The axes of principal stress rotated before earthquake.
震前主应力轴的旋转。
There are some differences of principal stress between secondary tectonic areas.
不同构造区主应力方向存在一定的差异。
The principal stress traces represent the directions of principal stresses inside an object.
主应力迹线是代表主应力方向的曲线簇。
The beginning of crack is vertical along the orientation of maximum horizontal principal stress.
初裂缝是沿着最大水平主应力方向的垂直缝。
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%。
Integrating the minimum principal stress principle, the re-fracturing crack azimuth is determined.
再结合最小主应力原理，确定重复压裂裂缝方位。
At the beginning of loading, the major principal stress centralize in a triangle area under the lap.
刚开始加载时，最大应力集中在搭接面以下的一个三角形区域内。
In the article, a simple method is discussed to confirm the principal stress direction un-den the plane stress condition.
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。
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。
The measured maximum horizontal principal stress orientation in North China by different methods were compared in this paper.
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。
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。
It was showed that the continuous rotation of principal stress induced the development of pore water pressure in carbonate sand.
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。
The calculation shows that the radius and displacement of plastic zone will reduce when the neutral principal stress is considered.
计算表明考虑中间主应力时圆筒形孔的塑性区半径有明显减少。
It was found that the undrained shear behavior of loose sands was considerably dependent on the orientation of the principal stress.
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。
Slip rate, net slip and the Numbers of unstable events depend on the orientation of the fault with respect to the principal stress axes.
每条断层的位移速率、总位移量以及失稳事件数与断层方向和主压应力轴的夹角有关。
Although the value of axial strain of refuse exceeds 30 %, the phenomenon of the increase of the principal stress difference is observed.
观察到垃圾土的轴向应变超过30 %而其主应力差仍然在增长。
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.
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。
Plane strain state is familiar in geotechnical engineering, and estimating the principal stress in the plane strain state is very complicated.
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。
The crystal axes and the principal stress axes are obtained from the optical indicatrix axes manually by turning the projection diagram as usual.
以往是通过手工转图由光率体主轴获取晶轴和应力主轴的，把手工操作变为计算机运算和成图，是一个重要的附加课题。
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。
The conclusion is that the size of terrestrial stress mainly is vertical principal stress maximum and the fracture of hydraulic fracturing is vertical.
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；
Decreasing of the minimal horizontal principal stress, or more, may he responsible for a trigger of the earthquake associated with a change in stresses.
应力改变触发地震的机制，主要是由于最小水平主应力的减小，或两个水平主应力同时减小。
This paper describes the transducer of the resistance strain gauge, the formulas for its principal stress and the application of the earthquake prediction.
本文介绍了电阻应变片传感器及其主应力公式和在地震予报中的应用。
The results show that vertical stress is equal to overburden stress at shallow level. Maximum principal stress is sub horizontal stress in the NE direction.
结果表明：显德汪煤矿垂直应力近似等于上覆岩层的自重应力，最大主应力为北东方向，且为近水平压应力。
On the base of loading properties of hollow cylinder apparatus, loading method to simulating the principal stress axes rotation in laboratory tests is given.
以此为基础，结合空心圆柱仪的加载特点，给出了室内模拟主应力轴旋转的加载方法。
Based on the experimental results, the boundary stress and inside stress of the bridge pier are given and the relevant trace of the principal stress is drawn.
通过实验给出了桥墩的边界应力及内部应力，并绘出了相应的主应力迹线。
Two different kinds of failure patterns have been observed and the failure of strengthened beam is attributed to the principal stress at the end of steel plate.
明确加固梁具有两种不同破坏模式，其破坏是由钢板端部的主应力大小决定的。
To increase component of grinding force ratio can increase principal stress extreme values in grinding stress field. Materials can be removed by brittle fracture.
粗加工中，增加磨削分力比可以增大磨削应力场中的主应力极值，有助于材料的脆性去除。
The numerical results showed that the intermediate principal stress weightily affected the spatial combination regularities of different kinds of structure planes.
计算结果表明：中间主应力对构造结构面之间的空间组合规律具有重要影响。
The numerical results showed that the intermediate principal stress weightily affected the spatial combination regularities of different kinds of structure planes.
计算结果表明：中间主应力对构造结构面之间的空间组合规律具有重要影响。
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