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黄土三轴试验的颗粒流数值模拟

, PP. 22-29

Keywords: 道路工程,黄土,三轴试验,颗粒流,数值模拟

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Abstract:

？采用三维颗粒流软件(PFC3D)对陇西地区相同含水率、不同围压和相同围压、不同含水率条件下(含水率为20%时,围压分别为0,50,150,300kPa;围压为100kPa时,含水率分别为2%,6.5%,13%)的黄土三轴固结不排水剪切试验进行了数值模拟,并与室内试验结果进行对比,得到了宏观的应力-应变曲线、应变能-轴向应变曲线以及微观的颗粒间应力场、位移场的变化规律。研究结果表明:法向刚度控制宏观变形模量,法向刚度与切向刚度之比控制泊松比,摩擦因数控制峰值强度,粘结强度控制不同含水率下抗剪强度中粘聚力大小;研究结果较全面地描述了黄土三轴试验从宏观到微观的全过程。

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