摘要
考虑了岩石破裂后强度衰减(应变软化)和体积膨胀的重要特性,导出了巷道围岩破裂区半径、塑性区半径和周边位移的解析计算公式。研究表明,应变软化程度对围岩破裂范围有直接影响,进而影响巷道收敛;破裂膨胀性对围岩破裂范围影响不大,但对巷道收敛影响显著;围岩处于破裂状态时,巷道收敛主要是由处于残余强度状态的破裂区围岩的碎胀变形引起的。
Analytical formulae for calculating radius of fractured zone, radius of plastic zone and peripheral displacement are deducted by taking into consideration of strength attenuation (strain softening)and volumetric expansion of rocks after fragmentation of rocks.The research has shown that the degree of strain softening has direct bearing on extent of fractured zone, which affects roadway convergence. Expansion of rock has little effect on extent of fractured zone, but has obvious effect on roadway convergence. When the rocks are fractured, roadway convergence is mainly due to expansion deformation of the surrounding rock within the fractured zone in a residual-strength state.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
1995年第3期304-310,共7页
Journal of China Coal Society
基金
煤炭科学基金
关键词
岩石力学
巷道
矿井
围岩破裂
位移
rock mechanics
radius of fractured zone
roadway convergence
strain softening
volumetric expansion