Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.
提出了主应力的偏角误差概念及其计算方法，使主应力方向的精度评定更加真实客观。
The maximUm difference of failure strength among various principal stress direction is up to 30%.
不同主应力方向的破坏强度最大差别可达30%。
The theoretical result shows that the direction of plastic strain increment is determined by the direction of principal stress and stress increment.
从理论上说明塑性应变增量的方向不仅与应力的主方向有关，还与应力增量的方向有关。
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。
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。
The direction of the major principal stress in a region remains the same from tens of meters to 4000 meters below surface.
一个地区的主压应力方向在地下几十米至4000米大体是一致的。
Results show that the displacement in horizontal direction and the maximum principal stress of core wall will increase to a larger extent if the creep effect of asphalt concrete is considered.
分析结果表明，考虑蠕变效应，心墙的水平变形与最大主应力将有较大的增加。
It is pointed out that the principal compressive stress direction of tectonic stress field in the area is nearly s - n.
指出，该区构造应力场的主压应力方向为近南北向。
The numerical results show that the extremum direction of shear waves coincides with the direction of far-field principal stress. Furthermore, we verify the validity condition of the simplified model.
数值结果表明横波波速的极值方向与岩石远场应力的方向相一致，指出了简化模型的适用条件。
When the direction of tunnel axis is vertical to the maximum principal stress, the depth of BEDZ is larger than that of which the direction of tunnel axis is parallel to the maximum principal stress.
隧洞轴线垂直于最大主应力时的钻爆开挖损伤明显要大于轴线平行于最大主应力时的情况；
With the increase of lateral pressure modulus, the magnitude of principal stress decreases and the direction of it is hardly changeable ;
分析得出，随著侧压力系数的增大，主应力量值减小，主应力方位难改变；
With the increase of lateral pressure modulus, the magnitude of principal stress decreases and the direction of it is hardly changeable ;
分析得出，随著侧压力系数的增大，主应力量值减小，主应力方位难改变；
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