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

In order to solve the problem that blasting-roof thickness was hard to determine in deep hole mining, the plastic bearing calculation method of blasting-roof was proposed. Aim at typical boundary conditions of blasting-roof, mechanical analysis model of plastic bearing was built. The external work and internal work of blasting-roof under plastic limit state were calculated. Based on virtual work principle, the limit bearing formulas of blasting-roof under various boundary conditions were derived. Taking a VCR stope as the object, the safe blasting-roof thickness was determined as 6m by derived formula (considering safety coefficient). Numerical model of stope was constructed by Surpac-Flac3D technique, while blasting-roof stability was simulated under different thickness. The variation of simulated indexes (stress, plastic zone volume) prove that theoretical calculation is reliable. The plastic bearing calculation method can provide a new way for determining blasting-roof thickness in deep hole mining.

针对深孔采矿中爆破顶板厚度难以确定的工程难题，本文提出了爆破顶板塑性承载计算方法。针对爆破顶板的典型边界条件，建立了塑性承载力学分析模型；计算了塑性极限状态下爆破顶板的外力功与内力功；基于虚功原理，推导得到不同边界条件下爆破顶板的极限承载公式。以某垂直深孔球状药包爆破采矿法（VCR）采场为研究对象，通过推导公式并考虑安全系数，确定其安全爆破顶板厚度为6m。采用Surpac-Flac3D技术构建采场数值模型，模拟了不同厚度下爆破顶板的稳定性；模拟所得指标（应力、塑性区体积）的变化规律验证了理论计算的可靠性。该塑性承载计算方法可为深孔采矿中爆破顶板厚度的确定提供全新的技术途径。