Analysis Of Highway Soft Soil Foundation Treatment And Settlement

With the rapid development of China's economy,the scale of construction of highgrade highways continues to expand.During the construction of the road,due to the long line along the road,its striding across the stratum is complex and variable,and it is inevitable that it will encounter soft soil foundation.Due to the special nature of soft soil formation,it often exists in deep soil layer.During construction,it must be properly treated according to requirements and specifications.If the soft soil foundation is not properly treated,it may cause uneven settlement or even instability of the roadbed.Phenomenon,the possibility of cracks and collapse on the road surface,reducing the safety and reliability of the road.High-quality treatment of soft soil foundation greatly improves the bearing capacity of the roadbed,and also provides an important guarantee for the safe operation of the road after completion.Based on the research status at home and abroad,the characteristics of soft soil and common treatment methods are analyzed and analyzed,and the construction technology and construction cost are compared and analyzed.The deformation mechanism,regularity and settlement process of soft soil foundation are analyzed.The soft soil foundation is treated by PLAXIS finite element software to simulate the construction process,and the influence of different factors on the foundation settlement is analyzed.Concluded as follow:First,Based on the highway construction project of Wu'an City,the PLAXIS finite element is used to simulate the riprap-squeezing and silt road section,and the numerical simulation results are basically consistent with the actual monitoring results;Second,The simulation analysis of untreated and riprap crushing treatment by finite element PLAXIS shows that the foundation settlement,horizontal displacement and void water pressure are reduced after squeezing and squeezing,which effectively improves the foundation.Carrying capacity to accelerate foundation consolidation;Third,Analysis of different influencing factors based on finite element PLAXIS.The thickness,width,modulus and cohesion of the riprap are analyzed.The results show that the thickness has a greater influence on the settlement,the width is second,the modulus and cohesion are less affected,and even negligible;The modulus,thickness and permeability coefficient are analyzed.The results show that the larger the sludge modulus is,the smaller the settlement of the roadbed is;the larger the sludge thickness is,the larger the settlement of the roadbed is;the two have a great influence on the settlement of the roadbed.The influence coefficient of the permeability coefficient of the silt on the settlement of the roadbed is small;the height of the roadbed filling and the filling speed are analyzed.The results show that the filling height has a great influence on the settlement of the subgrade,and the filling speed of the subgrade is different.The influence of the quantity is small;changing the different slopes,the settlement change value is small under the premise that the subgrade height is small.