初始大主应力方向角对动强度影响显著，随角度的增大动强度逐渐降低。
The initial orientation Angle of the major principal stress has a significant influence on the dynamic strength: as the Angle increases, the dynamic strength decreases.
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。
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.
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。
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.
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