摘要
采用格子Boltzmann方法(LBM)研究分析沥青路面裂缝的细观渗流特性,建立了压力梯度作用下复杂单裂隙面细观渗流的数值模型,然后使用光滑平板裂隙渗流的经典立方定律对模型进行了验证,并且讨论了沥青混合料裂隙面的粗糙度与弯曲度对其渗流特性的影响.结果表明:随着裂隙面相对粗糙度的增大,裂隙渗流明显偏离了立方定律;随着裂隙面弯曲度的增大,裂隙渗流与弯曲度的-3.8327次方成正比.最后,采用自行研制的可加围压的侧壁橡胶膜止水渗透仪测量沥青混合料裂隙面的渗透系数,并与立方定律实用修正公式的计算结果进行对比,结果发现两者误差较小,修正公式的计算结果更加准确合理,可以为路面水渗入率计算提供准确的基本参数,从而为路面排水设计提供有价值的参考.
Lattice Boltzmann method(LBM) was introduced into the seepage characteristic analysis of asphalt pavement crack. The mesoscopic seepage numerical model of complex single fracture surface under pressure gradient and corresponding calculation program were established,which were validated by the cubic law of smooth plate crack seepage. Based on the model and program,the influence of roughness and tortuosity of asphalt mixture crack surface on seepage was discussed respectively. The results show thatthe crack seepage deviates obviously from the cubic law with the increase of relative roughness. With the increase of the tortuosity,the crack seepage is proportional to its -3.832 7 power. Therefore,a permeability coefficient tester with applicable confining pressure side rubber membrane is developed,and the results are compared and analyzed through laboratory tests.The modified formula suggested is more accurate and reasonable,which can provide reliable basis for infiltration rate of pavement and valuable reference fordrainage design.
作者
钱尼贵
王端宜
厉淡宁
QIAN Nigui;WANG Duanyi;LI Danning(Guangdong Transportation Technology Testing Co.,Ltd.,Guangzhou 510550,China;Guangdong Hualu Transportation Technology Co.,Ltd.,Guangzhou 510420,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2019年第3期415-423,共9页
Journal of Building Materials
基金
国家自然科学基金面上资助项目(51278203)
广东省交通厅科技项目(2009-02-009)
