水文地质工程地质2012，Vol.39Issue(4)：43-48,6.
深部围岩流变特性试验研究及其模型辨识
An experimental study of the creep properties of deep surrounding rocks and creep model identification
摘要
Abstract
By means of stepwise incremental cycling loading and unloading, the experiment is conducted on uniaxial creep properties of siltstone at the floor of coal seam II in the eastern roadway beneath 300 m of the Shuijingtou coalmine of the Niumasi Mining Company of Hunan Xiangmei Group. The axial creep deformation properties are discribed in details in this paper. The relationship among creep rate, time and stress level is discussed. The properties of the instantaneous elastic modulus and the deformation modulus are explored. The test results show that the attenuation creep occurs and the creep rate is inconspicuously influenced by stress level when the stress level is lower than the long-term strength of siltstone. Constant rate creep occurs when the stress level is higher than the long-term strength of siltstone. Through scientific analysis of the experimental data, the creep model is identified and parameters of the model are determined based on the principle of least square. According to creep characteristics of rock under stepwise loading and unloading at different stress levels, a modified Nishihara model is established for simulating the creep characteristics. Calculation results show that the modified Nishihara model not only better describes attenuation creep under lower stress level, but also accurately describes attenuation creep and constant rate creep under higher stress levels.关键词
围岩蠕变/分级加卸载/模型辨识/改进的西原模型Key words
surrounding rock creep/ stepwise loading and unloading/ model identification/ modified Nishihara model分类
建筑与水利引用本文复制引用
刘正,高文华,刘栋,邓修甫..深部围岩流变特性试验研究及其模型辨识[J].水文地质工程地质,2012,39(4):43-48,6.基金项目
国家自然科学基金(50874043) （50874043）
湖南省教育厅重点科研项目(09A028) （09A028）
湖南省科技计划项目(2010FJ3046) （2010FJ3046）
