论文部分内容阅读
以圆孔扩张理论为基础,在弹性区中采用弹性小变形理论,在塑性区中采用大变形理论和非相关联流动准则,假定土体服从广义Lade-Duncan屈服准则,在弹脆塑性软化模型的基础上,分析了考虑大变形、中主应力、剪胀特性以及软化等因素的圆孔扩张理论解答。分析结果认为:考虑大变形特性对应的塑性区半径大于小变形所对应的塑性区半径,并随剪胀参数的增加而增大;与Mohr-Coulomb准则相比,考虑了中主应力的Lade-Duncan准则提高了扩孔压力;软化参数对扩孔压力有一定影响,扩孔压力随残余摩擦角的减小而变小。
Based on the theory of circular hole expansion, a small elastic deformation theory is used in the elastic region, and a large deformation theory and a non-associated flow rule are used in the plastic region. Assuming that the soil complies with the generalized Lade-Duncan yield criterion, Based on the analysis of large deformation, the main stress, dilatancy characteristics and softening and other factors of the hole expansion theory solution. The results show that the radius of the plastic zone corresponding to the large deformation is larger than the radius of the plastic zone corresponding to the small deformation and increases with the dilatancy parameter. Compared with the Mohr-Coulomb criterion, the Lade- The Duncan criterion improves the pressure of expanding the borehole. The softening parameter has some influence on the expanding pressure, and the pressure of expanding bore decreases with the decrease of the residual friction angle.