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胶结颗粒材料抗拉强度数值试验

Keywords: 道路工程,胶结颗粒材料,离散单元法,抗拉强度,平行粘结模型

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Abstract:

?为获得胶结颗粒材料细观参数对其抗拉性能的影响,基于离散元理论提出一种胶结颗粒材料单轴拉伸试验数值模拟方法。将数值模拟得到的胶结颗粒材料拉伸应力-应变曲线与试验结果进行对比,验证了数值模拟方法的可行性。采用该方法研究了颗粒粘结参数对平行粘结模型数值试样抗拉强度的影响,建立了给定颗粒尺寸和空隙率情况下的胶结颗粒材料抗拉强度数学预测模型,并根据颗粒粘结参数直接估计胶结颗粒材料抗拉强度。研究结果表明:采用平行粘结模型的数值试样能够较为准确地反映胶结颗粒材料的拉伸力学性状;在颗粒尺寸和空隙率不变的情况下,胶结颗粒材料的抗拉强度与粘结半径系数呈二次函数关系;粘结切向强度和粘结法向强度同步线性增大时,抗拉强度线性增大;粘结切向强度小于粘结法向强度时,抗拉强度随粘结法向强度增长的趋势减缓。

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