含泥量对填砂路基动态模量的影响

Effect of Soil Content on Dynamic Modulus in Filling Sand Subgrade

为掌握含泥量对填砂路基动态模量的影响规律，先通过现场便携式落锤式弯沉仪（PFWD ）试验与压实度试验，分析了含泥量与填砂路基动弹性弹模量的关系；再结合现场检测数据，建立了动态模量随压实度、稠度和含泥量变化的回归模型；最后，结合现场检测与室内PFWD试验结果，提出了填砂路基含泥量的控制标准。研究表明：现场检测路段填砂路基含泥量绝大部分在3．0％～5．5％之间，现场动态模量随含泥量增大而减少，二者具有良好的幂函数回归关系；现场的动态模量与压实度、稠度和含泥量也具有良好的回归关系；当含泥量为0～10％时，随着含泥量的增加，路基动态模量呈先增大后减小的趋势。当含泥量较小（含泥量小于3％）和较大（含泥量大于8％）时，其动态模量要明显小于其他含泥量下的动态模量。当含泥量在3％～8％范围时，动态模量变化幅度较小，故建议含泥量的控制标准为3％～8％。

To analyse the effect of the soil content on dynamic modulus in filling sand subgrade ,the portable falling weight deflectometer （PFWD） test and degree of compaction test in field were carried out at first . The relationship of the soil content and the dynamic modulus was analysed as well .Based on the test data , the regression models among the dynamic modulus ,degree of compaction ,consistency and the soil content were established .Then combining with the out-and-indoor test results ,the controlling standard of soil content in filling sand embankment was presented . The results turn out that the soil content in the embankment is 3 .0% ~5 .5% .The dynamic modulus increases with the soil decreasing ,and there is a good power function regression between them .There is also a good regression among dynamic modulus ,degree of compaction ,consistency and soil content .When the soil content is within 10% ,the dynamic modulus increases then turn to decrease with the soil content increasing .When soil content is smaller than 3% or larger than 8% ,the dynamic modulus are significantly smaller than others .So the controlling standard of soil content in filling sand embankment is recommended at 3% ~8% .