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彭    飛

（ 北京市政路橋集團（ 廣州） 建設有限公司 ，廣東 廣州 510700)

摘   要 ：受海水環境影響，常規盾構注漿材料不能完全適用于沿海地區地鐵隧道盾構工程施工建設 。為研究開發出能夠適應海水環境的新型盾構注漿材料，室內利用高爐礦渣粉末  ( BFSP) 替代常見注漿材料中的粉煤灰成分，并對新型 BFSP改性盾構注漿材料開展了綜合性研究試驗 。研究發現： ( 1) 海水拌制漿液的流動性強于淡水拌制漿液，凝結時間較短，剪切強度更低 。淡／海水拌制漿液的坍落度分別為 126 mm 、135 mm ,  初凝時間分別為 105 min 和 91 min ,  終凝時間分別為 195 min 和 172 min ,  剪切屈服強度分別為 0. 36 kPa 和 0. 28  kPa; (2)  海水環境下基礎盾構注漿漿液  (0BFSP)  坍落度可為 135 mm ,  隨著 BFSP 摻量的逐漸增大 ，新型注漿漿液 的坍落度逐漸降低，相較于基礎盾構注漿漿液分別下降 0. 74% 、2. 22% 、15. 56% 、24. 44% 以及 37. 04% ;   ( 3)  BFSP 材料的摻入顯著的縮短了新型注漿漿液的凝結時間，提高了結石試樣的抗壓強度 ；材料摻量對結石體抗折 強度的影響較為復雜，養護齡期較長條件下 ，抗折強度呈現出先增大后減小的變化趨勢 ； ( 4)  當 BFSP 摻量為 20%時新型盾構注漿材料的綜合性能最佳，此時其坍落度為 123 mm ,  初凝時間為 60 min ,  終凝時間為 109 min , 28 d 抗壓強度為 38. 82 MPa ,  28 d 抗折強度為 4. 68 MPa。

關鍵詞 ：地鐵盾構 ，注漿材料 ，高爐礦渣粉末 ，海水環境 ，凝結時間 ，最優配比

中圖分類號 ：U455 . 43           

文獻標志碼 ：A            

文章編號 ：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

作者簡介：彭飛(1978—) , 男，本科，主要研究方向：盾構法施工。

收稿日期：2022- 09- 06