【摘要】 本文以研究某石膏矿山地下采空区的长期稳定性为背景 ,以室内纯扭转流变实验为手段 ,研究了硬石膏的流变特性。通过对所获得的流变曲线的分析 ,建立了应力应变与时间之间的函数关系式 ,在此基础上获得了硬石膏的长期强度τ∞ =2 77MPa ,此值仅为硬石膏瞬时强度的 6 6 %。更多还原

【Abstract】 To shudy long\|time stability of underground mined\|out area of an anhydrite mine,the rheological properties of anhydrite are researched by laboratory torsion rheological test.By analysing the obtained rheological curves,a functional relation formula between stress-strain and time is established.Based on this,the long-time strength of τ ∞=2 77MPa of anhydrite is gotten.This value is only 66% of its instantaneous one.更多还原