西安公路交通大学学报010105 关键词： 平面应变；无粘性土；中主应力；经验公式 [gap=670]Keywords ：plane strain;cohesionless soil;intermediate principal stress;empirical formula
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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.
研究表明：土体广义剪应力与广义剪应变关系曲线呈明显的非线性，中主应力对土体强度的影响存在区间效应。
The study results show that generalized shear stress has a strong nonlinear relation with generalized shear strain, and intermediate principal stress has interval effect on soil strength.
在土木建筑工程中主应力迹线是布筋方向的依据，但是在工程中通常都是徒手或用曲线板近似绘制主应力迹线。
In civil engineering, the disposing of reinforcing steel bars is often based on the analysis of the principal stress traces.
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