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首页> 外文会议>Geotechnical Special Publication no.143; Japan-U.S. Workshop on Testing, Modeling, and Simulation; 20030627-29; Boston,MA(US) >CHANGE IN MULTIPLE YIELD SURFACES OF DENSE TOYOURA SAND WITH SHEARING IN A p'-CONSTANT PLANE
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CHANGE IN MULTIPLE YIELD SURFACES OF DENSE TOYOURA SAND WITH SHEARING IN A p'-CONSTANT PLANE

机译：p'-恒定平面上的致密致密砂的多个屈服面的变化

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摘要

The paper investigates the anisotropic yielding behaviour of dense Toyoura sand from very small to large strain in a p'-constant shear plane by means of hollow cylinder torsional shear tests. The effect of initial stress state on the shear yielding was one of the major issues in this study. Efforts were made to draw yield surfaces in the stress space. To pay special attention to anisotropic yielding due to solely the shear process, p' was kept constant to avoid yielding caused by the change of p'. The σ_1'-direction from the vertical in the shear process was fixed to be from 0° to 90° at 11.25° interval. It was found that the sand starts yielding progressively from the strain level as small as 0.002%. Two subyield surfaces, Y_1 and Y_2, were identified inside the large-scale yield surface, Y_3. When the initial stress state was at the origin of the shear plane, the shape of yield surface was approximately circular with the center shifted toward compression in the vertical direction. Y_1 and Y_2 surfaces were evolving and moved with the current stress point in the p'-constant shear plane, though Y_3 surface was comparatively immobile. The shapes of the yield surfaces also changed with the movement of current stress point.
机译：本文通过空心圆柱体扭转剪切试验研究了稠密的丰谷砂在p'-恒定剪切面上从很小到很大应变的各向异性屈服行为。初始应力状态对剪切屈服的影响是该研究的主要问题之一。努力在应力空间中绘制屈服面。为了特别注意仅由剪切过程引起的各向异性屈服，p'保持恒定以避免由p'的变化引起的屈服。在剪切过程中，垂直方向的σ_1'方向固定为0°到90°，间隔为11.25°。已发现，砂土从低至0.002％的应变水平开始逐渐屈服。在大规模屈服面Y_3内确定了两个子屈服面Y_1和Y_2。当初始应力状态处于剪切平面的起点时，屈服面的形状近似为圆形，其中心在垂直方向上朝向压缩方向移动。尽管Y_3表面相对不动，但Y_1和Y_2表面在当前应力点位于p'恒定剪切平面内演化并移动。屈服面的形状也随着电流应力点的移动而改变。

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