Experimental Investigation on Non-Darcian Flow in Unbound Graded Aggregate Material of Highway Pavement
Experimental Investigation on Non-Darcian Flow in Unbound Graded Aggregate Material of Highway Pavement
复制标题
公路路面无粘结级配骨料非达西流实验研究
DOI：
10.1007/s11242-016-0640-z
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发表时间：
2016-02
影响因子：
2.7
通讯作者：
Xu, Bo
中科院分区：
文献类型：
--
作者：
Dan, Han-Cheng;He, Lin-Hua;Xu, Bo
级配碎石基层在公路路面排水层中得到了广泛的应用。这种材料具有高渗透性，因此可以有效地排出通过路面裂缝渗透的水，减少相关的水损害。UGAB的渗透系数是描述UGAB中水流运动特性的关键因素，因此在公路排水工程设计中应首先考虑。本文通过恒水头渗透试验研究了UGAB材料的渗流特性。通过雷诺数分析发现，即使在相对较低的水力梯度下，UGAB材料中的流动也是非达西的。因此，达西定律不能直接用于确定UGAB的水力传导系数。基于Ergun方程，结合UGAB材料的典型粒径和孔隙率，给出了Forchheimer方程中系数的经验表达式，该表达式可用于UGAB材料导水系数的近似计算。最后，利用归一化目标函数分析法对该方法进行了验证。通过对比分析，对UGAB材料的渗透系数按不同级配和代表粒径（和）进行了排序。试验结果还表明，粒径和细颗粒（<0.075 mm）含量是UGAB材料级配设计的适宜指标。
The unbound graded aggregate base (UGAB) has been widely used in drainage layers of highway pavements. This kind of material is of high permeability and can thus drain efficiently the water infiltrated through cracks in the pavement and reduce the associated water damage. The hydraulic conductivity of UGAB is a key factor describing the water flow behavior in UGAB and thus be considered primarily in the design of highway drainage engineering. In this study, the flow behavior of UGAB material was investigated through constant head permeability experiments. Based on the Reynolds number analysis, it was found that the flow in UGAB material was non-Darcian even though under relatively low hydraulic gradient. Therefore, the Darcy law cannot be directly applied to determine the hydraulic conductivity of UGAB. Furthermore, the empirical expression of coefficients in Forchheimer equation, which can be available to evaluate hydraulic conductivity of UGAB material approximately, is presented incorporating the representative particle size and porosity based on the Ergun equation. Then, it was validated against the aid of normalized objective function analysis. Through comparison analysis, the sequencing of hydraulic conductivity of UGAB material was sorted quantitatively in terms of different gradation and representative particle size (and). The results also showed that theand the content of fine particles (<0.075 mm) are appropriate indexes for the gradation design of UGAB material in highway pavement engineering.
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影响因子：
1.4
作者：
DanHan-Cheng;XinPei;Liling;Liliang;LockingtonDavid
通讯作者：
DanHan-Cheng;XinPei;Liling;Liliang;LockingtonDavid
DOI：
--
发表时间：
2002
期刊：
Journal of Highway and Transportation Reseach andk Development
影响因子：
--
作者：
Ji Qing
通讯作者：
Ji Qing
影响因子：
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作者：
P. Venkataraman;P. Rao
通讯作者：
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影响因子：
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作者：
Marc Lebeau;J. Konrad
通讯作者：
Marc Lebeau;J. Konrad
影响因子：
2.4
作者：
Li Jian;Huang Guan-hua;Wen Zhang;Zhang Hong-bing
通讯作者：
Li Jian;Huang Guan-hua;Wen Zhang;Zhang Hong-bing