力学模型的可靠性,并给出了后续生产中关于地表裂缝的规避性建议。
In order to explain the formation reason of surface cracks induced by the fracture damage of igneous rocks under the influence of goaf, by establishing two models of physical model of igneous rock fracture under the influence of mining, the criteria of primary fracture and periodic fracture of igneous rock under mining are deduced. Combined with the surface cracks in the mining of Xiaonan mine in Tiefa, the mechanism of fracture and failure of igneous rock is analyzed and the rupture of igneous rock is predicted. The reliability of the proposed mechanical model is verified by verifying the location of the measured surface cracks in the field and the suggestions of avoidance of the surface cracks in the subsequent production are given.