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Mechanical Properties of High-Performance Steel-Fibre-Reinforced Concrete and Its Application in Underground Mine Engineering

机译：高性能钢纤维混凝土的力学性能及其在地下矿山工程中的应用

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摘要

In order to economically and reasonably solve the problem of mineshaft support in complex geological conditions, the mechanical properties of high-performance steel-fiber-reinforced concrete (HPSFRC) and its application in mineshaft lining structures were investigated in this study. Firstly, the mix proportion of HPSFRC for the mineshaft lining structure was obtained through raw material selection and preparation testing. Then, a series of mechanical property tests were conducted. The test results showed that the compressive, flexural, and tensile strengths of HPSFRC were 9%, 71%, and 53% higher than that of ordinary concrete, respectively. The fracture toughness of HPSFRC was 75% higher than that of the ordinary concrete and the fracture energy of HPSFRC was 16 times that of the ordinary concrete. Finally, the model test results of the HPSFRC shaft lining structure showed that the crack resistance, toughness, and bearing capacity of the shaft lining structure had been significantly improved under a non-uniform confining load because of the replacement of ordinary concrete with HPSFRC. HPSFRC was proved to be an ideal material for mineshaft support structures under complex geological conditions.
机译：为了经济，合理地解决复杂地质条件下井筒支护问题，研究了高性能钢纤维增强混凝土的力学性能及其在井筒衬砌结构中的应用。首先，通过原料选择和制备试验，获得了矿井衬砌结构中HPSFRC的配合比。然后，进行了一系列的机械性能测试。测试结果表明，HPSFRC的抗压强度，抗弯强度和抗拉强度分别比普通混凝土高9％，71％和53％。 HPSFRC的断裂韧性比普通混凝土高75％，HPSFRC的断裂能是普通混凝土的16倍。最后，HPSFRC轴衬结构的模型试验结果表明，由于用HPSFRC代替普通混凝土，在非均匀约束载荷下，轴衬结构的抗裂性，韧性和承载能力得到了显着改善。事实证明，HPSFRC是矿井支护结构在复杂地质条件下的理想材料。

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