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首页> 外文期刊>European Journal of Environmental and Civil Engineering >Application of a flexible membrane to DEM modelling of axisymmetric triaxial compression tests on sands
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Application of a flexible membrane to DEM modelling of axisymmetric triaxial compression tests on sands

机译：柔性膜在沙滩上轴对称三轴压缩试验中的施用

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摘要

An innovative flexible membrane algorithm was developed and applied to the 3-D DEM modelling of axisymmetric triaxial compression tests on sands. This proposed flexible membrane was made of simply packed single spheres. The vertical and side extensions of the membrane were bounded by a series of boundary walls. These measures equipped the membrane with enough flexibility to contain local deformations of the cylindrical specimen which was comprised of un-bonded particles. With the application of the flexible membrane, the specimens failed with bulging shapes which were typical of axisymmetric triaxial tests. A comprehensive parametric sensitivity study indicated that the normal stiffness and particle size of the membrane spheres had limited influence on the test results, while the shear stiffness of the membrane spheres substantially enhanced the residual strength of the specimen. To examine the effectiveness of the flexible membrane algorithm, the numerical specimen was characterised on the macroscopic, mesoscopic and microscopic scales. The stress and strain response of the specimen well matched the laboratory test, and the volumetric strain presented apparent contraction and expansion stage. More importantly, the characterisation on the local void ratio clearly indicated the flexible membrane enabled full development of strain localisation inside the specimen.
机译：开发了一种创新的柔性膜算法，并应用于砂岩轴对称三轴压缩试验的3-D DEM模型。该提出的柔性膜由简单的单个球体制成。膜的垂直和侧延伸部分由一系列边界壁限定。这些措施配备了具有足够柔韧性的膜来含有由未键合颗粒组成的圆柱形样本的局部变形。随着柔性膜的施加，试样失效，凸出的形状是典型的轴对称三轴试验。综合参数敏感性研究表明，膜球的正常刚度和粒度对测试结果影响有限，而膜球的剪切刚度大大提高了样本的残余强度。为了检查柔性膜算法的有效性，数值样本的特征在于宏观，介性和微观尺度。标本良好匹配的实验室试验的应力和应变响应，体积菌株表现出明显的收缩和膨胀阶段。更重要的是，对局部空隙率的表征清楚地表明了柔性膜能够充分开发样品内部应变定位。

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