Experimental research on creep behaviors of sandstone under uniaxial compressive and tensile stresses  

作　　者：Baoyun Zhao Dongyan Liu Qian Dong 

机构地区：[1]School of Civil Engineering and Architecture,Chongqing University of Science and Technology,Chongqing,401331,China [2]Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University,Chongqing,400045,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2011年第S1期438-444,共7页岩石力学与岩土工程学报(英文版)

基　　金：Supported by the West Region Communication Construction Technology Project of the Ministry of Communications (2009318000001);the National Natural Science Foundation of China (50808187)

摘　　要：The consideration of time dependence is essential for the study of deformation and fracturing processes of rock materials, especially for those subjected to strong compressive and tensile stresses. In this paper, the self-developed direct tension device and creep testing machine RLW-2000M are used to conduct the creep tests on red sandstone under uniaxial compressive and tensile stresses. The short-term and long-term creep behaviors of rocks under compressive and tensile stresses are investigated, as well as the long-term strength of rocks. It is shown that, under low-stress levels, the creep curve of sandstone consists of decay and steady creep stages; while under high-stress levels, it presents the accelerated creep stage and creep fracture presents characteristics of brittle materials. The relationship between tensile stress and time under uniaxial tension is also put forward. Finally, a nonlinear viscoelastoplastic creep model is used to describe the creep behaviors of rocks under uniaxial compressive and tensile stresses.The consideration of time dependence is essential for the study of deformation and fracturing processes of rock materials, especially for those subjected to strong compressive and tensile stresses. In this paper, the self-developed direct tension device and creep testing machine RLW-2000M are used to conduct the creep tests on red sandstone under uniaxial compressive and tensile stresses. The short-term and long-term creep behaviors of rocks under compressive and tensile stresses are investigated, as well as the long-term strength of rocks. It is shown that, under low-stress levels, the creep curve of sandstone consists of decay and steady creep stages; while under high-stress levels, it presents the accelerated creep stage and creep fracture presents characteristics of brittle materials. The relationship between tensile stress and time under uniaxial tension is also put forward. Finally, a nonlinear viscoelastoplastic creep model is used to describe the creep behaviors of rocks under uniaxial compressive and tensile stresses.

关 键 词：laboratory test creep behaviors uniaxial compressive and tensile stresses creep model 

分 类 号：TU458.3[建筑科学—岩土工程]