The Selection And Effect Of The Road Foundation Treatment Plan In The Dredging Area

In the coastal area of Zhejiang China,there are distributed widely of deep muddy clay.Due to the needs of development and construction,the coastal area has a large area of land reclamation and land reclamation.The upper part of deep muddy clay is covered with deep blown sand layer and plain fill layer.This kind of soil layer has high water content,uneven soil quality,poor grading,high-pressure shrinkage,and poor bearing capacity of muddy clay foundation.The construction of this road is easy to cause excessive allowable bearing capacity of foundation,uneven settlement and excessive settlement,which will cause engineering problems,especially for high-grade road and in large reclamation area.The foundation will affecte the progress of the project and the investment,so it is a great significance for the construction of the project to select the appropriate foundation treatment scheme for this kind of project.Zhoushan green petrochemical base is located in Yushan Island,which is formed by dredging and reclamation.Because of the construction,the bridge section is under the Yushan Cross-sea Bridge,so the foundation treatment and reinforcement are needed.Therefore,under the background of the project of the bridge section under the Yushan Cross-sea Bridge,this essay is combined with the research on the soft soil foundation treatment methods at home and abroad,and the situation of land-forming by hydraulic filling in the Yushan island base,the bearing capacity and settlement of the foundation under different working conditions of high-pressure jet grouting piles and different materials of the foundation soil are calculated and analyzed,the optimal scheme of the foundation treatment is selected,and the Yushan Cross-sea Bridge is consolidated According to the settlement observation data of the subgrade in the lower bridge connection section,the actual settlement and the calculated settlement results are compared and analyzed,and the treatment results of the composite foundation with high-pressure jet grouting pile are reflected in combination with the specification requirements.The main contents of this essay are as follows:(1)Summarize the basic characteristics of dredger fill foundation,common treatment methods for dredger fill foundation at home and abroad,and put forward the results of the research institute of soft soil foundation treatment,and propose the use of high-pressure rotary jet piles for the foundation treatment of the lower bridge connection section of Yushan Cross-sea Bridge Program;(2)Summarize the relevant geological characteristics of Zhoushan area and the land fill survey report of the lower bridge connecting section of the Yushan Cross-sea Bridge,sort out the basic conditions of the road section where the project is located such as meteorology,hydrology,topography and site type,indicating that the section is filled with land fill The source is complex,and the spatial distribution of the dredger soil layer is uneven.The soft soil foundation treatment of gravel piles has been carried out on the lower part of the road of the connecting section.After the land is completed,there are many engineering vehicles on the upper part of the site,and the geological and soil conditions are complicated.(3)When the choice of roadbed filling materials is different and the treatment method of high-pressure rotary jet grouting piles for dredger fill ground is different,the calculation and analysis of the foundation soil bearing capacity and foundation settlement of the connection section are carried out by using the rational geotechnical software.(4)Collect and arrange the observation data of the subgrade settlement of the connecting section of the lower bridge of the Yushan Cross-sea Bridge,analyze the settlement rule of the connecting section,and compare and analyze with the numerical calculation results to obtain the treatment effect of the composite foundation of the high-pressure rotary jet grouting pile of the dredger fill foundation.This essay has typical significance in the coastal area of Zhejiang,and it can provide a positive reference value for the selection of the the road foundation treatment plan in the dredging area.