Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel

doi:10.1016/j.jrmge.2018.06.006

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Mechanical properties and associated seismic isolation effects of foamed concrete layer in rock tunnel
	Ma, Shaosen ; Chen, Weizhong ; Zhao, Wusheng
刊名	JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
	2019
卷号	11 期号:1 页码:159-171
关键词	Rock tunnel Foamed concrete Seismic isolation layer Seismic isolation mechanism
ISSN号	1674-7755
DOI	10.1016/j.jrmge.2018.06.006
英文摘要	Foamed 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/).
WOS研究方向	Engineering
语种	英语
WOS记录号	WOS:000456213000013
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15062]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.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
推荐引用方式 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.