【摘要】 为研究冻融循环作用下砂岩强度特性变化规律,开展了天然砂岩在不同冻融循环次数作用下的室内试验,分析砂岩的破坏特性、抗剪强度参数及弹性模量变化规律,结果表明:砂岩经过冻融循环作用后,其破坏面形式与天然状态下的砂岩破坏面形式保持相同;其内摩擦角随着冻融循环次数的增加呈现先增大后保持不变的变化规律;而黏聚力呈现先减小后保持不变的变化规律;对于砂岩试样的弹性模量,随着冻融循环次数的增加呈现减小的趋势;且当循环次数较少时,其弹性模量减小幅度较大;当冻融循环次数达到一定后,其弹性模量减小幅度较小。更多还原

【Abstract】 To investigate the variation pattern of sandstone strength characteristics under the influence of freeze-thaw cycles, indoor experiments of natural sandstone were carried out under different freeze-thaw cycle indexes. The failure characteristics, shear strength parameters and elastic modulus varying pattern of sandstone were analyzed, and the results were shown below. After the freeze-thaw cycle, the failure surface of sandstones remained the same with natural sandstone failure surface. The internal friction angle increased at first and then remained constant as the number of freeze-thaw cycles increased, while the cohesion had a decreasing tendency and then remains unchanged. For the elastic modulus of the sandstone samples, it decreased with the increase of the number of freeze-thaw cycle. However, when the number of cycles was low, the elastic modulus decreased greatly. As the cycle number reached a certain level, the elastic modulus decreased less.更多还原