西石门铁矿地应力量测与应力场的反分析

STRESS MEASUREMNT AND ANALYSIS IN XISHIMEN IRON MINE

本文通过西石门铁矿的地应力量测和应力场的反分析,对该矿区地应力场首次进行了系统的研究,提出了西石门铁矿的应力场是以水平应力为主的旋转压应力场,从南到北,其水平主应力方向为北东→北南→北西向;揭示了水平主应力随深度变化的规律以及平均水平主应力与垂直主应力之比“K”值随深度变化的规律;并从力学角度探讨了应力场与井下巷道稳定、采矿工程设计之间的关系,为地下采矿科学化提供了理论依据。

This paper presents the results of in-situ stress measurement and analysis in Xishimen iron mine.A rotating stress field in which the major principal stress is in horizontal direction was measured in the mine area. The varying trend of direction of the major principal stress from north to south is NE-NS-NW. The relationship between the magnitude of the horizontal principal stress and the depth and the ratio of the average horizontal stress to the vertical stress were obtained. The ratio also varies with the depth.Suggestions are given about how to design and maintain the stability of the openings under the measured stress field condition.