岩石扰动流变规律和本构关系的试验研究  

EXPERIMENTAL STUDY ON RHEOLOGICAL REGULARITY AND CONSTITUTIVE RELATIONSHIP OF ROCK UNDER DISTURBING LOADS

作　　者：崔希海[1] 李进兰[1] 牛学良[2] 王素华[2] 

机构地区：[1]山东科技大学泰安校区,山东泰安271021 [2]山东科技大学资源与环境工程学院,山东青岛266510

出　　处：《岩石力学与工程学报》2007年第9期1875-1881,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50474029)

摘　　要：根据生产实际情况提出"扰动载荷"和"扰动流变"的概念,简单介绍自主研发的"常载三轴扰动流变仪",并用该仪器和"MTS试验系统"对2种较典型的岩石(红砂岩和软弱泥岩)进行岩石压缩流变、岩石压缩扰动流变和岩石拉伸扰动流变试验。在对试验结果进行分析整理的基础上,得出如下结论:岩石扰动流变的应变远大于同应力下的瞬时应变和流变应变;每一扰动均产生相应的应变突变?ε,且其大小正比于扰动应力幅值?σ和静应力σ,并与变形史有关;每一种岩石都存在一个扰动流变的应力敏感范围。通过对试验结果的数值分析,建立起以应力状态和扰动载荷及时间为自变量的扰动流变本构方程,并用试验数据对其进行验证。开展岩石扰动流变试验与扰动流变理论的研究,可以拓展岩石流变理论和软岩支护设计理论的研究内容。The concepts of disturbing load and disturbing rheology of rocks are put forward on the basis of real production processes and self-developed disturbing rheological instruments with ordinary triaxial box and disturbing load device are simply introduced. Using MTS and the self-developed disturbing rheological instrument with ordinary triaxial box and disturbing load devices, tests of rock rheology under compression and compression rheology under disturbing loads as well as tensile rheolegy under tensile stresses of two typical rocks（red sandstone and soft mudstone） are carded out. Through analyzing the data of rheological tests, some important conclusions are drawn as follows： （1） disturbing rheological strain of rock is much greater than the instantaneous strain and rheological strain of rock under the same stress; （2） each disturbing load can always cause a mutation of strain and the mutation of strain is in direct ratio to static stress σras well as disturbing stress △σ; and （3） for each rock, there is a sensitive range of the static stress σ and disturbing stress Act, etc.. Through analyzing the data of tests, a rheological constitutive equation as a function of disturbing load and stress as well as time is established; and the constitutive equations are proven with test data. Moreover, the sensitive range of static stress and disturbing stress to produce disturbing rheology is also studied. The studies of rock disturbing rheological test and disturbing rheological theory may extend the content of the theory for rock rheology and support design of softrocks.

关 键 词：岩石力学 扰动载荷 扰动流变 扰动流变仪 软岩支护 

分 类 号：TU45[建筑科学—岩土工程]