岩土力学Issue(10)：2815-2822,8.
水力耦合作用下的砂岩声发射特性试验研究
Experimental study of acoustic emission characteristics of sandstone under hydro-mechanical coupling action
摘要
Abstract
Water pressure could stimulate rock crack and accelerate the process of rock failure, this has an important influence on the deformation characteristics and failure mechanism of rock. A hydro-mechanical coupling test of sandy rock is conducted at different confining pressures by MTS815 Flex Test GT rock mechanics test system and PCI-Ⅱ acoustic emission (AE) system. The experimental results are displayed as follows: AE activity represents different characteristics with the loading time and stress changing during the total loading process. With the increase of water pressure, the AE activity is more concentrated and strength is higher after the stress reaches the peak strength of rock. But concentration and strength reduce with the increase of confining pressure. At the same confining pressure, the AE counts and energy increase as the water pressure increases. As the water pressure increases, the number of cracks enhances and the degree of concentration of crack is higher in the 3-D location of AE figures when the rock is unstable failure. At the same time, the failure angle decreases on the macroscopic failure morphology. These results reveal that the mechanism of rock failure changes from suppression of shear to suppression of tension rift;its plasticity is weakened and brittleness is enhanced under hydro-mechanical coupling process.关键词
岩石力学/水力耦合试验/岩石破坏/声发射/声发射计数/声发射能量Key words
rock mechanics/hydro-mechanical coupling test/rock failure/acoustic emission (AE)/acoustic emission counts/acoustic emission energy分类
建筑与水利引用本文复制引用
陈子全,李天斌,陈国庆,张航..水力耦合作用下的砂岩声发射特性试验研究[J].岩土力学,2014,(10):2815-2822,8.基金项目
国家自然科学基金资助项目(No.41230635，No.41002110，No.41272330)；交通运输部西部交通建设科技项目(No.20113188051090)。 （No.41230635，No.41002110，No.41272330）
