(1. College of Pipeline and Civil Engineering，China University of Petroleum，Qingdao，Shandong 266580，China；2. Hunan Provincial Key Laboratory of Hydropower Development Key Technology，PowerChina Zhongnan Engineering Corporation Limited，Changsha，Hunan 410014，China；3. Research Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Some fractured structures which compose of soft sandstone have been developed in a hydropower project. It has poor integrity and pore cementation contact，and the creep properties producing a significant impact on the deformation and stability of the dam under long term load. Based on the characteristics of loose organizational structure，high moisture content，poor physico-mechanical properties，the triaxial creep tests were carried out first. The results show that the soft rock has a significant creep property，and the creep curve is mainly divided into transient and steady creep. Increasing stress can aggravate the creep deformation，and the finally failure of the specimen shows the characteristics of large axial compression deformation，obvious volumetric ductility dilation and large steady creep rate. Secondly，the creep curves are described by taking three dimensional Burgers creep model. The parameters are identified with combination of Quasi-Newton optimized algorithms method. The selected model can describe the creep properties of soft rock correctly. The research results have important reference value for similar projects.
张 玉1，2，徐卫亚3，王 伟3，邵建富3，顾锦健3. 破碎带软岩流变力学试验与参数辨识研究[J]. 岩石力学与工程学报, 2014, 33(S2): 3412-3420.
ZHANG Yu1，2，XU Weiya3，WANG Wei3，SHAO Jianfu3，GU Jinjian3. STUDY OF rheologICAL TESTS AND ITS PARAMETERS IDENTIFICATION OF SOFT ROCK IN FRACTURED BELT. , 2014, 33(S2): 3412-3420.
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2014, Vol. 33 
