碎石桩复合地基沉降及应力现场监测研究

Field Testing Study on Settlement and Stresses of Gravel Pile Composite Ground

客运专线对路基的设计要求更体现在对路堤变形的严格控制。以某客运专线DK61为工点,对采用碎石桩处理的复合地基的沉降规律和应力变化进行了现场监测,得到了路堤施工过程中及施工完成后的地基沉降、土应力以及孔隙水压力等监测数据,在此基础上通过对现场测试结果进行了整理和分析,研究了路堤在施工过程中与工后的地基沉降的规律和现场施工条件下复合地基沉降变形影响因素,对路基沉降进行了预测,并论证了地基土压力和孔隙水力的受力机理,这些研究成果为今后进一步进行的理论研究和工程设计提供了有益的依据。

Design of Passenger Dedicated Line roadbed is on more reflected strict control on the embankment deformation.In the DK61 site of some railway line where soft clay foundation was used by gravel pile treatment,field monitoring of settlement and stress for composite ground was conducted on-stress variation,so data of settlement of embankment and foundation,soil pressure and pore water pressure have been obtained in the process of construction and after construction of the embankment.On the basis of the arrangement and analysis of the results in the field testing,the settlement of composite foundation during the construction and after construction of embankment,influence factors of settlement of composite ground under field construction conditions and settlement prediction rules has been studied,and it has statistically argued stress mechanism of soil pressure and pore water pressure.These research results provide useful information for theoretical research and engineering design in the further.