红层填料分数维与水理特性相关性研究

Study on the Correlational of the Hydrogical Properties and Fractal Dimension of Red Beds Filling Material

红层填料的现场耙压施工中的重复"压碎-翻松"过程具有自相似特征,因此所得破碎产物的粒度特征可用分数维描述.基于填料破碎的分形机理,构造了利用室内试验设备模拟现场耙压工艺破碎填料方法,进而研究了重复"压碎-翻松"过程中不断破碎的红层填料分数维变化规律.在此基础上,制备不同分数维填料,用于研究粒度特征对填料压实效果和水理性质的影响.研究结果表明,在相同的压实参数下,填料分数维越大越容易压实;具有相同压实度的填料,其分数维越大,浸水膨胀量越小,压缩性能越低.基于填料崩解性和分形理论,分析了其中机理.成果在一定程度上揭示了粒度特征对红层填料水理性质影响的规律.

The compaction of the red beds filling material with repeating＂crush-scarifying＂ process in site has the property of self-similar characteristics, therefor the particle characteristics of resulting crushed products could be described by fractal dimension. Based on the fractal mechanism of repeating crush process, the method using laboratory test equipment to imitate the crush process in site was created, then the variation law of fractal dimension on the red beds filling material produced by＂crush-scarifying＂process was studied.Then,the inflence of partical characters on compaction and hydrogical properties was studied on the filling material with different fractal dimention, which were prepared with the method.The results show that for filling material within the same compaction parameters, the bigger fractal dimension the ma- retail is, the easier it could be compacted; within the same compaction of the filler, the bigger fractal dimen- sion, the fewer soaking expansion and the lower compression performance the material is.To a certain extent, this paper reveals the rule of the red beds road construction affected by the particle characteristics.