地基系数K30评价公路路基压实度研究 |
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引用本文: | 黎卿. 地基系数K30评价公路路基压实度研究[J]. 路基工程, 2020, 0(4): 1-4. DOI: 10.13379/j.issn.1003-8825.201907055 |
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作者姓名: | 黎卿 |
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作者单位: | 珠海市规划设计研究院,广东珠海519000 |
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基金项目: | 珠海市规划设计研究院科研项目(2018KY-ZT16) |
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摘 要: | 采用平板荷载法测量地基系数K30,并与干密度ρ、车载式落锤弯沉仪(FWD)反算模量进行线性回归分析,相关系数R分别达到0.949和0.939,相关性均良好;进而采用地基系数K30与灌砂法所测压实度K进行线性回归分析,相关系数R达到0.957,相关性较高。地基系数K30能够直观地表征路基刚度和承载能力,且检测速度较灌砂法测压实度K更快,因而,为了保证路基的强度及变形指标,建议采用地基系数K30用于砂砾公路路基压实度的评定。
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关 键 词: | 平板荷载法 地基系数 压实度 干密度 FWD |
收稿时间: | 2019-09-20 |
Research on Evaluation of Highway Subgrade Compaction by Foundation Coefficient K30 |
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Abstract: | Herein plate loading method was used to measure foundation coefficient K30. The linear regression analysis was carried out by use of the dry density ρ and the back-calculated modular from car falling weight deflectometer (FWD), and the correlation coefficient R respectively reaches 0.949 and 0.939, showing good relevance; then the foundation coefficient K30 and the compactness K measured by sand replacement method were further used for the linear regression analysis, and the correlation coefficient R reaches 0.957, showing high relevance. The foundation coefficient K30 may directly manifest the stiffness and bearing capacity of subgrade and the testing speed is faster than the measurement of compactness K by sand replacement method. As a result, it is suggested to use foundation coefficient K30, for the purpose of ensuring strength and deformation index of subgrade, to evaluate subgrade compactness of gravel highway. |
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