| The baoji-hanzhong expressway passes through the qinling mountains,and the geological conditions are complex and changeable.The geological diseases along the route are extensive and serious.The lack of carrying capacity of weak foundations and uneven settlement have seriously affected the stability of the highway and the safety of driving.In order to make the bearing capacity of Baoji-Hanzhong Expressway meet the needs of vehicle traffic,this paper puts forward the method of combining dynamic compaction with soil solidifying agent to treat the weak foundation along the highway,and carries out settlement detection and foundation treatment effect evaluation for the treated section.The research conclusions are as follows.(1)According to the geological conditions and construction conditions of Baoji-Han zhong Expressway,the soft foundation along the highway is treated by dynamic consolidation combined with soil solidifying agent.The specific technical parameters,construction technology and construction points of the soft foundation treatment construction are put forward.(2)The California Bearing Ratio(CBR),modulus of resilience and subsidence of the foundation are studied by using in-situ bearing plate test and in-situ loading preloading test.The relationship between the parameters of soil moisture density,moisture content and compactness of the foundation and the subsidence of the foundation is analyzed.(3)The test results show that the combined treatment method of dynamic compaction and soil solidifying agent is an effective measure to deal with soft foundation.The combined treatment method can not only effectively improve the bearing capacity of soft foundation,strengthen the overall stability of roadbed,but also improve the construction efficiency and reduce the project cost. |
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