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玄武岩纤维是一种环保高性能的无机材料。玄武岩纤维混凝土所具有的增强、增韧、阻裂等性能,对于控制软弱围岩隧道的变形具有重要的力学优势。通过钢筋混凝土和玄武岩纤维混凝土衬砌力学行为室内模型试验,对玄武岩纤维混凝土衬砌的承载特性进行研究。研究结果表明:相比钢筋混凝土,玄武岩纤维混凝土衬砌的初裂荷载提高了20%;掺入玄武岩纤维后衬砌结构的韧性增强,衬砌初裂后仍可承担较大的弯矩和变形。衬砌初裂前,钢筋混凝土和玄武岩纤维混凝土衬砌支护特性曲线基本成线形变化;衬砌初裂后,钢筋混凝土衬砌支护特性曲线在缓慢上升后,快速趋于收敛;玄武岩纤维混凝土衬砌承载特性曲线缓慢上升,至2倍初裂荷载时仍无收敛迹象。因此,玄武岩纤维混凝土能较好地满足软弱围岩隧道尽早封闭岩面、尽快提供支护力并具有一定变形能力的要求。研究成果对于软岩大变形隧道的变形控制具有重要的意义。
Basalt fiber is an environmentally friendly, high-performance inorganic material. Basalt fiber reinforced concrete has the properties of strengthening, toughening and blocking, which have important mechanical advantages for controlling the deformation of soft surrounding rock tunnel. Through the indoor model test of reinforced concrete and basalt fiber reinforced concrete lining, the bearing characteristics of basalt fiber reinforced concrete lining were studied. The results show that the initial load of basalt fiber reinforced concrete lining increases by 20% compared with that of reinforced concrete, the toughness of lining structure after basalt fiber incorporation is enhanced, and the large bending moment and deformation of lining can still be taken after initial cracking. Before lining the initial cracking, the supporting and supporting characteristics of the reinforced concrete and the basalt fiber reinforced concrete lining basically changed linearly. After the initial cracking of the lining, the supporting and supporting characteristics of the reinforced concrete lining quickly converged after slowly rising. The load-bearing characteristic curve of the basalt fiber reinforced concrete lining Slowly rising to 2 times the initial crack load is still no signs of convergence. Therefore, basalt fiber reinforced concrete can better meet the soft rock tunnel closure of rock face as soon as possible to provide support force as soon as possible and have a certain deformation capacity requirements. The research results are of great significance to the deformation control of the large deformed soft rock tunnel.