浅埋偏压隧道洞口段合理开挖工序及受力特征分析

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Abstract The portal section of shallow tunnel with unsymmetrical loadings is a typical three-dimensional problem，the main initial geostress of which is gravity stress. The relatively real initial geostress can be obtained by accurately simulating the topographical and geologic conditions，which can increase the reliability of the calculation result. Analysis of three-dimensional simulation in the excavation process of portal section of shallow tunnel with unsymmetrical loadings of Laozhai tunnel in Guizhou province of Xiamen—Chengdu Expressway is conducted by using the fast Lagrangian analysis of continua in 3 dimensions(FLAC3D) program. Comparing excavated shallow part firstly with excavated deep part firstly by the annular pilot heading conservation core soil method，the changes of deformations and stresses of rock mass and supporting structure of Laozhai tunnel in different excavation sequences are obtained. Actual tunnel excavation sequence is optimized by comparison；and the rationality of excavation scheme is explained by the method of released load and the method of principal stress trace. Finally，through analyzing and calculating the measured data of three measured sections in site，the stress characteristics of surrounding rock and supporting structure of Laozhai tunnel portal section are obtained. The analysis results can provide technical guidance for the design and construction of Laozhai tunnel and the tunnel which has the similar topographical and geologic conditions.

Key words： tunnelling engineering shallow tunnel with unsymmetrical loadings excavation sequence deformation contact pressure

Received: 11 June 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS1/3066

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