Large mud and water gushing and soft rock deformation often occur in-tunnel sections with poor geology.Therefore,an L-shaped ground directional drilling and grouting with an entire hole length of over 500 m assisted by in-tunnel advance grouting is proposed for the construction of the Xianglushan tunnel of the Central Yunnan water-conveyance project.The specific design scheme of the proposed method is determined.First,the on-site geological survey results reveal the technical difficulties of the unfavorable geological sections of the Xianglushan tunnel.The construction process and grouting technology of the L-shaped directional drilling grouting are explained.Second,a ground reinforcement scheme for L-shaped ground advance grouting is designed to improve the stratum stability.Finally,the on-site grouting effect is illustrated by tunnel face revelation,grouting results,and magnetotelluric analysis.The results show that the Z1+Z2+Z4 drilling field design is the optimal ground advance grouting scheme,and the L-shaped directional drilling grouting assisted with advance in-tunnel grouting technology can cover the grouting area in the blind area,realizing advance reinforcement.
deep-buried tunnelwater-conveyance tunnelbad geology sectionmud and water gushingsoft rock large deformationL-shaped ground directional drilling and grouting
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