The Compaction effect is important for evaluating the subgrade construction. However, there is little research exploring the compaction quality of deep soil using hydraulic compaction. According to reinforcement effect analysis, dimensional analysis is adopted in this work to analyze subgrade compactness within the effective reinforcement depth, and a prediction model is obtained. A hydraulic compactor is then employed to carry out an in-situ reinforcement test on gravel soil subgrade, and the subgrade parameters before and after reinforcement are analyzed. Results show that a reinforcement difference exists inside the subgrade, and the effective reinforcement depth is defined as increasing compactness to 90% in the depth direction. Layered compactness within the effective reinforcement depth is expressed by parameters including the drop distance of the rammer, peak acceleration, tamping times, subgrade settlement, and properties of rammer and filler. Finally, a field test is conducted to verify the results.
Dandan Han — Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu, 210098, The People's Republic of China; School of Highway, Chang'an University, Xi'an, Shaanxi, 710064, The People's Republic of China
Zhijun Zhou and Haochen Zhan — School of Highway, Chang'an University, Xi'an, Shaanxi, 710064, The People's Republic of China
Jiangtao Lei — Division of Geotechnical Engineering and Geosciences, Department of Civil and Environmental Engineering, Polytechnic University of Catalonia (UPC), Spain
Minguo Lin — Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu, 210098, The People's Republic of China
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