单轴压缩下单裂隙砂岩试件破坏强度特征的数值分析研究

Numerical Analysis on Strength Characteristics of Sandstone Samples Failure with Single Fracture in the Condition of Uniaxial Compression

基于摩尔-库伦理论和统计损伤理论,通过数值计算,模拟了单轴压缩条件下单裂隙砂岩试件的破坏过程,得出了不同倾角(0°、15°、30°、45°、60°、75°、90°)单裂隙砂岩试件破坏时的单轴抗压强度及影响规律。结果表明:当裂隙倾角α=45°时,岩体试样的强度峰值最低;当裂隙倾角α【45°时,随着裂隙倾角的增大,岩体试样的强度峰值呈递减的趋势;当裂隙倾角α】45°时,随着裂隙倾角的增大,岩体试样的强度峰值呈递增的趋势;其中,α在15°~75°范围内,岩体试样的强度峰值变化显著。研究对于裂隙岩体工程的稳定与安全具有重要的理论意义。

Based on Mohr-Coulomb theory and statistical damage theory,the failure process of sandstone samples with single fracture in the condition of uniaxial compression is simulated. And the influence rules of different inclination( 0°,15°,30°,45°,60°,75°,90°) on the uniaxial compressive strength was obtained through the numerical calculation. The result shows that the peak strength appears to be the minimum when the fissure angle α =45°. And when the fissure angle tends to be less than 45,the peak strength of the sandstone sample decreases with the increase of fissure angle. However,when the fissure angle turns to be more than 45,the peak strength of the sandstone sample increases with the enlargement of fissure angle. In particular,the peak intensity of the samples changes dramatically when the fissure angles varies from 15 to 75. This thesis can makes a difference in the safety and stability of engineering rock mass with fractures.