Rapid construction technology and compaction quality control of rock-filled roadbed
To analyze the compaction quality of stone-filled roadbeds using a rapid construction process,a three-dimensional soil foundation model of a rectangular prism is established using the finite element software ABAQUS.The mechanical response of stone-filled roadbeds compacted with 36-ton and 22-ton rollers under two different vibratory forces of 500 kN and 700 kN is simulated and analyzed.In the field test section,36-ton roller compactor are used to compact stone-filled roadbeds with loose thicknesses of 75 cm and 85 cm,while a 26-ton roller is used to compact a stone-filled roadbed with a loose thickness of 40 cm.Soil pressure is measured using soil pressure sensors,and compaction quality is controlled based on pore ratio and settlement difference.The results show that the stresses in the compacted roadbeds using 36-ton roller are 1.9 times and 1.5 times higher than those using 22-ton roller under the two different vibratory forces.Soil pressure is mainly generated by the vibration of the roller compactors,which decreases with increasing depth from the road surface.The decrease in soil pressure with depth becomes smaller as the depth from the ground surface increases.The field test results matches the numerical simulation results.After six passes of compaction by the roller compactor,the pore ratio of the roadbeds with both loose thicknesses is less than 22%.The recommended control index for settlement difference is 3.0 mm.The optimal working efficiency of compacting the roadbed with a loose thickness of 85 cm using a 36-ton roller is 60%higher than that of a 26-ton roller,leading to a 36%reduction in construction cost.
万方数据
维普
