Deduction of failure criterion for geomaterials based on maximum principal shear strain 岩土材料最大主剪应变破坏准则的推导
In the middle of tunnel , maximum principal stress at horizontal is bigger than that at vertical , the magnitude is 17 ~ 23mpa , which formed the high stress site 隧道中部大埋深地段,最大水平主应力一般都大于垂直主应力。量级在17 23mpa左右,属于高应力地段。