Locating the orientation of the corresponding relationship between principal stress and principal plane and its mathematics certification 主应力与主平面对应关系的判定及其数学证明
On fem simulating its stress and displacement characteristics , the contour of maximum and minimum principal stress have been drawn 分析结果表明，长白山天池地区高陡斜坡整体稳定性较好，不会发生大规模崩塌。
The failure criterions of principal stress , octahedral stress and strain space are established . ( 7 ) the biaxial compression - tension t 建立了主应力、大连理工人学博士学位论文一八面体应力和应变空间的混凝土破坏准则。
The mohr - coulomb model is based on plotting mohr ' s circle for states of stress at failure in the plane of the maximum and minimum principal stresses 莫尔库仑模式基于莫尔圆来判断最大和最小主应力平面上的破坏应力状态。
It points out that the principal strain rate is coaxial with the principal stress at critical state and is independent of the critical stress surface 指出散粒体临界状态下的主应变率与主应力共轴，而与临界应力面形状无关。
The contour diagrams for the principal stresses are drawn by using surfer 7 . 0 software for the summarization of the stress distribution . the results obtained are reasonable 为了应力分布作出评价用surfer7 . 0软件获得了主应力线图，所得结果是合理。
In the middle of tunnel , maximum principal stress at horizontal is bigger than that at vertical , the magnitude is 17 ~ 23mpa , which formed the high stress site 隧道中部大埋深地段，最大水平主应力一般都大于垂直主应力。量级在17 23mpa左右，属于高应力地段。
It is very difficult to determine the directions of the principal stresses or strains in plane problem for teaching material mechanics and engineering application 摘要平面应力和平面应变状态下主应力和主应变方向的确定，无论是在工程应用还是在材料力学教学中都是非常重要的难点。
A valid method to make the anisotropic deformation behavior of load bearing unit clear is to research principal stress and principal strain relationship , and true triaxial test is a necessary means 弄清受荷单元的主应力主应变关系是认识各向异性变形性状的有效方法，而真三轴试验是必要的手段。
( 6 ) the principal stress direction arised deflexion obviously after excavation , the maximum principal stress paralled to opening , minimum principal stress vertical to sidewall or vault ( 6 )数值模拟研究表明，隧道开挖后，主应力方向发生明显偏转，最大主应力与开挖临空面平行，最小主应力近于垂直。
