下穿既有地铁的新建盾构隧道壁后注浆浆液配合比研究

作者：吴俊¹’²,陈志强¹’²,简兴超¹’²,李明晋¹’²

作者简介：

吴俊,高级工程师,E⁃mail:wujun_bjtu@ 163. com

作者单位：

1. 中建三局基础设施建设投资有限公司,湖北武汉 430073; 2. 中建三局集团有限公司,湖北武汉 430064

摘要：

为解决富水砂卵石地层盾构机下穿既有地铁引起的沉降问题,依托成都轨道交通 27 号线一期工程,开展富水砂卵石地层盾构隧道壁后注浆充填材料配合比与性能试验研究. 为满足注浆浆液的高流动性和不包裹盾体的慢凝固特性要求,采用正交试验研究不同配合比下注浆浆液的工程特性,确定具有高流动性、低泌水率和慢凝结时间的最优配合比,并将其应用于实际工程中,最大地层沉降控制在 6mm 内,适用于上述地层条件.

关键词：盾构;隧道;注浆;配合比;试验

English：

To solve the settlement problem caused by shield machine undercrossing the existing subway inwater⁃rich sandy pebble stratum, based on Phase⁃I Project of Chengdu Rail Transit Line 27, the mixtureratio and performance tests of grouting filling material behind shield tunnel wall in water⁃rich sandypebble stratum are carried out. To meet the requirements of high fluidity of grouting slurry and slowsolidification characteristics of unencapsulated shields, the engineering characteristics of grouting slurryunder different mixture ratios were studied by orthogonal tests. The optimal mixture ratio of grouting slurrywith high fluidity, low bleeding rate, and slow setting time was determined and was applied to practicalengineering. And the maximum ground settlement is controlled within 6mm, which is suitable for theabove formation conditions.

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岩土与地下工程 > 2025年 第卷 第11期