Study on the Influence of Shield Synchronous Grouting Slurry Performance and the Optimization of its Proportion
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摘要: 盾构施工过程中良好性能的同步注浆浆液有利于对地层沉降的有效控制，为了研究不同浆液性能对地表沉降的影响效果，以哈尔滨地铁2号线哈尔滨北站—大耿家站盾构区间为工程背景，考虑浆液强度、初凝时间、结石率三种特性，运用有限差分软件FLAC3D对隧道开挖引起的地层沉降进行了模拟，分析了不同浆液特性对地表沉降的影响。在此基础上，还通过不同浆液的配比试验对浆液的强度、初凝时间、泌水率和稠度特性进行了分析，获得了浆液的最优配比。结果表明：强度大、初凝时间短、结石率高的浆液对地表沉降的控制效果最好；水泥的用量会增加浆液强度、缩短初凝时间，但在富水地层中，还需要考虑水中的凝结效果和稠度指标。研究可为盾构施工中同步注浆浆液性能的改进提供一定的借鉴和指导。Abstract: Synchronous grouting with good performance during shield construction is conducive to effective control of ground surface settlement. In order to study the effects of different grout properties on ground settlement, the shield tunnel section of Harbin North Station-Dagengjia Station on Harbin Metro Line 2 was taken as the engineering background. Considering the three characteristics of slurry strength, initial setting time, and stone rate, the finite difference software FLAC3D was used to simulate the ground settlement caused by tunnel excavation, and the influence of different characteristics on ground settlement was analyzed. On this basis, the strength, initial setting time, bleeding rate and consistency characteristics of the slurry were analyzed through the ratio test of different slurries, and the optimal ratio of the slurry was obtained. The results show that: the slurry with high strength, short initial setting time and high stone rate has the best control effect on surface settlement. The amount of cement will increase the strength of the slurry and shorten the initial setting time. However, in water-rich formations, the water setting effect and consistency indicators need to be considered. This study can provide a certain reference and guidance for the improvement of synchronous grouting performance in shield construction.
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Key words:
- shield /
- synchronous grouting /
- FLAC3D /
- ground surface settlement /
- optimal proportion
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表 1 地层参数情况
土层 密度ρ/(g·cm−3) 内摩擦角φ/(°) 黏聚力c/kPa 弹性模量E/MPa 泊松比ν 杂填土 1.60 8.00 10 3 0.3 粉质黏土 1.80 20.10 21.20 4.47 0.35 粉土 1.92 28.50 3.00 7.15 0.31 细砂 1.95 30.00 2.00 14.12 0.29 中砂 1.96 33.00 0 15.53 0.28 
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表 2 试验浆液材料配比情况
配比组 水泥/g 粉煤灰/g 膨润土/g 砂/g 水/g 合计/g 水灰质量比 水胶质量比 1 936 1860 366 4962 2736 10860 2.92 0.98 2 1140 1860 366 4962 2736 10860 2.4 0.91 3 1440 1860 366 4962 2736 10860 1.9 0.82
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表 3 浆液配比试验过程及结果
试验 过程图 指标 组1 组2 组3 单轴压缩 
单轴抗压强度/ MPa 自然凝结 0.31 0.57 1.39 水中凝结 0.34 0.58 1.15 维卡仪 
初凝时间/h 6.5 5.5 4.7 泌水率 
泌水率/% 1.07 2.08 2 稠度仪 
稠度/cm 11.7 11.9 9.5
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