Analysis of mechanical behavior of a pipe-roof based on model of anisotropic plate on elastic foundation

doi:10.1088/1755-1315/570/5/052070

	Analysis of mechanical behavior of a pipe-roof based on model of anisotropic plate on elastic foundation
	Song,WU 2; Cheng-jie,ZHI 2; Hua,TANG 1; Yong-hao,DAI 1
刊名	IOP Conference Series: Earth and Environmental Science
	2020-10-01
卷号	570 期号:5
ISSN号	1755-1307
DOI	10.1088/1755-1315/570/5/052070
英文摘要	Abstract According to the equivalent stiffness method of elastic theory, pipe roofs can be regarded as stiffening ribs and reinforced rock and soil can be regarded as an isotropic plate. Hence, pipe roofs and reinforced rock and soil in the local area of tunnel’s arch crown can be considered as an anisotropic plate on an elastic foundation with specific constraints on the four edges. To improve the traditional elastic foundation beam model for pipe roofs, an anisotropic plate model of a pipe roof on an elastic foundation is established. The hyperbolic model is adopted for the foundation reaction. The mechanical model of a pipe roof is extended from one to two dimensions and solved by finite element method via the COMSOL partial differential equation (PDE) module. The model is used to analyze the mechanical behavior of a pipe-roof for a shallow-buried and soft rock highway tunnel. Meanwhile, the calculated results of the hyperbolic and traditional models (Pasternak model and Winkler model) are compared and analyzed. The results show that the following: (1) The stress and deformation of pipe roofs mainly appear in the section no more than 6 m ahead of the working face. The pipe roof plays a role of a supporting beam to improve the stabilization of the working face. It can effectively transfer the upper load to the un-excavated section and better distribute the stress of surrounding rock. (2) The 2D pipe-roof model overcomes defects of traditional models that cannot simulate the plane stress of the reinforced area and provides a reference for the design and construction of pipe-roofs. The longitudinal bending moment (My) is about 14 times the size of the lateral bending moment (Mx), which indicates that the pipe-roof has an obvious effect on My along the tunnel. Mx however cannot be neglected. (3) The maximum deflection difference between the hyperbolic model and Pasternak model is about 5%, and the calculated results are in good agreement with each other. The hyperbolic model considers the monotonous and bounded characteristics of sub-grade reaction varying with the displacement. The basis of the model is verified and extent of its accuracy is demonstrated.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:1755-1307-570-5-052070
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15621]
专题	中科院武汉岩土力学所
作者单位	1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan Hubei 430071, China 2.Changjiang Institute of Survey, Planning, Design and Research Co., Ltd., Wuhan Hubei 430010, China
推荐引用方式 GB/T 7714	Song,WU,Cheng-jie,ZHI,Hua,TANG,et al. Analysis of mechanical behavior of a pipe-roof based on model of anisotropic plate on elastic foundation[J]. IOP Conference Series: Earth and Environmental Science,2020,570(5).
APA	Song,WU,Cheng-jie,ZHI,Hua,TANG,&Yong-hao,DAI.(2020).Analysis of mechanical behavior of a pipe-roof based on model of anisotropic plate on elastic foundation.IOP Conference Series: Earth and Environmental Science,570(5).
MLA	Song,WU,et al."Analysis of mechanical behavior of a pipe-roof based on model of anisotropic plate on elastic foundation".IOP Conference Series: Earth and Environmental Science 570.5(2020).