Investigation Of The Governance Of Bumping At Bridge Approach At Soft Soil Foundation On National And Provincial Highway In Use In Ningbo

In recent years,Ningbo has kept increasing its investment in the construction of transportation infrastructure,especially in the governance of bumping at bridge approach on the highway in use.Based on the maintenance project of bumping at bridge approach at soft soil foundation on national and provincial highway in use in Ningbo,the present thesis briefly introduced the background of the issue of bumping at bridge approach in Ningbo at first,and then pointed out the danger of bumping at bridge approach as well as analyzed its reasons.Meanwhile,this thesis summarized the studies about the governance of bumping at bridge approach at home and abroad.Next,the thesis summarized the climate and characteristics of soft soil project in Ningbo.Having finished the investigation of diseases in some typical transition section between highway and bridge in areas like Yinzhou District and Zhenhai District,the thesis concludes some usual diseases and quantitatively analyzed those diseases.Then,the study analyzed the reasons for the sedimentation deformation of bridgehead roadbed and the generating mechanism of bumping at bridge approach.The transition section between highway and bridge was treated by placing method,foam concrete replacement and DGR craftsmanship.Finally,through detailed introduction of various special treatments and analysis of their settlement rules,the present study generalized the longitudinal slope and the diachronic developmental rules of settlement at transition section between highway and bridge.Through the contrastive study of settlement rules,the differences of settlement amount of various kinds of special treatments were acquired.At the same time,through the statistical analysis of the maximal settlement amount at both ends of the bridge under investigation and the differences of settlement longitudinal slope at the transition section between highway and bridge,their regression equation was inferred.According to the regression equation,the controlling value of the maximal settlement amount at transition section between highway and bridge under conditions of different speeds was obtained.Index curve predictive model and hyperbolic predictive model were applied to respectively match the practical settlement curves of placing method,foam concrete replacement and DGR craftsmanship with their modeling curves.The results showed that these two modeling curves were more effectively matched with the practical settlement curves at transition section between highway and bridge in Ningbo.The settlement amount of bridge head roadbed was controlled via a variety of special treatments.Placing method,foam concrete replacement and DGR craftsmanship were rather effective.This thesis may shed some light on the future governance of bumping at bridge approach at soft soil foundation on national and provincial highway in use in Ningbo.