隧道高性能支护喷射纤维混凝土配比试验研究Experimental Study on High Performance Fiber Shotcrete Ratio for Tunnel Support
霍建勋,林传年,刘喆
HUO Jianxun,LIN Chuannian,LIU Zhe
摘要(Abstract):
川藏铁路隧道面临软岩大变形、高烈度、高地应力、岩爆、高地温和活动断裂等工程难题,纤维喷射混凝土初期支护因其具有及时性、与围岩密贴性、较强耐久性,可很好地适用于川藏铁路复杂地质环境。为研究高性能支护喷射混凝土配合比,采用室内试验、理论分析等方法,研究不同纤维种类、混杂方式对喷射混凝土抗压抗折、弯曲韧性的影响规律,并提出高强纤维喷射混凝土的最优配合比。试验结果表明:(1)相同体积掺量下,掺入端钩型钢纤维和波纹型钢纤维均能大幅度提升喷射混凝土各个龄期的抗压强度,波纹型钢纤维对抗压强度的提升优于端钩型钢纤维,而高强仿钢纤维介于两者之间;(2)两种纤维复掺试验中,端钩型钢纤维和聚丙烯纤维复掺对喷射混凝土抗压强度增强效果最好。
The tunnel of Sichuan-Tibet railway is faced with engineering problems such as large deformation of soft rock, high intensity, high ground stress, rockburst, high ground temperature and active fault. The timeliness, close adherence with surrounding rock of the fiber shotcrete in the initial support and its durability are suitable for the complex geological environment of Sichuan Tibet railway. In order to study the mix proportion of Shotcrete for high performance support, indoor test and theoretical analysis are conducted to study the influence of different fiber types and hybrid ways on the compressive and flexural strength of the shotcrete and propose the optimal mix proportion of high strength fiber shotcrete. The experimental results show that:(1)With the same volume proportion, the compressive strength of shotcrete at different ages can be greatly improved by adding end hook steel fiber and corrugated steel fiber. The compressive strength of the corrugated steel fiber is better than that of the end hook type steel fiber, and that of the high strength steel imitation fiber is between the two.(2)The compound mixing experiment of the two kinds of fibers shows that the compressive strength of shotcrete is the best when the end hook steel fiber and polypropylene fiber are mixed together.
关键词(KeyWords):
川藏铁路;高强纤维喷射混凝土;力学性能;混杂复掺;最优配合比
Sichuan-Tibet Railway;high strength fiber shotcrete;mechanical property;hybrid compound mixing;optimum mix proportion
基金项目(Foundation): 国家铁路局课题研究计划项目(KF2019-021)
作者(Author):
霍建勋,林传年,刘喆
HUO Jianxun,LIN Chuannian,LIU Zhe
DOI: 10.13238/j.issn.1004-2954.202106080002
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