Flexural toughness characteristics of basalt fiber reinforced shotcrete composites in high geothermal environment
Flexural toughness characteristics of basalt fiber reinforced shotcrete composites in high geothermal environment
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高地热环境下玄武岩纤维增强喷射混凝土复合材料的弯曲韧性特性
DOI：
10.1016/j.conbuildmat.2021.123893
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发表时间：
2021-09
影响因子：
7.4
通讯作者：
Niu Ditao
中科院分区：
文献类型：
--
作者：
Zhang Shaohui;Wang Yan;Tong Yueping;Chen Yahao;Li Zhaoguang;Niu Ditao
高地热隧道环境下的喷射混凝土应具有足够的韧性，以帮助稳定围岩并抵抗围岩的变形。本文研究了玄武岩纤维（BF）含量为0.1%~0.4%的喷射混凝土复合材料在模拟高地热环境（20℃~60℃）下的破坏裂纹长度、弯曲强度、荷载-挠度曲线和能量吸收情况，并建立了弯曲韧性计算模型。结果表明，高温养护和添加BF后，喷射混凝土的弯曲破坏裂缝分别增加了245.0%～445.0%和88.9%～133.0%。 60℃有利于BF增强喷射混凝土复合材料（BFRSC）的弯曲强度，提高幅度为25.4%至51.5%。 BFRSC荷载-挠度曲线的显着特点是观察不到峰后曲线。高温有利于提高喷射混凝土的变形能力，特别是40℃养护。 0.3%BF的含量对提高喷射混凝土的抗弯韧性效果最好，其中90天能量吸收提高26.1%。高地热环境下喷射混凝土的弯曲韧性可以根据复合材料理论计算，考虑取向有效系数、长度有效系数和界面粘附系数。
The shotcrete in high geothermal tunnel environments should have enough toughness to help the surrounding rock stabilize and resist the deformation of the surrounding rock. In this paper, the failure crack length, flexural strength, load–deflection curve and energy absorption of shotcrete composites with 0.1%–0.4% basalt fiber (BF) content in simulated high geothermal environment (20 ℃~60 ℃) were investigated, and the calculation model of flexural toughness was established. The results showed that the flexural failure cracks of shotcrete increased by 245.0% ~ 445.0% and 88.9% ~ 133.0% by curing at high temperature and adding BF. The 60 ℃ is beneficial to the flexural strength of BF reinforced shotcrete composites (BFRSC), with an increase range of 25.4% to 51.5%. The obvious characteristic of load–deflection curve of BFRSC is that no post-peak curve can be observed. The high temperature is conducive to the improve the deformability of shotcrete, especially 40 ℃ curing. The content of 0.3% BF is the best to enhance the flexural toughness of shotcrete, in which the 90-day energy absorption increases by 26.1%. The flexural toughness of shotcrete in high geothermal environment can be calculated according to the composite material theory considering orientation effective coefficient, length effective coefficient, and interfacial adhesion coefficient.
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