The results show that the frictions caused by the wall of shear box will influence the distributions of stresses in specimens and the normal pressure stresses on the shear plane.
结果表明，剪力盒壁摩擦力将会影响试验土样中的应力分布和剪切面上的正压应力值。
So a split-type shear box is adopted to conduct the in-situ shear test in order to make the stress on the shear plane uniform and ensure the shear stress to running through the center o.
我们改进后采用分体式剪切盒进行原位土体试验，使剪切面上的应力分布均匀，保证剪力通过剪切缝中心，同时在试验过程中法向及剪向加载时试体稳定性得到了很好的改善。
An equation for the calculation of true shear strain was derived from the integration of infinitesimal shear strain in plane shearing process with constant principal shear strain direction.
对切应变主轴不变的平面简单切变过程，通过无穷小应变的积分，导出了真实切应变计算公式。
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