Study on failure mechanics behavior and damage evolution law of yellow sandstone under uniaxial triaxial and pore water action
LIU Gang1，2，LI Yingming1，XIAO Fukun2，HUANG Shunjie1，ZHANG Ruofei1
(1. Key Laboratory of Safety and High-efficiency Coal Mining，Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Heilongjiang Ground Pressure and Gas Control in Deep Mining Key Laboratory，Heilongjiang University of Science and Technology，Harbin，Heilongjiang 150022，China)
Abstract：In order to explore the mechanical behavior and energy evolution law of rock damage and failure under the coupling effect of stress and water，the experiments of single and triaxial pore water pressure on yellow sandstone were carried out，and acoustic emission(AE) monitoring was carried out simultaneously. The strength and deformation characteristics of rock under the influence of effective stress are analyzed，and the energy transformation law in the whole process is obtained. Based on AE energy，the damage evolution equation is deduced，and the damage evolution stages and characteristics of yellow sandstone under different conditions are analyzed. The experimental results show that，there is a positive correlation between effective peak load and effective residual stress and effective confining pressure. The elastic modulus increases linearly with the increase of effective confining pressure. And Poisson's ratio is inversely proportional to water pressure. As the water pressure increases，the compaction phase becomes shorter and shorter，the elastic and plastic phases continue to increase，and the expansion point is also increasing. Besides with the increase of effective confining pressure，the main control cracks become more and more regular，the linear characteristics become more and more obvious，the micro-cracks become less and less，and the rupture angle is gradually increased. Under the hydraulic coupling condition，the main rock rupture is more obvious，and the micro rupture gradually decreases with the increase of water pressure and confining pressure. What is more，by analyzing the relationship between effective normal stress and effective shear stress，the τ-σ damage strength curve satisfies the Coulomb criterion. With the increase of effective confining pressure，the total energy，elastic energy，dissipated energy，energy released after the peak and surplus energy all show an increasing trend. And as the pore water pressure increases，the surplus energy becomes smaller and smaller，indicating that high water pressure can reduce the occurrence of dynamic damage. Based on the energy damage evolution equation，five typical stages of damage evolution are given，and the relationship between water pressure and rock brittleness damage is obtained. The research results have theoretical implications for surrounding rock control and prevention disasters with water injection in different stress states.
刘 刚1，2，李英明1，肖福坤2，黄顺杰1，张若飞1. 单、三轴及孔隙水作用下黄砂岩破坏力学行为及损伤演化规律研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3532-3544.
LIU Gang1，2，LI Yingming1，XIAO Fukun2，HUANG Shunjie1，ZHANG Ruofei1. Study on failure mechanics behavior and damage evolution law of yellow sandstone under uniaxial triaxial and pore water action. , 2019, 38(S2): 3532-3544.
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2019, Vol. 38 
