【作者】 唐文成；

【导师】 蒋军；

【作者基本信息】 浙江大学 ， 防灾减灾及防护工程， 2011， 硕士

【摘要】 桩承加筋土复合地基是以桩作为竖向增强体、以土工合成材料作为水平向增强体,两者协调共同工作的双向增强体复合地基。由于其在控制地基沉降、桩土差异沉降等多个技术经济方面的良好性能,近年来在软土地基处理工程中得到了广泛的应用。本文主要进行了以下几方面研究工作,并得到一些有价值的结论和成果：(1)对桩承加筋土复合地基的整体稳定性分析方法进行回顾总结,从理论上对其进行深入分析,同时提出了基于指标控制的桩承加筋土复合地基设计计算思路；(2)设计了柔性荷载作用下桩承加筋土复合地基稳定室内模型试验。根据多种方法计算复合地基的沉降并与试验量测得的柔性荷载作用下地基竖向沉降场进行对比。根据试验结果分析了复合地基的破坏滑移场和应力场,得到了加载过程中的桩身弯矩及桩土应力比的发展规律；(3)利用有限元软件Plaxis对柔性荷载作用下桩承加筋土复合地基稳定性影响因素进行模拟分析,研究各因素对复合地基稳定的影响程度,并将有限元模拟结果与试验结果相对比。更多还原

【Abstract】 Pile-supported and geogrid-reinforced composite foundation is reinforced by pile as vertical enhancing body and by geosynthetics as horizontal enhancing body, and both pile and geosynthetics coordinate and work together. Due to its good performance in control of foundation settlement and differential settlement and multiple technical and economical aspects, it has been widely used in soft soil foundation treatment engineering in recent years.This paper focused on the following aspects, and get some valuable conclusions and achievements:(1) The analysis method of overall stability of pile-supported and geogrid-reinforced composite foundation is reviewed and summarized, and it is further analyzed theoretically. Meanwhile the design and calculation thinking of pile-supported and geogrid-reinforced composite foundation based on index control was presented.(2) The indoor stability model test of pile-supported and geogrid-reinforced composite foundation under flexible load was designed. Calculated the settlement of composite foundation according to several methods, and compared with the vertical settlement field under flexible load measured in the test. According to the results of the test, the stress field and the stability performance of pile-supported and geogrid-reinforced composite foundation was intuitively analyzed. The rules of the bending moment of pile body and stress ratio between pile and soil was obtained during loading.(3) Factors influencing the stability of pile-supported and geogrid-reinforced composite foundation under flexible load was analyzed by finite element software Plaxis, and the influencing degree of the factors to composite foundation was studied. The results of finite element simulation were compared with experimental results.更多还原