Study On The Subgrade’s Differential Settlement Treatment Technology In Old Road Widening Of Yongdeng-gulang Highway

Early in China because of the rapidly,the growth rate of traffic volume of highway traffic volume has nearly saturated,the existing road rehabilitation and expansion has become inevitable.The old road widening expansion as the most direct and effective solution.Widen expansion and highway engineering in our country,there is no mature experience,the current specification for highway expansion widened less involved in the design and construction.Comparable to reconstruction of highway and the newly built highway engineering construction is difficult and complex process,high quality requirements,etc,and with the design of new construction projects of construction method cannot solve the problems we are facing.To solve the old road and ascends to the ancient sea highway using the problems existing in the period of design,improve the ancient expressway opened to traffic operation and posterior use performance,of old road widening is in urgent need of research,demonstrate,reasonable construction technology and engineering measures are put forward,to ensure the quality of project construction.Paper depends on the wing ascends to the ancient sea highway construction project of the old road widening project,the extensive data collection,analysis of old road widening both at home and abroad,on the basis of preliminary determined ancient highway old road widening project,in combination with indoor soil test parameters,the numerical analysis and the theoretical formula calculation,it is concluded that different ways of widening roadbed settlement regularity,in relying on the project along the old road using over-wet loess foundation scheme optimization,put forward suitable for wet and the loess area,the old road widening comprehensive engineering treatment measures and construction control key points.To verify the rationality of the design of old road widening,the old road widening subgrade cross-section embedding test components,post-construction settlement monitoring analysis.Permanent ancient highway engineering practice shows that the proposed large room used for the prevention and treatment of old road widening subgrade treatment scheme of longitudinal cracks in engineering application effect is good,is technically feasible,can be used for reference in the similar projects.