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首页> 外文会议>International Center for Aggregates Research 6th Annual Symposium Proceedings; Apr 19-21, 1998; St.Louis Missouri >ANISOTROPIC BEHAVIOR OF UNBOUND AGGREGATE BASES: State-of-the-Art Summary on Anisotropic Behavior
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ANISOTROPIC BEHAVIOR OF UNBOUND AGGREGATE BASES: State-of-the-Art Summary on Anisotropic Behavior

机译：非约束聚集基础的各向异性行为：各向异性行为的最新摘要

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摘要

Recent studies conducted at the University of Illinois have shown that unbound aggregate bases typically exhibit anisotropic behavior due to compaction and subsequent load induced stiffening in the vertical direction. Both the effects of anisotropic resilient stiffnesses and the dilative behavior under a single wheel have been successfully modeled using a nonlinear cross-anisotropic constitutive relationship in the granular base. Unlike the commonly used isotropic model, a cross-anisotropic representation has different material properties assigned in the horizontal and vertical directions. Correct modeling of stress states considering the existing locked-in residual stresses is essential, not only for describing the dilative behavior but also for reducing/eliminating the significant tensile stresses often predicted in unbound aggregate bases. Laboratory studies need to be conducted for the purpose of providing input data for the analysis of anisotropic stress dependent granular material behavior in the finite element programs. Specimen radial displacement measurements (presently not taken under standard modulus test procedures) are essentially required from the repeated load triaxial tests for evaluation of the anisotropic dilative behavior. More elaborate testing is also needed for modeling of response to rolling wheels, which requires rotation of principal planes and inelastic and dynamic interpretations of the data.
机译：伊利诺伊大学进行的最新研究表明，由于压实以及随后的载荷在垂直方向上引起的变硬，未结合的骨料通常表现出各向异性。各向异性弹性刚度的影响和单轮下的扩张行为都已使用颗粒基础中的非线性交叉各向异性本构关系成功建模。与通常使用的各向同性模型不同，交叉各向异性表示在水平和垂直方向上分配了不同的材料属性。考虑到现有的锁定残余应力，对应力状态进行正确建模至关重要，这不仅对于描述膨胀行为，而且对于减少/消除通常在未结合骨料基料中预测的显着拉应力也至关重要。为了提供输入数据以分析有限元程序中各向异性应力相关的粒状材料行为，需要进行实验室研究。反复进行三轴载荷试验以评估各向异性的膨胀特性，基本上需要进行试样径向位移测量（目前不在标准模量试验程序下进行）。为了对滚轮的响应进行建模，还需要进行更精细的测试，这需要旋转主平面以及对数据进行非弹性和动态解释。

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