(1. College of Water Resources and Civil Engineering，China Agricultural University，Beijing 100083，China；
2. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China)
Abstract：It is very important to reasonably describe the creep law of soft rock for buildings＇long-term stability in Tianshui area，Gansu Province. In order to study the creep behavior of Tianshui mudstone，triaxial creep tester was used with different loadings and water contents. The strain-time relationship was obtained. The creep process and creep characteristics were analyzed. And suitable creep model was established. The results showed that with the increase of stress level and time，the creep value increased slowly，but eventually kept a certain stable value. The creep of mudstone also increased with stress dispersion，confining pressure and moisture content. Under different confining pressure and water content, the creep increased with time，and the isochronous curve gradually shifted to the strain axis. It is inferred from the inflection point of isochronous curve of the specimens that under certain stress level the creep reached long-term strength. Based on creep parameters identification，the Xiyuan model，logical regression model and exponential empirical model were in good agreement with the experimental data. The three creep models could well reflect the whole creep process from elastic deformation to attenuation creep and even to stable creep at low stress level. The logical regression model and exponential model can better reflect the creep characteristic curves and parameters of mudstone. The established nonlinear creep model could be used to describe the creep mechanical properties of mudstone in Tianshui，therefore it has certain significance for engineering application.
张泽林1，吴树仁2，王 涛2，辛 鹏2，梁昌玉2. 甘肃天水泥岩剪切蠕变行为及其模型研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3603-3617.
ZHANG Zelin1，WU Shuren2，WANG Tao2，XIN Peng2，LIANG Changyu2. Study on shear creep behavior and its model of mudstone in Tianshui，Gansu Province. , 2019, 38(S2): 3603-3617.
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2019, Vol. 38 
