岩三轴蠕变特性的试验研究.pdf

26 7 Vol.26 No.7 2007 7 Chinese Journal of Rock Mechanics and Engineering July 2007 12 1 3 (1. 250061 2. 271018 3. 100083) 2 TU 452 A 1000 6915(2007)07 1381 05 EXPERIMENTAL STUDY ON CREEP PROPERTIES OF SOFT ROCK UNDER TRIAXIAL COMPRESSION 12 1 3 FAN Qingzhong LI Shucai GAO Yanfa (1. Research Center of Geotechnical and Structural Engineering Shandong University Jinan Shandong250061 China 2. College of Hydraulic and Civil Engineering Shandong Agricultural University TaianShandong271018 China 3. School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China) Abstract With the author-developed gravitation loading style rock creep test machineunder the conditions of constant temperature and constant humiditytriaxial compression creep experiments are conducted under different stress states. Oiliness mudstone samples are taken from Longkou Coalfields. The effects of confining pressure and creep parameters of soft rock were focused on and other time-dependent behaviors were analyzed. The experimental results show that the stress threshold for the oil mudstone increases linearly with the confining pressure. The ultimate strength of creep is in direct proportion to confining pressure. The creep process of oil mudstone only goes through two phases that is one is in the damped creep phase when axial stre