High-Speed Railway Reinforced Soil Retaining Wall Long-term Performance Research

The reinforced soil retaining wall because of its good stability,simple construction,economic and beautiful features has been widely used in roads,railways,water conservancy and other engineering areas.With the continuous construction and popularization of high-speed railway in our country,the reinforced soil retaining wall has also been popularized and applied in high-speed railway subgrade.However,there are not many researches on reinforced soil retaining walls for high-speed railway at present.The service performance of the reinforced soil retaining wall under high-speed train load is not clear,so the long-term performance of the high-speed railway reinforced soil retaining wall needs to be studied and analyzed.In this paper,a combination of theoretical calculation,field data and numerical simulation is adopted.The main contents are as follows:(1)Introduced the reinforced soil retaining wall and its research status,through the understanding of the mechanism of its effect on the geogrid and soil,summarized the stress calculation and deformation theory of the reinforced soil retaining wall method,including the wall panel soil pressure,the wall back lateral soil pressure,base stress,tendon tension,horizontal deformation and settlement,and their relationship.(2)Based on the reinforced soil retaining wall of DK315+913 section of Rongcheng of Intercity Railway from Qingdao to Rongcheng,through the buried soil pressure cell,flexible displacement meter,single point settlement gauge and other components,according to the long-term monitoring data of 36 months after construction of the reinforced soil retaining wall,the vertical pressure,horizontal soil pressure,wall settlement,wall deformation and tendon strain of the reinforced soil retaining wall were analyzed.The distribution of stress and deformation was obtained.(3)The finite element model of the retaining wall was established by FLAC~3DD numerical simulation software,and the stress and deformation of the retaining wall were simulated from several different time nodes during the period of filling to 36months after the construction,and compared with the theoretical value and measured value for comparison.According to the results of theoretical calculation,data analysis and numerical simulation,the reinforced soil retaining wall of high-speed railway maintains its good structural stability during the service period,the deformation of the retaining wall and the strain of the tendons meet the requirements,indicating that the reinforced soil retaining wall subgrade structure suitable for high-speed railway.