The compaction quality of soil is an important factor to determine the long-term stability of highway,railway and airport runway.Conventional methods for the quantification of subgrade compaction quality are almost based on random sampling method.The evaluation of the compaction uniformity is all based on the univariate parameters,such as the deviation coefficient.However,these parameters are unable to consider the spatial distribution of the collected data and evaluate the non-uniformity of the compaction state.Based on the semivariogram model,the new uniformity descriptor UV is suggested to quantify the compaction uniformity.The PFWD system is adopted to measure the compaction degree of the earthwork.Both the conventional uniformity descriptor and the proposed new uniformity descriptor are adopted for uniformity assessment.The results indicated that,compared to the conventional uniformity descriptor CV,the proposed new uniformity descriptor UV is able to provide a more objective evaluation on the spatial non-uniform distribution of the subgrade compaction state.It is proved to be a new method to evaluate the compaction quality for subgrade compaction woks.%土体压实质量是决定公路,铁路,机场跑道等土工构造物长期稳定性的重要因素.目前压实质量检测方法主要是传统的局部取样点测法,在进行压实质量均匀性评价时,多采用变异系数概率统计指标CV作为评价指标,未能考虑检测数据的空间变异特性,难以从空间分布的角度评价路基压实质量的不均匀性.基于半变异函数模型,提出能够评价压实度空间分布的均匀性指标UV.以PFWD检测指标为计算对象,分别采用新旧两种均匀性评价方法对某客运专线试验段路基的PFWD检测结果进行压实均匀性评价.结果表明:与旧指标CV相比,新指标C更能客观反映填筑路基压实度在空间上的不均匀性,其结果为路基压实均匀性评价提供了新的思路.
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