气泡混合轻质填料路基的填筑质量测试与评估方法

Test and Evaluation Method for Filling Quality of Foamed Mixture Lightweight Filler Subgrade

为了评价气泡混合轻质填料路基的填筑质量,基于声波透射测试原理,依托实际工程开展了现场试验,选取波速、波幅和主频为评估指标,建立了气泡混合轻质填料路基的填筑质量测试与评估新方法.评估方法分两级:第1级根据评估指标判断现场路基填筑质量是否合格;第2级在路基填筑质量合格的基础上,根据以熵权法为基础的路基填筑质量均匀性评估模型,进一步评估路基填筑质量是否优良.研究结果表明:声测管布设间距为0.8 m时,气泡混合轻质填料路基的超声检测结果具有较好的稳定性和代表性;评估路基填筑质量是否合格时应采用波速最小值的95%作为波速低限值、波幅平均值的80%作为波幅低限值、主频平均值的86%作为主频低限值;根据路基填筑质量评估结果,试验段路基的填筑质量合格,填筑质量等级为良好.

To evaluate the quality of the foamed mixture lightweight filler subgrade,field tests were performed based on ultrasound technology in a practical project.Wave velocity,amplitude and main frequency were selected as evaluation indicators,and a novel method for detection and evaluation of foamed mixture lightweight filler subgrade was established.Evaluation method consisted of two steps:the first step judged whether the on-site subgrade was qualified by evaluation indicators;the second step evaluated quality grade of the qualified subgrade by entropy weight-based subgrade quality uniformity evaluation model.The results show that when testing distance is 0.8 m,the ultrasound test results of the foamed mixture lightweight filler subgrade are stable and representative.95%of minimum wave velocity,80%of average amplitude and 86%of average main frequency can be used as the low limits to judge whether the subgrade is qualified.The evaluation results show that the test section subgrade is qualified,and the subgrade quality grade is good.