基于核磁共振T2谱图的裂隙砂岩疲劳损伤分析
毛思羽,曹平,李建雄,欧传景

Fatigue Damage Analysis of Fractured Sandstone Based on Nuclear Magnetic Resonance T2 Spectrum
Siyu MAO,Ping CAO,Jianxiong LI,Chuanjing OU
表4 各倾角裂隙砂岩的损伤变量D′的相关方程
Table 4 Correlation equation of damage variable D′ of fractured sandstone with different inclination angles
裂隙角度/（°）D′与上限应力比的关系D′与上限应力（σmax）的关系
0D0′=0.2331+0.8789*x3.33836

D0′=0.2331+0.8789*

（σmax/39.58）3.33836

15D15′=0.3342+1.0175*x10.39212

D15′=0.3342+1.0175*

（σmax/33.66）10..39212

30D30′=0.2835+0.8941*x5.426

D30′=0.2835+0.8941*

（σmax/35.75）5.426

45D45′=0.3606+0.7257*x3.10133

D45′=0.3606+0.7257*

（σmax/37.72）3.10133

60D60′=0.2388+0.9912*x6.46836

D60′=0.2388+0.9912*

（σmax/36.51）6.46836