Study on Comprehensive Control Measures of Underground Water in Large Section Subway Tunnel Excavated in Water-Rich Silty Sand Stratum
In this paper,based on the underground excavation of large section parking line tunnel project between Sanyuanqiao Station and Fan-gyuan Station of Beijing Metro Line 12,the paper analyzes the existing problems of the conventional cement-water glass double liquid grouting used in the grouting test section for ultra-shallow and deep-hole grouting,and proposes and carries out the combined grouting method of infil-tration grouting and split grouting.Based on the numerical results,the concept of"optimal deep hole grouting thickness"is proposed,and the advanced deep hole grouting reinforcement thickness is determined on this basis.In addition,in view of the interlayer water(3)between the fine sand layer and the silty clay layer,there is still residual water in tunnel excavation after deep hole grouting,a new vacuum well point de-watering method is proposed to improve the efficiency of hole formation and ensure the dewatering effect of well point.
Water rich fine sand formationPermeable groutingSplit groutingOptimal grouting thicknessWell point dewateringHole forming method
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