株洲红层残坡积土填料力学性质研究

Research on mechanical properties of the filler with red bed residual slope soil in Zhuzhou

湘东地区大片分布着白垩系红层泥质粉砂岩与砂砾岩,当地工程建设回填整平时多采用红层残坡积土填料。为了查清红层残坡积土填料的物理力学性质,本文以株洲红层残坡积土为例,通过在不同压实状态和不同含水率下的土工试验,分析研究了红层残积土填料的力学特性。研究结果表明:红层残坡积土填料在较高压实状态下具有良好的抗剪性能和较低的压缩性,填料中的粗颗粒能在较低压实状态下快速提高填方工程中填土的内摩擦角,并能大幅降低填土达到较高内摩擦角时的压实系数,对提高填土的力学性质有较好的作用。研究成果对当地类似工程建设的安全性和经济性都具有积极作用。

The Cretaceous red bed argillaceous siltstone and sandy conglomerate are widely distributed in eastern Hunan. Red bed residual deluvial soil filler is mostly used in the backfilling of local engineering construction. In order to find out the physical and mechanical properties of red bed residual deluvial soil filler, taking the red bed residual deluvial soil of Zhuzhou as an example, the mechanical properties of red bed residual soil filler are studied through geotechnical tests under different compaction states and different moisture contents. The study results show that the red bed residual deluvial soil filler has good shear resistance and low compressibility under high compaction. The coarse particles in the filler can quickly improve the internal friction angle of the filling soil under low compaction, and can greatly reduce the compaction coefficient when the filling soil reaches a high internal friction angle, which plays a good role in improving the mechanical properties of the filling soil. The study results play a positive role in the safety and economy of local similar engineering construction.