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海維深¹  ,  李正虎²  ,  和振海^3 ,4  ,  劉    云²  ,  楊新志²  ,  梁    滔²  ,  郝倩倩²

 

(1 .  云南省公路科學技術研究院，云南 昆明 650000  ;  2.  云南勐綠高速公路投資開發有限公司，云南 普洱 665000; 3 .  中鐵開發投資集團有限公司 ，云南 昆明 650000 ;  4.  中鐵開投勐綠高速工程指揮部 ，云南 普洱 665000)

摘   要 ：針對隧道噴射混凝土回彈率較高的問題，選用一種微納米粉體降彈劑改良噴射混凝土的性能。對降彈劑摻加 3% 、6% 、9% 、12% 和 15% 的膠砂流動度和抗折、抗壓強度進行試驗；開展單摻粉煤灰 、復摻粉煤灰與降彈劑不同配合比 C25 濕噴混凝土的回彈率研究。結果表明： 隨降彈劑摻量增加，膠砂流動度減小，膠砂 1   和 3 d 的抗折 、抗壓強度逐漸降低 ，28 d 的抗折、抗壓強度均先增大后降低，摻量為 6% 時強度最大，28 d 抗折、 抗壓強度比分別為 1 . 049 和 1 . 014 ;  復摻粉煤灰與降彈劑濕噴混凝土的回彈率顯著低于粉煤灰濕噴混凝土的回彈率，膠凝材料總量為 430 kg/m3 、復摻 14% 粉煤灰與 6% 降彈劑的綜合回彈率最低，為 8. 09% 。摻加6% 降彈劑能夠促進噴射混凝土抗壓強度增長，減小膠凝材料用量。研究成果可供類似工程參考和借鑒。

關鍵詞： 隧道工程 ；噴射混凝土 ；回彈率 ；配合比 ；降彈劑

中圖分類號：TU528 . 041            

文獻標志碼：A            

文章編號： 1005- 8249  (2024)  06- 0019- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.004

 

HAI Weishen¹  ,  LI Zhenghu² ,  HE Zhenhai³ , ⁴ ,  LIU Yun² ,  YANG Xinzhi² ,  LIANG Tao² ,  HAO Qianqian²

(1 . Yunnan Science & Technology Research Institute of Highway ,  Kunming 650000 ,  China; 2. Yunnan Menglv Expressway Investment Development Co. ，Ltd. ，Pu ’er 665000 ,  China; 3 . China Railway Development & Investment Group Co. ，Ltd. ，Kunming 650000 ,  China;

4. Menglv Expressway Engineering Headquarters of China Railway

Development & Investment Group Co. ，Ltd. ，Pu ’er 665000 ,  China)

Abstract: In response to the challenge of high rebound rates in tunnel shotcrete applications, a micro-nano powder additive has been selected to enhance the performance of shotcrete. The fluidity, flexural and compressive strength of mortar samples containing 0%, 3%, 6%, 9%, 12%, and 15% of the additive by mass were tested. Additionally, an investigation into the rebound rate of C25 wet-mixed shotcrete was conducted, comparing formulations with single additions of fly ash and composite mixtures incorporating both fly ash and the additive at various proportions. The results showed that the fluidity of mortars decreases with the increase of the dosage of additive, the flexural and compressive strengths in 1d and 3d decrease gradually, and the flexural and compressive strengths of mortars in 28d increase first and then decrease. The flexural and compressive strengths of mortar specimens in 28d is the highest when adding 6% micro-nano additive , and the flexural and compressive strength ratio in 28d are 1.049 and 1.014. The rebound rate of wet sprayed concrete mixed with fly ash and additive is significantly lower than that of wet sprayed concrete with fly ash, the total amount of cementitious material is 430kg/m3, and the comprehensive rebound rate is the lowest when mixed with 14% fly ash and 6% additive, which is 8.09%. Adding 6% additive can promote the increase of compressive strength of shotcrete and reduce the amount of cementitious material. The research results can provide reference and inspiration for similar engineering projects.

Keywords: tunneling；wet-mix shotcrete；shotcrete-rebound；mix proportion；tackifier

*基金項目：云南省交通運輸廳科技創新及示范項目  (2021- 102) ;  中鐵開發投資集團有限公司科技研究開發計劃項目  (2022- B 類- 05) 。

作者簡介：海維深  (1993—) ,  男，碩士，工程師，研究方向： 噴射混凝土和巖土工程。

收稿日期：2024- 01 - 28