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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (2): 725-734.DOI: 10.16552/j.cnki.issn1001-1625.2025.0449

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氧化镁激发矿粉-玄武岩纤维固化盾构渣土的强度与耐干湿循环性能

曹伟1(), 李新阳2, 刘福酉2()   

  1. 1.中铁第一勘察设计院集团有限公司,西安 710043
    2.成都理工大学地质灾害防治与地质环境保护全国重点实验室,成都 610059
  • 收稿日期:2025-04-30 修订日期:2025-09-24 出版日期:2026-02-20 发布日期:2026-03-09
  • 通信作者: 刘福酉,硕士研究生。E-mail:liufuyou@stu.cdut.edu.cn
  • 作者简介:曹伟(1984—),男,正高级工程师。主要从事岩土工程方向的研究。E-mail:270902962@qq.com
  • 基金资助:
    重庆市建设科技项目(城科字2021第4-9)

Strength and Dry-Wet Cycle Resistance of Magnesium Oxide-Activated Ground Granulated Blast Furnace Slag-Basalt Fiber Stabilized Shield Residues

CAO Wei1(), LI Xinyang2, LIU Fuyou2()   

  1. 1. China Railway First Survey and Design Institute Group Co. ,Ltd. ,Xi’an 710043,China
    2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China
  • Received:2025-04-30 Revised:2025-09-24 Published:2026-02-20 Online:2026-03-09

摘要:

本文研究了氧化镁激发矿粉(GGBS)-玄武岩纤维固化盾构渣土(改良试样),旨在探究固化剂(氧化镁激发矿粉-玄武岩纤维)对盾构渣土工程性能的改良作用。其中固化剂的掺量为渣土干质量的8%、15%和30%,m(MgO)∶m(GGBS)为1∶9~1∶3(干质量比),通过无侧限抗压强度试验和改良的干湿循环试验(酸性硫酸盐条件,pH=5.0),评价了改良试样的强度及耐干湿循环性能,并以水泥固化的盾构渣土作为对照组。结果表明,标准养护120 d时,改良试样(m(MgO)∶m(GGBS)=1∶7)的无侧限抗压强度相较于其他配比的改良试样提高了4%~24%。改良试样的pH值相比对照组低4%~7%。改良试样和对照组的质量变化与累积质量变化随干湿循环次数的增加而逐渐增大。10次干湿循环试验后,改良试样的无侧限抗压强度降低了22%,对照组的无侧限抗压强度降低了52%。综上所述,改良试样表现出更优的强度和耐干湿循环性能。

关键词: 氧化镁激发矿粉, 玄武岩纤维, 盾构渣土, 干湿循环, 固化

Abstract:

In this paper, the shield residues solidified by magnesium oxide (MgO)-activated ground granulated blast furnace slag (GGBS)-basalt fiber (referred to as “modified samples”) were studied, aiming to explore the improvement effect of this curing agent (MgO-activated GGBS-basalt fiber) on the engineering properties of shield residues. The dosage of the curing agent accounts for 8%, 15% and 30% of the dry mass of shield residues, and the dry mass ratio of MgO to GGBS (m(MgO)∶m(GGBS)) ranges from 1∶9 to 1∶3. The strength and dry-wet cycle resistance of the modified samples were evaluated via unconfined compressive strength tests and modified dry-wet cycle tests (under acidic sulfate condition, pH=5.0), with cement stabilized shield residues serving as the control group. The results show that: after 120 d of standard curing, the unconfined compressive strength of the modified sample with m(MgO)∶(GGBS)=1∶7 is 4%~24% higher than that of modified samples with other ratios. The pH value of the modified samples is 4%~7% lower than that of the control group. The mass variation and cumulative mass variation of both the modified samples and the control group increase gradually with the increase in the number of dry-wet cycles. After 10 dry-wet cycle tests, the unconfined compressive strength of the modified samples decreases by 22%, while that of the control group decreases by 52%. In conclusion, the shield residue samples solidified by MgO-activated GGBS-basalt fiber (modified samples) exhibit superior strength and dry-wet cycle resistance.

Key words: MgO-activated GGBS, basalt fiber, shield residue, dry-wet cycle, stabilization

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