Stress-Strain Response and Dilatancy of Sandy Gravel in Triaxial Compression and Plane Strain
Stress-Strain Response and Dilatancy of Sandy Gravel in Triaxial Compression and Plane Strain
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DOI：
10.1061/(asce)gt.1943-5606.0001435
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发表时间：
2016-04-01
影响因子：
3.9
通讯作者：
Arduino, Pedro W.
中科院分区：
文献类型：
--
作者：
Strahler, Andrew;Stuedlein, Armin W.;Arduino, Pedro W.
在岩土工程勘察中，均匀砂土的强度和应力应变已被广泛研究，从业者可以利用大量先前报告的数据来估计其体积响应。然而，尚未评估公认的应力剪胀理论和经验对于良好级配砾石土的适用性。轴对称，各向同性固结排水压缩，纯剪切，平面应变准K 0固结排水试验进行了级配良好的Kanaskat砾石围压范围超过三个数量级，以确定其刚度，强度和应力应变响应。Kanaskat砾石的平面应变刚度，强度和应力-应变性是从使用具有柔性囊的大立方体真三轴装置进行的试验中观察到的。从实验边界条件及其对体积响应的影响的角度来解释观察到的响应。观察到的平面应变剪切模量和摩擦，以及在实践中常用的级配良好的桑迪砾石土的膨胀角显着高于在三轴压缩应力路径中测量的。现有的经验和修改的应力-应变关系式提出的低围压低估了观察到的膨胀响应，但是，另一种常见的经验方法似乎足以捕捉的应变。本文报告的数据应有助于从业人员估计平面应变行为的桑迪砾石混合物。
The strength and stress-dilatancy of uniform sands has been studied extensively in geotechnical investigations, and practitioners can draw on a wealth of previously reported data for the estimation of their volumetric response. However, the suitability of accepted stress-dilatancy theory and empiricism has not been evaluated for well-graded gravelly soils. Axisymmetric, isotropically consolidated drained compression, and pure shear, plane strain quasi-K0 consolidated drained tests were performed on well-graded Kanaskat gravel using confining pressures ranging over three orders of magnitude to determine its stiffness, strength, and stress-dilatancy response. The plane strain stiffness, strength, and stress-dilatancy of Kanaskat gravel is observed from tests performed using a large cubical true-triaxial device with flexible bladders. The observed response is interpreted with a view of experimental boundary conditions and their impact on the volumetric response. The observed plane strain shear modulus and friction, and dilation angles of well-graded sandy gravel soils commonly used in practice are significantly higher than those measured in the triaxial compression stress path. Existing empirical and modified stress-dilatancy expressions proposed for low confining pressures underestimate the observed dilation response; however, another common empirical approach appears to adequately capture the dilatancy. The data reported herein should help practitioners estimate plane strain behavior of sandy gravel mixtures.