Soft Ground Abutment Stability Control And On-site Monitoring Technology Research

When the abutment is built on deep soft ground, soft soil' horizontal movement and consolidation will take place under the pressure of the high embankment behind the abutment, which can weaken the abutment stabilization and bing it various diseases if effective measures fail to be taken, such as the girder can be not fixed, the abutment deform badly,and piles are broken in the course of construction and management.Based on monitoring the Wenzhou Abutment of the Duiwushan Bridge of Wenzhou-Fuzhou Railway during its constructing, the paper carrys through the research on stabilization of the abutment on deep soft ground and under high embankment as follows:(1)According to relational literatures, the current research situation of embankment lateral effects on the piled bridge abutment on soft clay is analyzed. The field monitoring results and centrifuge model tests of the piled bridge abutment on soft ground, finite element analysis of the soil-pile interaction and various computation techniques of the lateral earth pressure acting on the piles from horizontal soil movements are summarized.(2)The aspects of the high-filling embankment action for the abutment stabilization are summarized, the methods of the additional horizontal soil pressure and the negative friction on the abutment piles are discussed and compared.(3)The causes and forms of the abutment diseases are analysed, the key effect factors and the control measures of the abutment stabilization are summarized by the numbers.(4)The Duiwushan Bridge' Wenzhou Abutment field monitoring are carried out, the monitoring fruit is analysed.(5)A three-dimensional finite element approach is described for analysis of pile groups influenced by lateral soil movements from the approach embankment, which concludes some rules about the abutment piles in the soft soil.