Dynamic compression characteristics of layered rock mass of significant strength changes in adjacent layers

查看全文 作　　者：Sen [1]Wen;Chunshun [2]Zhang;Yulin [1]Chang;Ping [3]Hu

机构地区：[1]Institute of Geotechnical and Rail Transport Engineering,Henan University,Kaifeng,475004,China;[2]Department of Civil Engineering,Monash University,Clayton,VIC,3800,Australia;[3]School of Civil Engineering,University of South China,Hengyang,421001,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》索引2020年第12卷第2期,共13页

基　　金：supported by the National Natural Science Foundation of China(Grant No.51608174);the Programmes for Science and Technology Development of Henan Province,China(Grant No.192102310014)。 摘　　要：Layered rock mass of significant strength changes for adjacent layers is frequently observed in underground excavation,and dynamic loading is a prevalent scenario generated during excavation.In order to improve the driving efficiency and reduce engineering accidents,dynamic compression characteristics of this kind of rock mass should be understood.The dynamic properties of a layered composite rock mass are investigated through a series of rock tests and numerical simulations.The rock mass is artificially made of various proportions of sand,cement and water to control the distinct strength variations at various composite layers separated by parallel bedding planes.All rock specimens are prefabricated in a specially designed mould and then cut into 50 mm in diameter and 50 mm in height for split Hopkinson pressure bar(SHPB)dynamic compression testing.The test results reveal that increasing strain rate causes the increases of peak strength,σ_p,and the corresponding failure strain,ε_p,while the dynamic elastic modulus,E_d,remains almost unchanged.Interestingly,under the same strain rates,Ed of the composite rock specimen is found to decline first and then increase as the dip angle of bedding plane increases.The obtained rock failure patterns due to various dip angles lead to failure modes that could be classified into four categories from our dynamic tests.Also,a series of counterpart numerical simulations has been undertaken,showing that dynamic responses are in good agreement with those obtained from the SHPB tests.The numerical analysis enables us to Iook into the dynamic characteristics of the composite rock mass subjected to a broader range of strain rates and dip angles than these being tested. 关键词：ROCK dynamics Split hopkinson pressure bar(SHPB) Layered composite ROCK SPECIMEN Dip angle of BEDDING plane Strain rate Numerical simulation

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Dynamic compression characteristics of layered rock mass of significant strength changes in adjacent layers

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