干燥与饱水状态下石英杂砂岩蠕变力学特性

Mechanical Property and Creep Behavior of Quartz Sandstone under Dry and Saturated States

以某水利枢纽工程右岸岩质边坡石英杂砂岩为例,采用显微镜及X射线衍射仪分析岩石矿物成分,通过干燥和饱和状态下石英杂砂岩的室内分级加载单轴蠕变力学试验,获得不同轴应力和不同含水状况下的岩石瞬时应变、蠕应变及总应变,揭示了不同含水状况下石英杂砂岩的蠕变力学特性。结果表明,在不同轴向压力作用下,随着轴向应力的增加,石英杂砂岩的轴向和径向应变均增大,且径向应变占总应变比例大于轴向应变;在不同含水状况下,饱和状态的石英杂砂岩应变明显大于干燥状态下应变。

Exemplified by Quartz Sandstone of Xiajiang right bank rock slope,investigation was made on the mineral composition by X ray powder diffraction and microscope.The instantaneous strain axial creep strain,creep strain and total strain of quartz sandstone under differently uniaxial stress and contained water are achieved through dry and saturated states by uniaxial creep experiments,and the creep fracture property of quartz sandstone is revealed.The results indicate that under differently uniaxial stress,the axial strain and radial strain increase with axial stress increased,and the proportion of the radial strain is higher than axial strain.Under different contained water conditions,the quartz sandstone strain under saturated state is significantly greater than that in dry state.