Analysis And Control Technology Of New And Old Roadbed Uneven Settlement

In recent years, China has carried out a number of highway expansion project, but a more general problem is that the new and old roadbed settlement of differences, and thus lead to more pavement and subgrade diseases, affecting driving comfort and quick, reducing road capacity, seriously affecting the economic and social benefits of the highway. Highway subgrade widening project to consider the differences between the new and old roadbed between Settlement and ensure effective connection between the new and old roadbed. Therefore, it is necessary to change the old and new highway extension difference subgrade settlement control technology and in-depth study.Based on the investigation of disease appeared to widen the road, and do a variety of diseases classified and summarized and analyzed the shortcomings of stability and deformation mechanism of two diseases arising from uncoordinated.The use of D-P geotechnical constitutive relation model of factors that cause uneven subsidence numerical analysis, specifically selected five main factors: the widening of the way and the width, the height of the embankment, New and Old Ground compression modulus, old subgrade modulus and the density of the new embankment, and came to the impact of each factor on the subgrade uneven sedimentation.Consider widening the road pavement to meet functional requirements, proposed differential settlement control indicators. Select typical pavement structure, calculation and analysis of subgrade uneven deformation under pavement structure layer can withstand bending tensile stress is proposed to broaden the variable slope rate uneven subgrade settlement acceptable result.Numerical analysis of lightweight embankment, excavation and stepped Treatment Geocell three kinds of measures for reducing the effect of differential settlement. The results showed that: Lightweight Embankment reduce the effect of widening the differential settlement of subgrade is more significant. In addition to Geocell own several parameters to do a detailed analysis of the effect of the economic considerations, it summarizes the most affordable Geocell selected program.