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彭    飞

（ 北京市政路桥集团（ 广州） 建设有限公司 ，广东 广州 510700)

摘   要 ：受海水环境影响，常规盾构注浆材料不能完全适用于沿海地区地铁隧道盾构工程施工建设 。为研究开发出能够适应海水环境的新型盾构注浆材料，室内利用高炉矿渣粉末  ( BFSP) 替代常见注浆材料中的粉煤灰成分，并对新型 BFSP改性盾构注浆材料开展了综合性研究试验 。研究发现： ( 1) 海水拌制浆液的流动性强于淡水拌制浆液，凝结时间较短，剪切强度更低 。淡／海水拌制浆液的坍落度分别为 126 mm 、135 mm ,  初凝时间分别为 105 min 和 91 min ,  终凝时间分别为 195 min 和 172 min ,  剪切屈服强度分别为 0. 36 kPa 和 0. 28  kPa; (2)  海水环境下基础盾构注浆浆液  (0BFSP)  坍落度可为 135 mm ,  随着 BFSP 掺量的逐渐增大 ，新型注浆浆液 的坍落度逐渐降低，相较于基础盾构注浆浆液分别下降 0. 74% 、2. 22% 、15. 56% 、24. 44% 以及 37. 04% ;   ( 3)  BFSP 材料的掺入显著的缩短了新型注浆浆液的凝结时间，提高了结石试样的抗压强度 ；材料掺量对结石体抗折 强度的影响较为复杂，养护龄期较长条件下 ，抗折强度呈现出先增大后减小的变化趋势 ； ( 4)  当 BFSP 掺量为 20%时新型盾构注浆材料的综合性能最佳，此时其坍落度为 123 mm ,  初凝时间为 60 min ,  终凝时间为 109 min , 28 d 抗压强度为 38. 82 MPa ,  28 d 抗折强度为 4. 68 MPa。

关键词 ：地铁盾构 ，注浆材料 ，高炉矿渣粉末 ，海水环境 ，凝结时间 ，最优配比

中图分类号 ：U455 . 43           

文献标志码 ：A            

文章编号 ：1005- 8249  (2023)   05- 0065- 06

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 05 . 011

PENG Fei

(Beijing Municipal Road and Bridge Group  (Guangzhou)  Construction  Co.  ，Ltd. ，Guangzhou 510700 ,   China)

Abstract: Due to the influence of sea water environment, conventional shield grouting materials can not be fully applicable to the construction of metro tunnel shield in coastal areas. In order to research and develop a new type of shield grouting material that can adapt to the seawater environment, blast furnace slag powder (BFSP) is used to replace the fly ash in common grouting materials in the laboratory, and comprehensive research and tests are carried out on the new type of BFSP modified shield grouting material. The results show that: (1) the fluidity of seawater mixed pulping liquid is stronger than that of fresh water mixed pulping liquid, the setting time is shorter, and the shear strength is lower. The slump of fresh / seawater mixed slurry is 126 mm and 135 mm respectively, the initial setting time is 105 min and 91 min respectively, the final setting time is 195 min and 172 min respectively, and the shear yield strength is 0.36 kPa and 0.28 kPa respectively; (2) The slump of the foundation shield grouting slurry (0% BFSP) under the seawater environment can be 135 mm. With the gradual increase of BFSP content, the slump of the new grouting slurry gradually decreases, which is 0.74%, 2.22%, 15.56%, 24.44% and 37.04% lower than that of the foundation shield grouting slurry respectively; (3) The addition of BFSP material significantly shortens the setting time of the new grouting slurry and improves the compressive strength of the stone sample; The influence of material content on the flexural strength of stone body is complex. Under the condition of long curing period, the flexural strength shows a trend of increasing first and then decreasing; (4) When the BFSP content is 20%, the comprehensive performance of the new shield grouting material is the best. At this time, the slump is 123 mm, the initial setting time is 60 min, the final setting time is 109 min, the 28 d compressive strength is 38.82 MPa, and the 28 d flexural strength is 4.68 MPa.

Keywords: metro shield, grouting materials, blast furnace slag powder, seawater environment, setting time, optimal ratio

作者简介：彭飞(1978—) , 男，本科，主要研究方向：盾构法施工。

收稿日期：2022- 09- 06