砂泥岩混合料的流变特性试验研究

Rheological Behavior of Sandstone-Mudstone Mixture

针对砂泥岩混合料高填方工程的长期工后沉降问题,利用自行研制的土体饱水-疏干循环压缩试验系统,对4种混合比的砂泥岩颗粒混合料进行了考虑湿化作用的压缩流变试验,研究了轴向压力以及砂泥岩混合比对流变的影响,对试验后的试样测算了相应的颗粒破碎率,分析了颗粒破碎率与轴向压力及最终流变变形的关系。试验结果表明:最终流变量及颗粒破碎率与轴向压力之间均具有较好的线性关系,流变与时间的关系可近似地用幂函数表达,岩性组成对砂泥岩混合料的流变具有较大影响。

A self-developed drying-wetting cycle compression test system was used to investigate the long term settlement after construction of high embankment of sandstone-mudstone mixture.Compression rheological tests of sandstone-mudstone particle mixture samples with four mixture ratio were carried out,which considered the wetting effect.The influence of axial pressure and sandstone-mudstone mixture ratio on the rheological test was discussed.The corresponding particle breaking rate of the samples after tests was calculated,and the relationships among the particle breakage rate,the axial pressure and final rheological deformation were analyzed.From the test results,it can be seen that the final rheological strain,the particle breakage rate and the axial pressure have a good linear relationship,and the relationship between the rheological strain and time can be approximately expressed by power function.Lithology composition of the sandstone-mudstone mixture has a great influence on rheological deformation.