不同构造区主应力方向存在一定的差异。
There are some differences of principal stress between secondary tectonic areas.
主应力迹线是代表主应力方向的曲线簇。
The principal stress traces represent the directions of principal stresses inside an object.
初裂缝是沿着最大水平主应力方向的垂直缝。
The beginning of crack is vertical along the orientation of maximum horizontal principal stress.
不同主应力方向的破坏强度最大差别可达30%。
The maximUm difference of failure strength among various principal stress direction is up to 30%.
文章给出了一种判断平面应力状态主应力方向的简便方法。
In the article, a simple method is discussed to confirm the principal stress direction un-den the plane stress condition.
阐述了一种新的解析法确定主应力方向的极为简便易行的方法。
A new simplified way is introduced that applies analytics to determine primary stress dimension in configuration.
本文分析、比较了由不同方法测得的华北地区最大水平主应力方向。
The measured maximum horizontal principal stress orientation in North China by different methods were compared in this paper.
结果：在对称性咬合，牙位的变化对各牙的根尖主应力方向无影响。
Results: the variation of tooth position gave no effects to the directions of principle stress around apex area in symmetrical occlusal type.
结果表明，主应力方向的连续旋转导致了钙质砂中孔隙水压力的增长。
It was showed that the continuous rotation of principal stress induced the development of pore water pressure in carbonate sand.
通过适当的设计，可以使晶粒流动方向与实际使用时的主应力方向一致。
With proper design, the grain flow can be oriented in the direction of principal stresses encountered in actual use.
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.
洞室地应力以构造应力为主，其最大主应力方向与厂房轴线方向近垂直。
The cave's initial principal stress is tectonic stress, and the Max main stress's direction is perpendicular to the power house's stalk line.
取得了该区最大水平主应力、最小水平主应力量值及最大水平主应力方向。
The maximum and the minimum horizontal stresses and the direction of the maximum horizontal stress are obtained.
可将四分之一波片卸去，并按平面偏振光法或内插法来决定其主应力方向。
The directions can be obtained by removing the quarter-wave plate and following the procedure for plane polarized light or by interpolation.
研究表明，主应力方向对在不排水条件下饱和松砂的单调剪切特性具有显著影响。
It was found that the undrained shear behavior of loose sands was considerably dependent on the orientation of the principal stress.
因此可以通过这些次级构造和雁列类型的关系，来判断断层的运动和主应力方向。
The fault movement and the direction of principal stresses may be determined by considering the relationship between the different secondary structures and en-echelon patterns.
最大水平主应力方向以近东西向为主，水力压裂裂缝的延伸方向也以近东西向为主；
The conclusion is that the size of terrestrial stress mainly is vertical principal stress maximum and the fracture of hydraulic fracturing is vertical.
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。
Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.
在水平方向上，中国东部地壳的主应力方向为近东西向的压应力，但总体上是向东推移的。
The main horizontal stress in eastern China is the pressure near EW direction, but as a whole, the crust is moving east.
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.
依据压裂曲线，利用破裂压力孔隙弹性计算模型，计算得到了在两个水平主应力方向的弹性应变量；
Basing on fractureing calculation model with pore elasticity theory, the elastic strain in horizontal direction has been determined with hydraulic fractureing curve.
结果表明：随着初始主应力方向角的增大，轴向残余变形由压缩状态的正值逐渐过渡到伸长状态的负值。
The results show that: with the initial principal stress direction angle increases, the axial residual deformation from the compression state gradually transits to the elongation.
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。
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.
双向水平应力不同时，随着差异的增大，井底岩石各向异性程度增大，钻头向最大水平主应力方向的漂移趋势增强。
If the two horizontal stresses are different, the degrees of rock anisotropism under bottom is increased as long as...
在模型实验应力分析中采用脆性涂料法确定模型机架最大主应力部位和主应力方向，采用电阻应变测量法确定模型机架的主应力水平。
Stress coating is adopted in order to determine the points and directions of the most main stress of the frame, resistance strain gauge method used for determining main stress value of the frame.
平面应力状态下最大主应力方向的判定在工程及教学中具有重要意义，应用平面应力理论可以找到判定其方向的快捷方法，并引用实例得到印证。
It is of great significance in engineering and teaching to determine the direction of the largest main stress under the status of plane stress.
结论：牙在下颌骨上相对位置的变化会对其根尖主应力大小及方向产生一定的影响，而且其影响程度还会受到咬合对称性等因素的影响。
Conclusions: the variation of tooth position could affect the magnitude and direction of the main apical stress, in which the symmetry of the occlusion type was also involved.
研究表明：介质爆破裂纹的方向及大小与附加的主应力有关。
The result of the study has shown that the direction and magnitude of the blasting crackle relate to subjoining main stress.
土的平面应变是岩土工程中常见的状态，其中零应变方向的主应力是十分复杂的。
Plane strain state is familiar in geotechnical engineering, and estimating the principal stress in the plane strain state is very complicated.
当高角度缝的走向与最大水平主应力的方向一致时，后期水平应力对原生裂缝有保持作用；
When the high-angle fracture has the same direction with the maximum horizontal stress, the subsequent horizontal stress will preserve the primary fracture.
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