双层土工网复合地基受压性状试验研究与分析

路堤下的桩体复合地基顶部常铺设一层或多层土工网,以增加桩体所承受的荷载及桩土应力比,形成桩 网复合地基或桩承堤,其设计从整体上仍处于经验阶段。采用在承压板内外侧设置百分表、在土工网下埋设土压力盒的方法,测试了土工网复合地基应力的平面分布、竖向扩散规律及随时间和沉降的变化规律,分析了强度变化与破坏模式,并对承载力特征值的取值标准提出了建议。本文结果为进一步的理论研究和工程设计提供了有益的依据。

Test Study and Analysis of Double-layer Geonet Composite Foundation's Working Performance

In order to increase pile's loading and pile-soil stress ratio,several layers of geonet are laid between embankment and the top of pile composite foundation and then the pile-net composite foundation or geotextile reinforced piled embankment is formed.At the present time,it's design is still at the stage of experience.By the method of installing extensometer inside and outside the plate,and laying earth pressure boxes under the double-layer geonet,the authors measured the regularity of the stress's horizontal distribution,vertical spread and change with time or settlement,analysed the strength variation and destruction model,and advised the determination standard of bearing capacity characteristic value.The test date provides useful information for theoretical analysis and engineering design.