缓倾斜薄矿体矿柱回采采场围岩稳定性研究

为解决缓倾斜薄矿体矿柱安全高效回采这一难题，对采场围岩稳定性进行研究是非常必要的。以三山岛金矿平里店矿区为工程背景，在前期现场调查、室内力学试验及岩体力学参数工程处理的研究基础上，运用RMR分级法和Q系统分级法分别对缓倾斜薄矿体矿柱回采围岩质量进行分级研究，得出采场围岩稳定性一般；分析了缓倾斜薄矿体采空区顶板破坏机理，并基于Burgers体建立了缓倾斜薄矿体采空区流变力学模型，为采场支护提供了理论依据技术支持；设计了缓倾斜薄矿体矿柱回采采场围岩应力实时监测系统，得到了采场围岩应力变化规律，现场实践证明：监测系统精度高、运行稳定。

Study on surrounding rock stability of pillar extraction in thin gently inclined ore body

In order to solve the difficult problem of pillar extraction safely and efficiently in thin gently inclined ore body，the study of surrounding rock stability is very necessary.Pinglidian mining area of Sanshan Island Gold Mine was studied in this paper.On the basis of site investigation，laboratory rock mechanics test and the mechanical parameter analysis of rock mass，the surrounding rock quality of extracted pillar in thin gently inclined ore body were studied using the RMR classification method，the Q system classification method respectively.Results show that the surrounding rock stability of the stope is average.Also，the roof damage mechanisms of thin gently inclined ore body were analyzed.The rheologic mechanics model of roof was established based on Burgers model，which provides a theoretical basis and reference for roof supporting.In addition，a real-time monitoring system of surrounding rock stress was designed，which works well in pillar extraction in thin gently inclined ore body，and the variation of surrounding rock stress was obtained.The practical application proves that the system has high accuracy and stability.