Calculation method of pressures acting on shaft wall based on twin shear unified spatially axisymmetric characteristics line theory

A new unified axisymmetric characteristics line theory for weight materials is proposed based on the twin shear failure criterion;and pressures acting on the shaft wall are researched;and a new calculating method is given out with the new axisymmetric characteristics line theory.Example results show that the relationship between the pressures and the shaft depth is nonlinear.The parameter b in the twin shear unified strength criterion has significant effect on pressures.The larger the b is,the less the pressures are when shaft is at the same depth.