Research on the construction technology of widening loess subgrade with full-scale model test
Qu Zhi · Journal of Baoji University of Arts and Sciences · 2012
Aim To investigate the deformation rule and relevant construction technology of widening loess subgrade by full-scale model test.Methods According to the components of the incoordination deformation,the key points of construction control and construction methods is made clear through the treatment of the combination surface of the new and old subgrade and the control of degree of compaction of the widening subgrade surface as well as the reinforced treatment of the combination surface of the new and old subgrade and the detection technology for widening subgrade.Results The results showed that: 1) The designed compaction effect can be reached when the best paving layer thickness of widening subgrade is 20 cm and the times of compaction is 8 to 10 times;2) In roadbed filling,the optimum moisture content and the maximum dry density of lime soil shall be 13.7% and 1.87 g/cm3,respectively;the optimum moisture content and the maximum dry density of loess is 12.3% and 1.95 g/cm3,severally;3) Modulus of resilience of lime soil subgrade was significantly higher than that of loess subgrade,it better achieved the simulation of the characteristics of settlement deformation of the new and old roadbed materials.Conclusion The achievement in the research on the model test of construction technology can make people further understood the construction process and construction methods of widening subgrade and be helpful for the selection,design and construction of any other treatment measures for widening subgrade.