RESEARCH ON DEFORMATION CONTROL TECHNOLOGY OF LARGE SECTION LOESS TUNNEL CONSTRUCTION
The conventional deformation control technology for loess tunnel construction mainly uses the single point temporary inverted arch method to control the excavation step distance of the tunnel,which is easily affected by changes in the water content of the tunnel section,resulting in excessive deformation and settlement of the tunnel arch.Therefore,a new deformation control technology for large cross-section loess tunnel construction is designed.Firstly,excavate the construction guide hole of the large cross-section loess tunnel,then support the steel arch frame of the large cross-section loess tunnel construction,and finally grout and reinforce the surrounding rock of the tunnel to achieve deformation control during the construction of the large cross-section loess tunnel.The example analysis results show that after using the designed deformation control technology for large cross-section loess tunnel construction,the deformation settlement of the arch at each monitoring point of the tunnel is relatively low,which can meet the deformation control requirements for large cross-section loess tunnel construction.
large sectiongeology of loessconstruction of tunneldeformation control
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