| Soft foundation soil layer is usually composed of silty clay and silt,which makes it often have poor permeability and high water content,but also makes its shear strength low and compressibility very high,which makes the surrounding Expressway easy to settlement and deformation,and causes this problem mainly because the excess pore pressure can not be dealt with in time.Highway construction safety and operation safety leave a greater hidden danger.Therefore,it is very important to strengthen the soft foundation treatment of the expressway around the city.In this study,taking the Ring-City Expressway in A city as an example,the damage forms of its soft soil foundation are investigated and studied.Based on the existing treatment measures,the existing difficulties and difficulties during the treatment period are analyzed.Based on this,the corresponding key treatment technologies are put forward,and the corresponding design schemes are formulated based on the actual situation of the project.Finally,this study draws the following conclusions:(1)Settlement deformation and roadbed instability are the main factors affecting the soft soil foundation of Huancheng Expressway.In the construction of this project,it is necessary to deal with the excess pore pressure to help it dissipate quickly,so as to achieve the control of settlement and deformation and the improvement of stability.(2)Reinforcement method and cushion method can better improve the stability of subgrade;gravel pile method and drainage consolidation method can better improve the speed of drainage consolidation,and help to improve the stability of subgrade.Based on the expressway around the city,this paper puts forward the corresponding soft foundation treatment system and scheme,which provides important guidance for similar projects. |
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