Micro-destructive assessment of subgrade compaction quality using ultrasonic pulse velocity  

作　　者：Xuefei Wang Xuping Dong Xiangdong Li Jianmin Zhang Guowei Ma Jiale Li 

机构地区：[1]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin,China [2]Department of Hydraulic Engineering,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第11期4782-4797,共16页岩石力学与岩土工程学报（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.52038005 and 52278342);Natural Science Foundation of Tianjin,China (Grant No.23JCJQJC00160).

摘　　要：The ultrasonic pulse velocity(UPV)correlates significantly with the density and pore size of subgrade filling materials.This research conducts numerous Proctor and UPV tests to examine how moisture and rock content affect compaction quality.The study measures the changes in UPV across dry density and compaction characteristics.The compacted specimens exhibit distinct microstructures and mechanical properties along the dry and wet sides of the compaction curve,primarily influenced by internal water molecules.The maximum dry density exhibits a positive correlation with the rock content,while the optimal moisture content demonstrates an inverse relationship.As the rock content increases,the relative error of UPV measurement rises.The UPV follows a hump-shaped pattern with the initial moisture content.Three intelligent models are established to forecast dry density.The measure of UPV and PSO-BP-NN model quickly assesses compaction quality.

关 键 词：SUBGRADE Compaction quality Ultrasonic pulse velocity(UPV) Intelligent model Proctor test Micro-destructive evaluation 

分 类 号：P618.13[天文地球—矿床学]