结构性吹填土剪切破坏的微结构效应

Micro-structural effect of sheer failure in structured hydraulic fill

室内压缩试验、剪切试验和灵敏度试验分析表明吹填土的微观结构对其力学性质有很大的影响,是一种强结构性土。通过对剪切试验过程土样微观SEM照片进行微结构定量分析,探讨了孔隙和结构单元体微结构参数与轴向应变之间的关系。最后,对结构性吹填土剪切破坏的微结构效应进行了简要分析。结果表明,吹填土的剪切过程经历了孔隙气体压缩-水分运移、团粒散裂-颗粒滑移明显-结构破坏和新结构形成三个阶段。

Through compression test, shear test and sensitivity test, the structure of hydraulic fill is studied, and the result shows that the hydraulic fill microstructure has great influence on its mechanical properties, so of strong structured soil. The soil samples are analyzed quantitatively by micro-structure SEM pictures of and the relation of the void and structure unit body microstructure parameter with axial strain is studied. it is a kind shear test, The microstructural effect of hydraulic fill shearing failure is analyzed in brief. It is found that the shearing failure process of hydraulic fill can be divided into three stages ： （a） compression of gas in void and migration of the moisture content; （b） spallation of the pellet, grain slippage and structure damage; and （c） formation of new structure.