Analysis of the bearing characteristics of the segment-bean gravel-surrounding rock combination structure

Abstract

The combined structure of segment-bean gravel-surrounding rock is the main bearing structure of TBM with pressure water transmission tunnel. Taking the TBM section of the water transmission tunnel in Hubei as the research object, the three-dimensional finite element numerical analysis model of segment-bean gravel-surrounding rock combined structure is established, and the internal pressure bearing characteristics of the combined structure under the influence of excavation load release are considered. The result show that considering the overall stress, joint opening and bolt stress in the case of partial excavation load release, it is more beneficial to the segment to bear the inner water pressure; the main location near the inclined bolt will affect the crack distribution; the wedge cap affects the stress distribution of the segment bolt under the inner water pressure, and the internal water pressure under the inner water pressure.

Keywords

segment-bean gravel-surrounding rock combination structure / TBM / bearing characteristic / inner water pressure / surrounding rock