Study On Treatment Scheme Selection And Deformation Of Soft Soil Foundation In Anjiu Highway

When constructing highways,it is inevitable that some soft soil foundations will be encountered,especially in areas with many coastal areas and many lakes.Soft soil foundations are particularly common.Embankment settlement and instability is a common problem encountered in engineering.How to solve the settlement problem caused by soft soil foundation during road construction and improve the stability of the foundation is an urgent matter to be solved.This paper combines the research status of soft soil foundation at home and abroad,analyzes the cause,distribution and treatment methods of soft soil,and relies on the soft soil engineering data of the K195-K395 section of the Anjiu Phase II highway project.Analyze the general situation of the project,using the combination of analytic hierarchy process and expert scoring method,from the six aspects of cost,construction period,treatment effect,environmental impact,construction difficulty and mechanical equipment,three commonly used cement mixing piles,pipe piles and plastic drainage plates The soft base processing method was calculated and analyzed by calculating the total ranking weight value of ten experts.The results show that cement mixing pile is the best treatment plan for this soft soil foundation.In this paper,the PLAXIS finite element software is used to numerically simulate the construction process of the K195-K395 section,analyze its settlement and the lateral displacement at the foot of the embankment,and compare it with the monitoring value of the project.Finally,the cement mixing pile The influences of pile spacing,pile length,pile stiffness,sand cushion and geogrid on foundation settlement and lateral analysis are analyzed,and the following conclusions are drawn:(1)Through the numerical simulation of PLAIXS finite element before and after the treatment with cement mixing piles,the results show that: the cement mixing piles can effectively strengthen the soft ground and improve the bearing capacity of the soft ground,so that the settlement value and lateral displacement of the foundation are greatly increased.Decrease;with the embankment filling,the settlement value and lateral displacement also increase.(2)Through comparative analysis with the monitoring data in the project,it can be found that the results of the numerical simulation by the PLAXIS finite element software are slightly different from the results of the engineering monitoring.This is due to the simplified model,but the overall trend It is basically consistent,indicating that thesimulation of PLAIXS finite element software is feasible.(3)The pile spacing,pile length,pile stiffness,sand cushion and geogrid and other influencing factors of the cement mixing pile are analyzed.The results show that the pile spacing has little effect on the settlement value and lateral displacement.As the spacing decreases,the settlement value and lateral displacement increase accordingly;the length of the pile has a greater impact on the settlement value and lateral displacement.The larger the length,the smaller the settlement value and lateral displacement;the settlement value and the lateral displacement will increase with The stiffness increases and decreases,but the change is not obvious;the sand cushion and geogrid both suppress the settlement value and lateral displacement,but the sand cushion mainly has a significant effect on reducing the settlement value.The lateral displacement suppression effect is better.Figure 37 table 20 reference 32...