条形基础下竖向布置纤维增强聚合物板材地基试验研究

Tests of Strip Foundation on the Grounds Reinforced by Vertical FRP

与传统加筋材料相比,FRP材料具有高强度和良好耐久性优势,因此它更适于用作加筋材料。完成了纯砂和5种竖向加筋方式的加筋地基模型试验,对比了不同加筋方式对地基承载力和地基沉降的影响,分析了每种加筋方式下FRP的应变及土压力的变化规律,据此探讨了FRP筋材的加筋机理。试验结果表明,不设横筋的加筋地基的加筋效果很小,加设横筋的竖向加筋地基的加筋效果明显,横筋、竖板高度、竖板间距对加筋效果的影响明显,地基的破坏模式均为土体剪切破坏,加筋存在深基础和扩散层两种机理。

Compared with traditional reinforcement,fiber reinforced polymer（ FRP） material has high strength and good durability advantages,so it is more suitable for use as reinforcement. Tests of pure sand and 5 kinds of vertical reinforcement type were conducted. The influence of different reinforcement types on settlement and bearing capacity of ground were compared. The variation law of FRP strain and earth pressure of each reinforcement type was analyzed,and the mechanism of FRP reinforcement was discussed. The test results shown that,the reinforcement effect of reinforced ground without transverse reinforcement was very small,while which was obvious for reinforced ground with transverse reinforcement. The influence of transverse ribs,height and spacing of vertical plate on the reinforcement effect was obvious. Ground failed becaused of earth shear. There were mechanism of deep foundation and the diffusion layer for FRP reinforcement.