Analysis of stability of tunnel in backfill based on FLAC3D

doi:10.16265/j.cnki.issn1003-3033.2017.08.015

Abstract

Abstract: To investigate the influence of excavation on the stability of cemented backfill, a model was built for backfill by using FLAC^3D software. The model's rationality was verified by analytic solution. The stress field in the backfill after excavation was analyzed with the model. And then the stability was evaluated by using the damage theory. Furthermore, the degree of stability of the backfill as a function of its height was investigated after excavation. The results show that the excavation of the tunnel makes the inner straight wall section and the arch of the tunnel produce arch stress concentration, and an U shape settlement appear in the middle of backfill, that the highest damage value appears in the central part of the straight wall, that when the height of backfill is 62 m, the maximum strain of the straight wall is about 0.003, and the corresponding damage value is still lower than the warning value.

Key words: cemented backfill, tunnel in backfill, numerical simulation, damage mechanics, stability analysis

CLC Number:

ZHANG Shuaishuai, YIN Tubing. Analysis of stability of tunnel in backfill based on FLAC^3D[J]. China Safety Science Journal, 2017, 27(8): 85-90.

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Analysis of stability of tunnel in backfill based on FLAC^3D

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