基于线性储能规律的红砂岩蠕变能量演化分析方法  

Analysis of creep energy evolution of red sandstone based on linear energy storage law

作　　者：刘之喜 赵光明[1,2] 孟祥瑞[1,2] 张若飞[1,2] 程详[1,3,4] 董春亮 黄顺杰 LIU Zhixi;ZHAO Guangming;MENG Xiangrui;ZHANG Ruofei;CHENG Xiang;DONG Chunliang;HUANG Shunjie(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;Geological Resources and Geological Engineering Post-Doctoral Flow Station,Anhui University of Science and Technology,Huainan,232001,China;Post-Doctoral Research Station,Huaibei Mining Corporation Limited,Huaibei 235006,China;School of Mechanics and Optoelectronics Physics,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]安徽理工大学地质资源与地质工程博士后流动站,安徽淮南232001 [4]淮北矿业股份有限公司博士后科研工作站,安徽淮北235000 [5]安徽理工大学力学与光电物理学院,安徽淮南232001

出　　处：《中南大学学报（自然科学版）》2021年第8期2748-2760,共13页Journal of Central South University:Science and Technology

基　　金：安徽省重点研究与开发计划项目(201904a07020010);安徽省“省特支计划”的领军人才项目(2019);国家自然科学基金资助项目(51974009,51774012,51674008,52004005,52074006);国家重点研发计划项目(2017YFC0603003);安徽省学术和技术带头人科研活动经费资助项目(2018D187);高校优秀拔尖人才培育资助项目(gxbjZD2016051);安徽省自然科学基金资助项目(2008085QE222);安徽高校科研平台创新团队建设项目(2015)。

摘　　要：为了研究红砂岩蠕变过程中的能量演化规律,进行红砂岩单轴循环加卸载试验、单轴分级蠕变试验以及蠕变后的单轴循环加卸载试验,提出一种岩石蠕变能量演化分析的新方法。研究结果表明:单轴循环加卸载试验将红砂岩内部孔隙、微裂纹等缺陷逐渐被压密后,红砂岩变为非线性伪弹性体,加载曲线与卸载曲线形成一个密闭的滞回环;红砂岩变为非线性伪弹性体后继续承受加卸载会再次产生残余变形,因此,红砂岩在单轴循环加卸载作用下的残余变形规律为较大残余变形—无残余变形—再次产生残余变形;红砂岩单轴循环加卸载产生的耗散能密度达到初次稳定时的循环次数与出现非线性伪弹性体的循环次数基本保持一致,在应力上限恒定的单轴循环荷载作用下,红砂岩的弹性能密度基本保持不变;假设蠕变过程中长期荷载对红砂岩弹性能密度无影响,根据假设进行蠕变后的单轴循环加卸载试验,验证了假设的正确性;首次加卸载存在线性储能规律,基于红砂岩线性储能规律和蠕变后红砂岩弹性能密度基本不变特性可以得到蠕变的弹性能密度与耗散能密度。In order to study the law of energy evolution in the process of red sandstone creep,uniaxial cyclic loading and unloading test,uniaxial graded creep test and uniaxial cyclic loading and unloading test after creep were carried out.A new method for creep energy evolution analysis of rock was proposed.The results show that after uniaxial cyclic loading and unloading test,the internal pores and microcracks of red sandstone are gradually compacted,the red sandstone becomes a nonlinear pseudo-elastic body,and the loading curve and unloading curve form a closed hysteresis loop.The red sandstone becomes a nonlinear pseudo-elastic body and its continues bearing of loading and unloading will produce residual deformation again,so the residual deformation law of red sandstone under uniaxial cyclic loading and unloading is as follows.There is large residual deformation-no residual deformation-residual deformation again.The number of cycles produced by uniaxial cyclic loading and unloading of red sandstone is basically consistent with the number of cycles of nonlinear pseudo-elastic bodies,and the elastic energy density of red sandstone remains basically unchanged under uniaxial cyclic loading with constant stress upper limit.Assuming that the long-term load of creep process has no effect on the elastic energy density of red sandstone,the hypothesis is verified by uniaxial cyclic loading and unloading test after creep.Through uniaxial cyclic loading and unloading test of red sandstone,it is found that linear energy storage law exists for the first loading and unloading.Based on the linear energy storage law of red sandstone and the invariable elastic energy density of red sandstone after creep,the elastic energy density and dissipated energy density of creep can be obtained.

关 键 词：蠕变试验 能量演化 弹性能密度 线性储能规律 

分 类 号：TU45[建筑科学—岩土工程]