层状盐岩能源储库泥岩夹层蠕变特性研究  

Study on Creep Properties of Mudstone Interlayer in Bedded Salt Rock Energy Storage

作　　者：陈鹤 陈结[1,2] 吴斐[1,2] 丁博文 卢丹[1,2] Chen He;Chen Jie;Wu Fei;Ding Bowen;Lu Dan(State Key Laboratory of Coal Mine Disaster Dynamics and Controls,Chongqing University,Chongqing 400044,P.R.China;School of Resources and Safety Engineering,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学资源与安全学院,重庆400044

出　　处：《地下空间与工程学报》2023年第4期1196-1205,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52022014,51834003)。

摘　　要：针对目前层状盐岩能源储库围岩中泥岩夹层的蠕变特性问题,结合声发射技术对泥岩夹层的多级阶梯蠕变力学行为进行了研究,并分析了各应力水平下从初始加载到稳定蠕变的损伤特征。结果表明:在低应力水平下,夹层的轴向变形大于横向变形,随着应力的增加,尤其在临近破坏阶段,横向变形现象更加显著,而对应的轴向与横向稳态蠕变率随加载应力的增加均呈现非线性加速;在各应力水平的初始加载阶段,泥岩夹层产生大量AE信号,待蠕变稳定后AE声发射计数信号明显减小,在最后一级应力水平下产生大量的AE信号;利用改进后的分数阶黏弹塑性模型与西原体模型对理论与试验蠕变曲线结果进行拟合对比,拟合结果表明改进后的蠕变方程曲线与试验曲线的演化规律更吻合。With regard to the current creep characteristics of mudstone intercalation in the surrounding rock of layered salt rock energy storage,combined with acoustic emission technology,the multi-step creep mechanical behavior of mudstone interlayer was studied.And the damage characteristics from initial loading to stable creep under different stress levels are analyzed.The results show that at low-stress levels,the axial deformation of the interlayer is greater than the lateral deformation.As the increase of the stress level,the lateral deformation becomes more significant,and the corresponding axial and lateral steady-state creep rates both exhibit nonlinear acceleration with the increase of the loading stress.In the initial loading stage of each stress level,the mudstone interlayer releases a large number of AE signals.After the creep stabilization,the AE signals decreased obviously,and a large number of AE signals were released at the last stress level.The improved fractional viscoelasticplastic model and Nishihara model are used to fit and compare the results of theoretical and experimental creep curves.The fitting results show that the improved creep equation curve is more consistent with the evolution law of the experimental curve.The research results reflected the creep law of mudstone interlayer to a certain extent.

关 键 词：层状盐岩 泥岩夹层 蠕变 分级加载 

分 类 号：TD985[矿业工程—选矿]