岩土工程学报2015，Vol.37Issue(9)：1613-1619,7.DOI:10.11779/CJGE201509007
渗流水压力分级加载岩石蠕变特性研究
Experimental study on creep of rocks under step loading of seepage pressure
摘要
Abstract
The creep and damage of fine sandstone rock under gradual loading of seepage stress are investigated through a series of triaxial compression tests using RLW-2000M coal and rock computer-controlled rheological testing machine. The volumetric strain and seepage volume (volume rate) evolution curves of rock creep under different seepage stresses are highlighted. In addition, the transformation curves of rock creep and permeability coefficient under different seepage stresses are analyzed and compared. The results show that the porosity evolution has agreement with three stages in typical creep process. As the gradual loading of seepage water pressure, the instantaneous axial and transverse strains as well as Poisson's ratio have an increasing trend. With the accumulated strain, the transverse strain is greater than the axial one in company with expansion effect until the occurrence of creep damage. The seepage volume curve is linearly evolved under the gradual loading of seepage water pressure. It is conclued that the permeability coefficient decreases firstly and then increases. The initial permeability has a memory (a memory of rock pore channels) that pore channels are formed through the process of deformation-closing-erosion-new channel.关键词
岩石力学/砂岩/蠕变/分级加载/渗流压力Key words
rock mechanics/sandstone/creep/step loading/seepage pressure分类
矿业与冶金引用本文复制引用
杨红伟,许江,聂闻,彭守建..渗流水压力分级加载岩石蠕变特性研究[J].岩土工程学报,2015,37(9):1613-1619,7.基金项目
国家自然科学基金面上项目(51474040) （51474040）
国家青年科学基金项目(51304255) （51304255）
宜宾市科学技术局重点科研项目(2014SF032) （2014SF032）
宜宾学院博士科研启动金项目(2012B18) （2012B18）
