复杂荷载作用下残采矿柱综合安全系数

来源期刊:中南大学学报(自然科学版)2018年第6期

论文作者:姜立春 王玉丹

文章页码:1511 - 1519

关键词:矿柱;综合安全系数;爆破荷载;崩落体;覆岩

Key words:pillar; comprehensive safety coefficient; blasting vibration; caving body; overburden rock

摘    要:为了安全地开采残矿矿柱,在构建矿柱受力模型的基础上,给出覆岩、采场内崩落体挤压、爆破震动等荷载对矿柱综合作用的轴向应力函数表达式;针对矿柱压缩、剪切破坏形式,提出综合荷载残矿开采环境下矿柱安全系数(K)的计算方法,给出矿柱压缩安全系数(K1)、剪切安全系数(K2)和综合安全系数(K)计算式,研究覆岩、崩落体及爆破震动等荷载对矿柱稳定性的影响。研究结果表明:矿柱垂直方向综合荷载与矿柱高度呈正相关关系,与矿柱宽度呈负相关关系;当矿柱宽度一定时,矿柱安全系数随着矿柱高度增加而递减。通过某大型金矿残采工程实例,验证了计算结果的可靠性。研究结果可为矿柱安全定量评价提供依据。

Abstract: In order to exploit the remnant pillar safely, based on the pillar mechanical model, the function expression of stress component including the loadings of upper rock gravity, caving body extrusion and blasting vibration load reacting to the pillar was put forward. By analysing the pillar compression and shear destruction form, a calculation method for pillar safety factor (K)under the multi-load circumstances was proposed, and pillar compression safety factor (K1), shear safety factor (K2) and integrated safety factor (K) formula were figured out, and the pillar stability influenced by the overburden rock, caved ore body and blasting vibration loads was investigated. The results indicate that the vertical comprehensive load is correlated positively with the height of the pillar, and negatively with the width; when the pillar width remains constant, the pillar safety factor decreases with the gradual increase of the height. Based on the engineering case of a large gold mine, the safety coefficient calculation method to evaluate the reliability of the pillar security is verified. This method theoretically supports how to quantitatively assess the pillar safety.

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