土工格室碎石垫层-碎石桩复合地基相似模型试验

为深入研究土工格室碎石垫层-碎石桩复合地基这一新型多元复合地基加固体系的承载力和沉降变形机理,应用量纲分析法推导了土工格室碎石垫层-碎石桩复合地基模型试验的相似准则,根据相似理论设计和完成了3组具有可比性的模型试验,获得大量荷载-沉降、桩土应力比和应力分布数据。试验结果分析表明:在土工格室碎石垫层-碎石桩复合地基这一水平向-竖向多元复合地基共同作用的加固体系中,结合了土工格室碎石垫层的水平向增强体作用和碎石桩的竖向增强体作用;土工格室碎石垫层和碎石桩复合地基相互作用,共同工作构成的荷载传递和支撑体系是其提高承载力,减少沉降和差异沉降的主要机理。

Similarity Model Test of Geocell Reinforced Gravel Mattress and Gravel Pile Composite Foundation

To have a further study of the new type soft subgrade reinforcing system of geocell reinforced gravel mattress and gravel pile composite foundation of its mechanism of load capacity and settlement development,three comparative model tests were designed and carried out under the direction of similarity theory and similarity criterions deduced through dimension analysis method.Analysis based on a large amount of data about the load-settlement,pile-soil stress ratio and stress distribution obtained from the model tests shows that in the horizontal-vertical multiple reinforcing system,the horizontal reinforcing function of the geocell reinforced gravel mattress,the vertical reinforcing function of the gravel pile,the system of load transfer and supporting formed through interaction and working together mechanism between gravel pile composite foundation and geocell reinforced gravel mattress are the main mechanism of its load capacity improvement,settlement and asymmetrical settlement reduction.