The Settlement Monitoring And Calculational Methods Research Of Superhighway Foundation Treatment Transitional Belt

The superhighway roadbed associate with different treatment of soft foundation is easy to emerge some problems, these problems include the overrun of inconsistent settlement and grade.these not only affect the stabilization of foundation, but also affect the safety and comfort of travelling.So it is necessary to design transitional belt to decline inconsistent settlement step—by—step, and solve these problems at last. In recent years, theoretical research of these problems have been behind engineering practice.The treatment of soft foundation in transitional belt is right or not,that must be determined by more theoretic research and measure. So I would like to probe into this problem in this article with the help of FEM program Plaxis and data from measurement。The main works I finished are listed as follows:1) Introduce monitoring items in superhighway of soft land areas, then put forward the position of monitoring instruments for measuring settlement in transitional belt;2)Calculate the settlement of the Gibson soil under the crossband load and the superhighway separately with the help of Plaxis, then compare the result of calculation with the result of Gibson formula and measurement, at last we get the conclusion that is Plaxis is suitable for the calculation of settlement.In addition,computing data of Plaxis come from reconnaissance report.3) With the help of《Specifications for Design of Highway Asphalt Pavement》and other academicians' theory, I put forward the suggestion data of inconsistent settlement and grade which must be in allowance.4)Compare the result of calculation from Plaxis with the result of measurement, I get a conclusion that is the inconsistent settlement between one treatment and the other in the superhighway discussed in my article overrun, so it is necessary to set a transitional belt.5) When I use the FEM program Plaxis to calculate the settlement of the transitional belt with the treatment designed by designing institution, I find a difficult problem that is the length of piles in the transitional belt are shortening step—by—step, so I use equivalent length to calculate the settlement of a transect in the transitional belt .Then compare this result of calculation with desiring result, I get a conclusion that is the treatment in the transitional belt should be modified partly, then put forward a better treatment.