李慎刚, 石云方, 刘晋宁, 蒋琛. 碎石土路基填料压实及渗透特性研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.28.002
引用本文: 李慎刚, 石云方, 刘晋宁, 蒋琛. 碎石土路基填料压实及渗透特性研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.05.28.002
Research on Compaction and Permeability Characteristics of Gravel Soil Roadbed Filler[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.28.002
Citation: Research on Compaction and Permeability Characteristics of Gravel Soil Roadbed Filler[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.05.28.002

碎石土路基填料压实及渗透特性研究

Research on Compaction and Permeability Characteristics of Gravel Soil Roadbed Filler

  • 摘要: 为揭示碎石土路基填料在压实及渗透过程中颗粒破碎、流失规律,对不同含石量及含水率的碎石土试样进行击实及击实后的渗透试验。结果表明:对于碎石为硬岩、细颗粒为砂类土的碎石土试样,在含石量为60 %时,达到最优击实效果,干密度随含水率的增大先增大后减小,渗透系数与干密度的变化趋势相反;击实破碎前后的粒径分布具有良好的分形特征,分形维数D与干密度呈现正相关,随含水率的增大先增大后减小,在最优含水率处达到最大值,破碎最优分形维数D为粗颗粒2.23~2.25、细颗粒2.43~2.45;破碎率Bg与分形维数D也有良好的线性关系,含石量不超过60 %时,粗、细颗粒的分形维数D均随颗粒破碎率Bg的增加而增加;渗透侵蚀对分形维数D的影响受含石量的影响较大,60 %含石量时,分形维数差值随含水率的增大先减小后增大,与渗透系数的变化趋势相同,含石量超过60 %时,分形维数差值的变化幅度明显减小。含石量和含水率是影响颗粒破碎、流失的两个重要因素,但相对于含水率而言,含石量对颗粒破碎、流失的影响更加显著,分形维数D与各配比试样的击实、渗透试验结果的相关性良好,能够较好的反映碎石土试样的压实及渗透特性。研究成果可进一步揭示碎石土路基的压实机理,也可为路基工程施工提供参考。

     

    Abstract: Abstract: In order to reveal the rule of particle breakage and loss of crushed stone soil subgrade filler in the process of compaction and seepage, crushed stone soil samples with different stone content and water content were compacted and the compacted seepage test was conducted. The results show that the best compaction effect is achieved when the stone content is 60% for gravelly soil samples with hard rocks and fine particles as sandy soil. The dry density first increases and then decreases with the increase of water content, and the change trend of permeability coefficient and dry density is opposite; The particle size distribution before and after compaction and crushing has good fractal characteristics. The fractal dimension D is positively correlated with the dry density. With the increase of water content, it first increases and then decreases, reaching the maximum at the optimal water content. The optimal fractal dimension D for crushing is 2.23~2.25 for coarse particles and 2.43~2.45 for fine particles; There is also a good linear relationship between the crushing ratio Bg and fractal dimension D. When the stone content is not more than 60%, the D of coarse and fine particles increases with the increase of Bg; The influence of seepage erosion on D is greatly affected by the rock content. When the rock content is 60%, the difference of fractal dimension decreases first and then increases with the increase of water content, which is the same as the change trend of permeability coefficient. When the rock content exceeds 60%, the change range of the difference of fractal dimension decreases significantly. Stone content and water content are two important factors that affect particle breakage and loss. However, compared with water content, stone content has a more significant impact on particle breakage and loss. The fractal dimension D has a good correlation with the compaction and permeability test results of each proportion sample, which can better reflect the compaction and permeability characteristics of gravel soil samples. The research results can further reveal the compaction mechanism of gravel soil subgrade, and also provide reference for subgrade construction.

     

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