层状地基中盾构隧道开挖非均匀收敛引起临近管道变形预测

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Abstract The elastic layered soil model is adopted to consider the soil non-homogeneous characters. The oval- shaped soil deformation model is imposed to the tunnel opening boundaries，and the boundary element method based on displacement-controlled technique is presented to analyze the free soil displacement. The displacement- controlled method is put forward to predict the deformation of adjacent pipeline due to non-uniform convergence of shield tunnelling in multi-layered soils. The accuracy of the proposed method is demonstrated with the displacement-controlled finite element numerical analysis and existing centrifuge model tests. The results indicate that the solution of the free soil deformation is rather important to estimate the effects on adjacent pipeline. It is also shown that the soil non-homogeneity，neglected in previous methods，has a significant influence on the deformation behaviors of municipal pipelines induced by tunnelling in multi-layered soils. The proposed method may provide a theoretical basis for proposing correctly protective measurements of existing pipelines influenced by adjacent underground construction.

Key words： tunnelling engineering shield tunnelling pipeline layered soils non-uniform convergence displacement-controlled method(DCM)

Received: 25 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I09/1867

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