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Plastic limit bearing calculation of blasting-roof in deep hole mining and its applications

机译：深孔采矿爆破屋顶塑性极限承载力计算及其应用

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摘要

A plastic bearing calculation method for a blasting-roof is proposed to solve the problem of determining the blasting-roof thickness in deep hole mining. A mechanical analysis model for the plastic bearing was built for the typical boundary conditions of blasting-roofs. The external and internal work of the blasting-roof are equal under the plastic limit state through calculation. The limit bearing formulae of blasting-roofs under various boundary conditions were derived based on the principle of virtual work. A Vertical Crater Retreat stope was taken as the object, and the safe blasting-roof thickness was determined to be 6 m using the derived formula (considering the safety coefficient). A numerical model of stope was constructed using the Surpac-Flac3D technique, while the blasting-roof stability was simulated under different thicknesses. Variations in the simulated indexes (stress and plastic zone volume) prove that the theoretical calculations are reliable. The plastic bearing calculation method can provide a new method to determine the blasting-roof thickness in deep hole mining.
机译：为了解决深孔开采中确定顶板厚度的问题，提出了一种顶板塑性轴承计算方法。针对爆破屋顶的典型边界条件，建立了塑料轴承的力学分析模型。通过计算，在塑性极限状态下，爆破屋顶的外部和内部工作是相等的。根据虚拟工作原理，推导了不同边界条件下爆破屋顶的极限承载公式。以垂直火山口撤退采场为对象，并使用推导公式（考虑安全系数）确定安全爆破屋顶厚度为6 m。利用Surpac-Flac3D技术建立了采场的数值模型，同时模拟了不同厚度下的顶板稳定性。模拟指标（应力和塑性区体积）的变化证明了理论计算是可靠的。塑性轴承计算方法可以为确定深孔开采爆破顶板厚度提供一种新方法。

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