摘要
利用MTS岩石力学试验机,得到了干燥和受压力水作用的碳质页岩的三轴流变试验曲线,对比分析了干燥页岩和受压力水作用页岩的流变特征的异同;在此基础上,由受压力水作用页岩的流变特征,构建了六元件线性黏弹塑性流变模型,得到压力水作用下页岩的本构方程和蠕变方程,并利用流变试验结果求解了模型的流变参数。试验结果表明压力水降低了页岩的屈服强度,加剧了页岩的流变特征。流变模型与试验结果对比显示,所建线性模型能够较好的描述受压力水作用页岩的减速蠕变和等速蠕变阶段,可用来研究承压水作用下防水煤岩柱的流变性质和长期稳定性。
Firstly,by use of the mechanical testing simulation system,the trialxial rheology curves of dry carbonaceous shale and carbonaceous shale in pressure water are obtained and the difference of rheology properties is compared and analyzed.Secondly,a linear viscoelastoplastic model is put forward to describe the rheology properties of shale in pressure water,thus the constitutive equation and creep equation are solved.Finally,the parameters of rheology model are achieved.The test results show that the pressure water reduces the yielding strength and raises the rheology characteristics of carbonaceous shale.The comparison between the rheology model and the experiment results shows that the linear viscoelasticoplastic model can reflect the deceleration and constant creep period,and can be used to study the rheology properties of shale or other rock in confined water.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第7期1131-1134,共4页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(50574064)
关键词
碳质页岩
流变模型
三轴试验
线性黏弹塑性体
压力水
carbonaceous shale
rheology model
triaxial experiment
linear viscoelastoplastic body
pressure water
