Treatment Scheme Of Silty Clay Roadbed Under High Water Level Optimization Research

With the continuous development of economic construction,more and more transportation infrastructures have been built,and road damage caused by geological disasters or existing soil problems has increased,causing huge economic losses.Therefore,ensuring the safety and stability of the roadbed is an important goal of highway construction.As the filling material of roadbed,soil is complex and diverse in nature due to different geological conditions due to its formation age and widely distributed.In highway engineering construction,it will inevitably encounter bad soil sections.Silty clay is a relatively common kind of soil.It is affected by factors such as long-term human activities,groundwater,freezing and thawing,and driving loads.It exhibits physical and mechanical properties of poor strength and water permeability,and roadbed is prone to damage and normal run.In this paper,the silty clay roadbed destruction of a certain park in Hunnan,Shenyang is the research object,combined with the current status of research on the treatment of unfavorable soil roadbeds at home and abroad,the physical and mechanical tests of the roadbed soil quality of the park’s destroyed roads are carried out,and the high water level silt The roadbed treatment plan uses FLAC 3D finite difference software to carry out numerical simulation calculation and comparative analysis on the roadbed,and the following conclusions are drawn:(1)In the numerical analysis where the replacement cushion method,the cement-soil mixing pile method and the sand well drainage consolidation method are representative treatment methods,vertical displacement,stress change and pore pressure change are used as comparison factors,and economic comparison analysis is carried out at the same time.It is determined that the cement-soil mixing pile method is the best treatment plan,and its settlement is reduced by about 91.36%compared with the original roadbed,and the influence of pore pressure and effective stress is small.(2)Through the analysis of the impact of the cement-soil mixing piles under different water levels,it can be seen that the settlement decreases with the increase of the water level.The pores of the soil are filled with water at 0m,and the total settlement is the smallest,indicating that the change in the water level is caused by the silty.The main reason for the settlement of the clay roadbed.(3)The results of the effect of different traffic loads on the subgrade treated with cement-soil mixing piles show that the vertical stress and settlement of the subgrade soil increase with the increase of the axial load,indicating that the damage of the silty clay subgrade is directly related to the heavy load overload.This study provides the best plan and calculation basis for the treatment and paving of silty clay roadbed in a certain park in Hunnan,Shenyang,and provides reference and reference for other similar projects.