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《Chinese Journal of Underground Space and Engineering》 2013-03
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The Stability of Mine Pillar Based on Whole Stress-Strain Process

Sun Zaiming1,Sun Qiang2(1.Department of Civil Engineering and Architecture,Shaanxi Railway Institute,Weinan,Shaanxi, 714000,China;2.School of Resources and Earth Science,China University of Mining and Technology, Xuzhou,Jiangsu 221116,China)  
The research of pillar stability and bearing capacity is a hot topic and key point in underground mining.Comparing the similarity of mine pillar failure with rock compression process,and combining the AE(acoustic emission) character of rock uni-axial compression test results,it is shown that the instability process of mine pillar has different stages.Analyzing the relationship of AE and rock compression process under loading,the failure process of mine pillar is classified into four stages according to the different deformation before its damage,which are the compaction stage,the elastic stage,stable cracking stage and unsteady crack growth stage.From the test,it is revealed that the number of acoustic emission events has a rapid increase in the process of rock damage near the yield point with the fast initiation and growth of micro fracture.The rock failure pattern appeared as along one or more uneven fracture surfaces,there was a peak jumping point of AE in AE-strain curve.The AE peak point is near the inflection point on stress-strain curve.The characteristics of increasing of AE in unsteady crack growth stage can be used to provide geological and scientific foundation for analysis on pillar stability and bearing capacity.
【Fund】: 中央高校基本科研业务费专项资金(2010QNA54);; 江苏省博士后基金(1001047C)
【CateGory Index】: TU452
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