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Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel
Ma, Shaosen; Chen, Weizhong; Zhao, Wusheng
2019
Source PublicationJOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
ISSN1674-7755
Volume11Issue:1Pages:159-171
AbstractFoamed concrete has a good energy absorption capability and can be used as seismic isolation material for tunnels. This study aims to investigate the mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel. For this, a series of uniaxial/triaxial compression tests was conducted to understand the effects of concrete density, confining stress and strain rate on the mechanical properties of foamed concrete. The direct shear tests were also performed to investigate the effects of concrete density and normal stress on the nonlinear behaviors of foamed concrete layer-lining interface. The test results showed that the mechanical properties of foamed concrete are significantly influenced by the concrete density. The foamed concrete also has high volumetric compressibility and strain-rate dependence. The peak stress, residual stress, shear stiffness and residual friction coefficient of the foamed concrete layer-lining interface are influenced by the foamed concrete density and normal stress applied. Then, a crushable foam constitutive model was constructed using ABAQUS software and a composite exponential model was also established to study the relationship between shear stress and shear displacement of the interface, in which their parameters were fitted based on the experimental results. Finally, a parametric analysis using the finite element method (FEM) was conducted to understand the influence of foamed concrete layer properties on the seismic isolation effect, including the density and thickness of the layer as well as the shear stiffness and residual friction coefficient of the interface. It was revealed that lower density and greater thickness in addition to smaller shear stiffness or residual friction coefficient of the foamed concrete layer could yield better seismic isolation effect, and the influences of the first two tend to be more significant. (C) 2018 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
KeywordRock tunnel Foamed concrete Seismic isolation layer Seismic isolation mechanism
DOI10.1016/j.jrmge.2018.06.006
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Geological
WOS IDWOS:000456213000013
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://119.78.100.198/handle/2S6PX9GI/15062
Collection岩土力学所知识全产出_期刊论文
国家重点实验室知识产出_期刊论文
Affiliation1.Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250061, Shandong, Peoples R China;
2.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Ma, Shaosen,Chen, Weizhong,Zhao, Wusheng. Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2019,11(1):159-171.
APA Ma, Shaosen,Chen, Weizhong,&Zhao, Wusheng.(2019).Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,11(1),159-171.
MLA Ma, Shaosen,et al."Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 11.1(2019):159-171.
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