深厚软土桩网复合地基土工格栅变形分析

Analysis on geogrid deformation of deep-soft soil pile-net composite foundation

通过监测广东潮汕车站深厚软土地基沉降断面,建立了全断面有限元数值模型,分析了土工格栅在上部荷载作用下的拉力变化与变形大小,结果表明,土工格栅竖向位移沿整个路堤呈"盆形"分布,随着土工格栅刚度的增加,格栅拉力逐渐增大,拉力在桩帽边缘处最大,桩间次之,桩帽中心处土工格栅拉力最小;粗颗粒的垫层材料可以限制土工格栅的变形,进而均匀土工格栅拉力。

Through monitoring deep-soft soil foundation settlement section of Chaoshan station in Guangdong province, the paper establishes whole-section finite element numerical model, analyzes the pulling alteration and deformation of geogrid under upper loading action. Results show that ： vertical displacement of geogrid is basin-style distribution along the embankment ; With the geogrid rigidity increasing, the geogrid pulling force is gradually increasing ; the maximum pulling force is at the pile cap ; the medium pulling force is between piles ; the minimum pulling force is at the pile cap center; coarse cushion material can limit the geogrid deformation and balance geogrid pulling force as well.