The direct earth pressure should be calculated by analysis of minor principal stress 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。
Keeping the minor principal stress 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。
On the contrary, the porosity of dilation bands is quite bigger than the surrounding rocks. Thus dilation bands are perpendicular to the minor principal stress, accompanied by shear bands.
膨胀条带与压缩条带相反，孔隙度明显大于周围岩石，发生在垂直于最小主应力方向上，并与剪切条带共生。
While direction of previous main faults that intersect the maximum principal stress by minor Angle also probably becomes the major migration direction of oil and gas.
与最大主应力小角度相交的先期主要断裂的方向也可能成为油气运移的主要方向。
While direction of previous main faults that intersect the maximum principal stress by minor Angle also probably becomes the major migration direction of oil and gas.
与最大主应力小角度相交的先期主要断裂的方向也可能成为油气运移的主要方向。
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