The loess-rocky landslide and rock landslide have a wide distribution in Gansu Tianshui region,having a large quantity,and the major sliding surfaces are happened in mudstone.In order to further understand the creep charac-teristics of soft rock and the nature of landslide deformation and failure,YSJ—01—00 rock triaxial creep test machine was used to carry out the triaxial compression creep test on the mudstone in the natural state and obtained in Tianshui, Gansu.The complete creep curve,different stress level strain-time curves,and long-term strength of mudstone were ob-tained.The creep behaviors of the mudstone samples were analyzed,a modified Nishihara model and the failure criteria of the model were obtained.The parameters of the modified Nishihara model and the creep damage time were derived by fitting the modified Nishihara model to compression creep curve of the mudstone samples.The results show that the mod-ified Nishihara model can effectively describe mudstone creep,especially in the accelerating creep stage,which is con-ducive to the research of landslide prediction,and has great scientific significance and engineering significance to the study of loess-rock landslide,rock landslide and other soft rock in Gansu area.%甘肃天水地区黄土-岩质滑坡和岩质滑坡分布面积较广,数量较多,且滑面多处于泥岩中.为了进一步探究软岩的蠕变特性,了解滑坡变形破坏的本质,采用YSJ—01—00岩石三轴压缩蠕变试验仪对天然状态下的甘肃天水泥岩进行了分级加载条件下的三轴压缩蠕变试验,得到了泥岩的蠕变全过程曲线、不同应力水平下的应变-时间曲线和长期强度.通过对其蠕变特性进行分析,提出了一种改进的西原模型和模型的破坏判据,并利用改进的西原模型对泥岩压缩蠕变曲线进行拟合,获得了泥岩的蠕变参数,推导出蠕变破坏的时间.分析结果表明,改进的西原模型能够较好地描述泥岩的蠕变规律,特别是加速蠕变阶段,这有利于滑坡临滑预报的研究,对甘肃地区黄土-岩质滑坡、岩质滑坡和其他软岩研究等具有重要的科研意义和工程意义.
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