CFG桩复合地基施工过程监测与数值分析

结合高速铁路某试验段工程,开展CFG桩+垫层处理地基试验。实测复合地基沉降变形、桩顶应力、桩间土应力;分析路基沉降变形、桩土应力比随填筑高度的变化规律;利用FLAC-3D建立路堤荷载下CFG桩复合地基三维参数化数值计算模型,将现场实测数据与数值计算结果进行对比,分析研究路堤荷载作用下CFG桩复合地基的工作性状。研究成果有助于高速铁路复合地基沉降控制、承载特性和应力传递机理的研究。

MONITORING AND NUMERICAL SIMULATION OF COMPOSITE GROUND WITH CFG PILES ON CONSTRUCTION PROCESS

Combining with the engineering project of the Test Section of the High-speed Railway,field tests of the composite foundation of CFG piles and cushion were carried out.Settlements of the composite foundation,stresses of the pile top,inter-pile soil were measured on site.The variation law of the pile and soil settlements of the subgrade and the pile-soil stress ratio with the changes of both the filling height of the embankment and the consolidation time was analyzed.The three-dimensional numerical model of the composite foundation with piles under the load of embankment founded by FLAC-3D.The measured data and numerical results were compared,and analysis the composite foundation with piles work traits.Research results can present important theory reference to the settlement control of soft soil roadbed and the study of the load-bearing characteristics and mechanism of stress transfer.