确定硬岩矿山矿柱强度的新方法

Datermination of the Strength of Hard-rock Mine Pillars

本文介绍了为开发确定硬岩矿山矿柱强度新方法所取得的研究成果。地下矿山所留矿柱的形状和大小各异。要使矿柱达到要求，必须进行严格的工程设计确定矿柱强度和应力。作者将详细的矿柱稳定性分析与公开的矿柱实测（178例）数据库相结合，推导出一种新的复合矿柱强度计算公式。式中考虑了经典的岩体强度方法与经验方法，采用由矿柱中心平均最小／最大主应力比计算出的矿柱摩擦系数。据统计，新的公式比目前采用的经验公式预计矿柱强度的结果更好，其可信度更高。

This paper presents the results of research that has been undertaken in order to develop an improved methed of determining the strength of hard-rock mine pillars. Pillars are found in various shapes and size in all underground mining operations. Prudent engineering design requireS that if pillars are to perform as desired, both the pillar strength and the pillar stress must be determined. A detailed pillar stability study has teen combined with an extensive database of published pillar case histories (178) resulting in a new'hybird' pillar strength formula, 'The Confinement Formula',utilizes classic strength of rock metheds combined with empirical methods. 'The Confinement Formula' utilizes a'mine pillar friction term' calculated from the average minor/major stress ratio within the pillar core. Statistically, the new formula provides better result at predicting pillar strength for the combined database than the best empirically fit pillar metheds that currently exist. 'The Confinement formula' allows for the determination of the strength of mine pillars with an increased level of confidence over previously applied methods.