围压卸荷对矿柱破坏模式影响分析  

Analyses on Influence of Unloading Confining-Pressure on Failure Modes of Pillar

作　　者：袁瑞甫[1] 李元辉[1] 赵兴东[1] 姚旭朋[1] 

机构地区：[1]东北大学资源与土木工程学院

出　　处：《矿业研究与开发》2006年第2期24-26,共3页Mining Research and Development

基　　金：国家自然科学基金项目(50174013)

摘　　要：利用东北大学岩石破裂过程分析系统(RFPA2D),研究了围压卸荷对矿柱破坏模式的影响。通过对不同围压卸荷方式中岩石试件的应力积累、裂隙扩展及整个破坏过程进行分析,得出了围压卸荷条件下矿柱的破坏规律。数值计算结果表明,当轴向载荷超过岩石试样的单轴抗压强度时,对试件围压实施一次卸荷容易引起岩石剧烈的脆性破坏,而对试件实施围压逐步卸荷,岩石试件则呈现出较明显的延性特征,其内部积累的能量随着卸荷步骤逐渐释放出来,能避免岩石发生剧烈脆性破坏。这一结果对指导采场开挖过程中,保护采场以及矿柱的稳定具有重要的理论意义。The influence of unloading confining- pressure on the failure Modes of Pillar was researched using Rock Failure Process Analysis （RFPA2D） developed by Northeastern University. The whole failure process of rock specimen under different conditions of unloading confining - pressure was simulated and analyzed, including stress accumulation, crack propagation and so on, and the failure law of pillar under unloading confining - pressure was obtained. The results of numerical calculation show that when the axial load is higher than the uniaxial compressive strength of rock specimen, once unloading of confining pressure easily causes violently brittle failure of rock, however, under step - by - step unloading of confining pressure rock specimens show obviously ductile character and the accumulated stress in rock specimen gradually releases,and the violently brittle failure of specimen would be avoided. The conclusion is valuable to the work of excavating in rock mass and maintaining the stability of stope and pillar in mine.

关 键 词：围压效应 逐步卸荷 数值模拟 矿柱稳定性 

分 类 号：TD823[矿业工程—煤矿开采]