关键词: TBM, 变形预测, 反演, 软岩洞段

Abstract:

In TBM construction, in order to avoid jamming accident caused by soft rock deformation, the accurate prediction of tunnel surrounding rock deformation is necessary. Taking N-J Hydropower Station in Pakistan as a case, the creep parameters of soft rock was obtained by inverse analysis of deformation monitoring data, and the creep parameters were used to predict the deformation of the surrounding rock with large buried depth. The prediction results showed that the evident elastic-plastic deformation and creep deformation occurred in the tunneling process, and the creep deformation increases quickly in a few hours after the TBM excavation, which increases the risk of TBM jamming. Therefore, under the premise of safety, the TBM should tunnel through the soft rock as quickly as possible during the soft rock excavation.

Key words: TBM, deformation prediction, inverse analysis, soft rock tunnel
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