土工格栅砂垫层与碎石桩复合地基承载试验研究

Bearing Capacity Model Test of Geogrid Reinforced Sand Blanket and Gravel Pile Composite Foundation

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.

It is poor to use gravel pile composite foundation alone to improve the bearing mechanism and decrease the deformation of foundation. In this paper,a model test on soft subsoil confined with geogrid reinforced sand blanket＋gravel pile composite foundation is presented. The bearing mechanism and the ability to resist deformation of the subsoil is studied in detail with the test data. The result of the test make it clear that the bearing capacity of soft soil can be improved by geogrid reinforced sand blanket＋gravel pile composite foundation and the sand blanket reinforced by geogrid can distribute the load effectively and decrease the deformation of foundation.