高填方地基土工离心模型试验技术研究

以模型试验的相似理论为基础,结合九寨黄龙机场高填方地基工程实例,详细阐述了高填方地基离心模型试验技术,即对九寨黄龙机场104 m高填方地基的离心模型试验,采用等应力局部模型设计方案,以剔除法和等量代替法配制填料,以等效法模拟软弱地基强夯处理,并以增大离心加速度的方法模拟高填方地基的填筑加载过程;试验结果表明,高填方地基的总体沉降特征为"沉降大、压实快";土体的压实沉降主要发生在施工期;试验中高填方地基施工结束时土体的沉降固结度已完成90%以上,施工结束后土体产生的沉降量还不到土体总沉降量的10%.

Centrifugal Model Technique of High Embankment

Based on the similar theory of model test and taking the high embankment of Jiuzhai-Huanglong airport as an example, the centrifugal model technique of the high embankment are represented in detail. The 104-meter-high embankment of Jiuzhai-Huanglong airport is modeled by some partial models with an equivalent stress.The filling stone and soil for tests are made by scalping method or mass balanced method.While the dynamic consolidation dealing with the soft ground is modeled by an equivalent method.The loading process of the high embankment is also modeled by increasing the centrifugal acceleration. The research results show that great settlement and fast compression are the main characteristics of high embankment, above 90% of settlement occurs during the construction, and below 10% after the construction.