隧道开挖数值模拟的围岩边界取值范围研究

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Abstract Research purposes: The numerical simulation of tunnel has been widely used． In the numerical simulation process，how to choose the reasonable boundaries for the project and how to balance the relationship between the calculation precision and the occupation of the internal memory of the computer and how to choose the perfect combined pont are the important parts in the modeling for tunnel． This paper presents the four kinds of the numerical simulations of the two times tunnel span，three times tunnel span，five times tunnel span and eight times tunnel span for choosing the boundary range． The general boundary range of the surrounding rock model is offered based on the comparison of results of the first principal stress，displacement and plastic zone．

Research conclusions: It is shown that the effect of different boundary ranges of tunnel on the surrounding stress field and displacement field can be ignored in simulation． It is also suggested that the boundary range of the three times tunnel is used for the numerical simulation and structure design，and it can get good analysis result and safe structure design．

Key words： tunnel boundary range numerical simulation surrounding rock

Received: 05 February 2011

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TU94 + 1

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Cite this article:

SU Xiao － kun. Research on Choosing Boundary Range of Surrounding Rock in Numerical Simulation of Tunnel Excavation[J]. 铁道工程学报, 2012, 29(3): 64-68.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I3/64

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