涡压挤扩机理应用于地基处理的室内试验研究

Laboratory Experimental Analysis of Foundation Treatment Using Vortex Squeeze Expansion Mechanism

分析了现有各种地基处理方法的优缺点,首次提出并经室内试验验证了涡压挤扩机理。使用自行设计制作的涡压挤扩环境箱和钢套管实施粘性土和砂性土的涡压挤扩试验,设置于钢套管内的涡压叶片可顺利地将其内部的流态混凝土挤扩到周围的土体中。定义了扩径比,测得不同扭矩条件下砂性土和粘性土的扩径比,并得到其极限扭矩。对涡压过程中混凝土可能出现的流动形态进行分析,建立混凝土流动分析模型,得到流态混凝土在涡压腔内的动力学模型。结果表明,采用涡压挤扩方法处理地基在理论上是可行的,具有较强的适用性,涡压挤扩方法将为地基处理行业注入新的活力。

The advantages and disadvantages of existing methods of foundation treatment were analyzed . The“vortex squeeze expansion mechanism” was proposed and tested in the laboratory .The self‐designed vortex squeeze expanding environment box and steel casing were used to implement the vortex squeeze expanding experiment .The vortex pressure blade in the steel casing can squeeze the flowing concrete into the surrounding soil medium smoothly .The expanded diameter ratio was defined .The expanded diameter ratio conditions of sandy soil and clay under different torque and the ultimate torque were presented .The concrete flow analysis model and dynamics model of concrete in the vortex pressure chamber was established based on the analysis of flow patterns that occurred during the vortex compressed concrete .The results indicate that it＇s feasible to use the method of vortex squeeze expansion to handle foundation ,it have strong applicability .Vortex squeeze expansion mechanism will bring new vitality for the foundation treatment methods .