单独使用碎石桩复合地基在提高软土地基承载力和减小变形方面效果较差.通过模型试验对土工格栅加筋砂垫层+碎石桩复合地基处理软弱地基进行了研究,在大量试验数据的基础上,对其承载机理和抗变形能力进行了较为详尽的理论分析,试验结果表明,土工格栅砂垫层+碎石桩复合地基能大幅度提高软弱地基的承载能力,且桩顶布置的土工格栅加筋垫层能够有效地分散荷载,减少地基沉降量. The use of gravel pile composite foundation alone is less effective in improving the bearing capacity and reducing the deformation of soft ground.We studied the treatment of soft foundation by geogrid reinforced sand cushion and gravel pile composite foundation through model test, Based on the experimental data, the bearing mechanism and deformation resistance are analyzed in detail. The results show that the geogrid sand + gravel pile composite foundation can greatly improve the bearing capacity of the soft foundation, and the pile The geogrid reinforced cushion arranged at the top can effectively disperse the load and reduce the settlement of the foundation.