Effect of dry-wet cycles on dynamic properties and microstructures of sandstone:Experiments and modelling  

作　　者：Hai Pu Qingyu Yi Andrey P.Jivkov Zhengfu Bian Weiqiang Chen Jiangyu Wu 

机构地区：[1]State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Earth Engineering,China University of Mining and Technology,Xuzhou 221116,China [2]Key Laboratory of Xinjiang Coal Resources Green Mining,Ministry of Education,Xinjiang Institute of Engineering,Urumqi 830023,China [3]Department of Solids and Structures,School of Engineering,University of Manchester,Manchester M139PL,UK [4]School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China [5]Department of Civil and Environmental Engineering,Rice University,Houston 77005,USA [6]State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China [7]Department of Materials,University of Oxford,Oxford OX13PH,UK

出　　处：《International Journal of Mining Science and Technology》2024年第5期655-679,共25页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52374147,42372328,and U23B2091);National Key Research and Development Program of China(No.2023YFC3804200);Xinjiang Uygur Autonomous Region Science and Technology Major Program(No.2023A01002).

摘　　要：Underground pumped storage power plant(UPSP)is an innovative concept for space recycling of abandoned mines.Its realization requires better understanding of the dynamic performance and durability of reservoir rock.This paper conducted ultrasonic detection,split Hopkinson pressure bar(SHPB)impact,mercury intrusion porosimetry(MIP),and backscatter electron observation(BSE)tests to investigate the dynamical behaviour and microstructure of sandstone with cyclical dry-wet damage.A coupling FEM-DEM model was constructed for reappearing mesoscopic structure damage.The results show that dry-wet cycles decrease the dynamic compressive strength(DCS)with a maximum reduction of 39.40%,the elastic limit strength is reduced from 41.75 to 25.62 MPa.The sieved fragments obtain the highest crack growth rate during the 23rd dry-wet cycle with a predictable life of 25 cycles for each rock particle.The pore fractal features of the macropores and micro-meso pores show great differences between the early and late cycles,which verifies the computational statistics analysis of particle deterioration.The numerical results show that the failure patterns are governed by the strain in pre-peak stage and the shear cracks are dominant.The dry-wet cycles reduce the energy transfer efficiency and lead to the discretization of force chain and crack fields.

关 键 词：Underground pumped storage power plant Dry-wet cycles Split Hopkinson pressure bar Macro and micro properties FEM-DEM coupling model Damage characterization 

分 类 号：TV223.1[水利工程—水工结构工程]