Subgrade resilience modulus measuring by portable falling weight deflectometer(PFWD)
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摘要: 应用便携式落锤弯沉仪(PFWD), 研究了动弹性模量与压实度和含水量的关系, 得出动弹性模量与静弹性模量、压实度和含水量相关系数大于0 85, 动弹性模量最大值在最佳含水量附近, 这与实际情况相符。结果表明, PFWD可用于路基回弹模量的快速检测和评价。Abstract: This paper studied the relationships of dynamic elastic modulus with compaction, and moisture content with PFWD. It was pointed that the obtained satisfactory correlations of dynamic elastic modulus with static elastic modulus, compaction with moisture content are over 0.85, the maximum value of dynamic elastic modulus is near by the optimum moisture content, which is agreetment with the real situation. The result shows it is feasible to measure and evaluate subgrade resilience modulus with PFWD.
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Key words:
- subgrade engineering /
- resilience modulus /
- PFWD /
- compaction /
- moisture content
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图 3 含水量与动弹性模量关系
Figure 3. Relationship of moisture content and dynamic elastic modulus
表 1 土的物理性质
Table 1. Physical characteristics of soil
土质类型 液限wL/% 塑限wP/% 塑性指数IP 最佳含水量wo/% 最大干密度ρd/ (g·cm-3) 砾石土(CLS) 39.1 22.5 16.6 9.68 2.057 红粘土(CHS) 51.1 27.2 23.9 15.66 1.856 
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