岩土力学2025，Vol.46Issue(7)：1997-2010,14.DOI:10.16285/j.rsm.2025.0053
渗流-采动应力耦合作用下深部砂岩力学及能量演化规律研究
Mechanical properties and energy evolution law of deep-buried sandstone under seepage-mining stress coupling
摘要
Abstract
The main cause of underground disasters in coal mines is the stress concentration and high-intensity unloading of surrounding rock caused by man-made mining and the extraction of coal resources.Especially when the surrounding rock is affected by confined water,it is easy to lose stability and damage,which leads to the occurrence of disasters.Accordingly,the experimental study on the mechanical properties and energy evolution law of sandstone under the coupling of seepage and mining stress was carried out by means of Rock Top multi-field coupling tester.The test results show that:(1)The total stress-strain curve of sandstone can be divided into five stages.After the sandstone begins to unload,it changes from axial deformation to circumferential deformation.(2)The peak stress of sandstone increases with the increase of unloading level.With the increase of osmotic pressure difference,the peak stress of sandstone is not obvious due to the superposition of surrounding rock and water pressure.(3)The higher the unloading level of sandstone is,the larger the axial strain value at the peak stress is,and the axial deformation of sandstone is more obvious under high unloading level.The evolution law of dilatancy angle curve of sandstone roughly follows the law of'increase—ecrease—increase—decrease',and the expansion behavior of sandstone is more significant under low unloading level.(4)With the increase of initial unloading level,the elastic strain energy density of sandstone increases as a whole.The energy distribution coefficient of elastic strain energy density increases first and then decreases with the increase of axial strain of rock sample.(5)The instantaneous energy distribution coefficient of elastic strain energy of sandstone presents the change rule of'increase—decrease—increase'with the increase of axial strain of rock sample.The energy storage capacity of sandstone elastic strain energy reaches its peak after entering the elastic deformation stage,and its energy release capacity reaches its peak before entering the residual stress stage.关键词
水力耦合/力学特性/深部围岩/能量演化/储能能力Key words
hydro-mechanical coupling/mechanical properties/deep surrounding rock/energy evolution/energy storage capacity分类
建筑与水利引用本文复制引用
张培森,崔乾,王洪伟,洪荒,许大强,陈增宝,邓云驰,梁展,李金坤,陈文豪..渗流-采动应力耦合作用下深部砂岩力学及能量演化规律研究[J].岩土力学,2025,46(7):1997-2010,14.基金项目
国家重点研发计划资助项目(No.2018YFC0604702) （No.2018YFC0604702）
国家自然科学基金资助项目(No.51379119) （No.51379119）
山东省自然科学基金资助项目(No.ZR2021ME086).This work was supported by the National Key Research and Development Program of China(2018YFC0604702),the National Natural Science Foundation of China(51379119)and the Natural Science Foundation of Shandong Province,China(ZR2021ME086). （No.ZR2021ME086）
