Technolgies of Soft Soil Ground Treatment for New Line Introduced into Existing Passenger Dedicated Line Station
Based on the soft soil ground treatment project of the existing passenger dedicated-line station introduced by the new line,research on bag grouting pile test was carried out.The reinforcement effect of composite foundation with different grout ratios of bag grouting piles were analyzed,and the construction technology and quality inspection of bag grouting piles were studied.The results show that the mechanical equipment of the bag grouting pile is relatively low,has little impact on the existing railway line,which is suitable for the ground treatment project of adjacent operating railway lines with limited space.The problems encountered during the application of bag grouting pile technology in the classification of crushed stone filled soil foundation,such as bag breakage and hole collapse,which can be solved by improving the quality of the bag per unit area and using bucket type drill bit for hole drilling.When the grout mass ratio of cement : water : fly ash = 0.70 : 0.55 : 0.45,the average unconfined compressive strength of the pile body is 9.6 MPa,and the reinforcement effect is better than that of high-pressure rotary jet grouting piles.The use of low strain reflection wave method to detect the integrity of pile body has poor results,so the core testing of pile body should be strengthened in engineering applications.
railway subgradebag grouting pileon site testingground treatmentadjacent to operating railway line
万方数据
维普
