The direct earth pressure should be calculated by analysis of minorprincipalstress arch while the indirect earth pressure by analysis of major principal stress arch.
可用小主应力拱应力分析计算直接土压力，用大主应力拱应力分析计算间接土压力。
2
Keeping the minorprincipalstress and medium principal stress fixed, the loading in the direction of the major principal stress is a potential stress path in practical projects.
保持小主应力、中主应力不变，在大主应力方向加荷是实际工程中可能存在的一种应力路径。
3
On the contrary, the porosity of dilation bands is quite bigger than the surrounding rocks. Thus dilation bands are perpendicular to the minorprincipalstress, accompanied by shear bands.