钢纤维喷射混凝土巷道初期支护技术的研究及其应用
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摘要
钢纤维混凝土是一种新型的复合材料,它具有抗拉性能好,抗冲击能力强等特点。而喷射钢纤维混凝土支护技术在降低施工难度的同时,不仅具有钢纤维混凝土的这一系列的优点,而且具有良好的经济效益。本文主要研究在巷道快速掘进中将钢纤维喷射混凝土运用于巷道支护体系并在巷道支护初期代替钢筋网使用的技术。
文章首先介绍了课题来源和钢纤维混凝土、喷射钢纤维混凝土的发展历史和国内外研究现状。通过对钢纤维喷射混凝土和挂网喷射混凝土的破坏机理、支护机理的研究,提出了钢纤维喷射混凝土和挂网喷射混凝土巷道初期支护模型并进行了比较计算。研究表明:从抗拉能力的角度,钢纤维喷射混凝土可以替代挂网喷射混凝土用于巷道支护。
采用液压伺服万能试验机和Hopkinson压杆(SHPB)对素混凝土、钢纤维混凝土的抗压、抗拉、动态冲击性能进行了研究。探讨了巷道支护中用钢纤维混凝土代替素混凝土实施初支护的可行性,并分别对钢纤维混凝土进行了静态、动态以及动静组合加载下的力学性能对比实验结果进行了分析,为钢纤维喷射混凝土巷道初期支护提供理论依据。研究表明:钢纤维混凝土的抗压、抗拉能力均优于素混凝土且具有优良的抗冲击能力,可以作为一种优良的巷道支护材料用于巷道支护,适合巷道支护的最佳钢纤维体积率为1%。
在室内实验结果论证钢纤维喷射混凝土替代挂网喷射混凝土用于巷道初期支护的理论基础上,在开阳磷矿马路坪矿+700开拓巷道进行了现场工业试验。工业试验结果表明:用钢纤维混凝土和树脂锚杆代替砂浆锚杆挂网支护,不仅可以达到有效支护目的,而且还可以减少作业工序,大大提高了工作效率。
Steel fiber reinforced concrete is a new type of composite material with advantage of high ductility and impact resistance. This thesis is focused on steel fiber reinforced sprayed concrete superseding mesh sprayed concrete in tunnel initial support. It not only could reduce construction difficulty, but also has the fine ductility, toughness and obvious economic effect.
The thesis choosing resource and the development history and foreign research status of the steel fiber reinforced concrete, steel fiber reinforced sprayed concrete are introduced firstly. Through research the failure mechanism and the supporting mechanism of steel fiber reinforced concrete and the mesh sprayed concrete, two mechanical models of steel fiber reinforced concrete and the mesh sprayed concrete are put forward. Some conclusions have been draw during the analysis. Steel fiber reinforced sprayed concrete can supersede mesh sprayed concreter in tunnel supporting from the tensile strength.
This thesis is focused on the research the compressive strength, splitting tensile strength, the dynamic impact property of the plain concrete and the steel-fiber concrete using the Hydraulic pressure servo universal testing machines and the Split-Hopkins on pressure bar(SHPB) test. The feasibility using steel-fiber concrete as a substitute for plain concrete in tunnel support was studied. Compared test of steel-fiber concrete under static, dynamic and static-and-dynamical combination load were carried out. Some conclusions have been draw during the analysis. The compressive strength, splitting tensile strength of Steel fiber reinforced concrete surpass the concrete and steel fiber reinforced concrete have excellent impact resistance. It is a fine tunnel supporting material and the optimal influence of fiber volume ratio fitting is 1 %.
It proves that steel-fiber reinforced sprayed concrete can supersede mesh sprayed concrete in tunnel supporting based on the test and we carry on the industry test in MaLuPing Mine Company of Kailin Group +700 level ground tunnel. The industrial test results indicated that the applied support scheme was better, not only steel-fiber concrete could control the surrounding rock's deformation, but also it could reduce working procedure and advance work efficiency greatly.
文章首先介绍了课题来源和钢纤维混凝土、喷射钢纤维混凝土的发展历史和国内外研究现状。通过对钢纤维喷射混凝土和挂网喷射混凝土的破坏机理、支护机理的研究,提出了钢纤维喷射混凝土和挂网喷射混凝土巷道初期支护模型并进行了比较计算。研究表明:从抗拉能力的角度,钢纤维喷射混凝土可以替代挂网喷射混凝土用于巷道支护。
采用液压伺服万能试验机和Hopkinson压杆(SHPB)对素混凝土、钢纤维混凝土的抗压、抗拉、动态冲击性能进行了研究。探讨了巷道支护中用钢纤维混凝土代替素混凝土实施初支护的可行性,并分别对钢纤维混凝土进行了静态、动态以及动静组合加载下的力学性能对比实验结果进行了分析,为钢纤维喷射混凝土巷道初期支护提供理论依据。研究表明:钢纤维混凝土的抗压、抗拉能力均优于素混凝土且具有优良的抗冲击能力,可以作为一种优良的巷道支护材料用于巷道支护,适合巷道支护的最佳钢纤维体积率为1%。
在室内实验结果论证钢纤维喷射混凝土替代挂网喷射混凝土用于巷道初期支护的理论基础上,在开阳磷矿马路坪矿+700开拓巷道进行了现场工业试验。工业试验结果表明:用钢纤维混凝土和树脂锚杆代替砂浆锚杆挂网支护,不仅可以达到有效支护目的,而且还可以减少作业工序,大大提高了工作效率。
Steel fiber reinforced concrete is a new type of composite material with advantage of high ductility and impact resistance. This thesis is focused on steel fiber reinforced sprayed concrete superseding mesh sprayed concrete in tunnel initial support. It not only could reduce construction difficulty, but also has the fine ductility, toughness and obvious economic effect.
The thesis choosing resource and the development history and foreign research status of the steel fiber reinforced concrete, steel fiber reinforced sprayed concrete are introduced firstly. Through research the failure mechanism and the supporting mechanism of steel fiber reinforced concrete and the mesh sprayed concrete, two mechanical models of steel fiber reinforced concrete and the mesh sprayed concrete are put forward. Some conclusions have been draw during the analysis. Steel fiber reinforced sprayed concrete can supersede mesh sprayed concreter in tunnel supporting from the tensile strength.
This thesis is focused on the research the compressive strength, splitting tensile strength, the dynamic impact property of the plain concrete and the steel-fiber concrete using the Hydraulic pressure servo universal testing machines and the Split-Hopkins on pressure bar(SHPB) test. The feasibility using steel-fiber concrete as a substitute for plain concrete in tunnel support was studied. Compared test of steel-fiber concrete under static, dynamic and static-and-dynamical combination load were carried out. Some conclusions have been draw during the analysis. The compressive strength, splitting tensile strength of Steel fiber reinforced concrete surpass the concrete and steel fiber reinforced concrete have excellent impact resistance. It is a fine tunnel supporting material and the optimal influence of fiber volume ratio fitting is 1 %.
It proves that steel-fiber reinforced sprayed concrete can supersede mesh sprayed concrete in tunnel supporting based on the test and we carry on the industry test in MaLuPing Mine Company of Kailin Group +700 level ground tunnel. The industrial test results indicated that the applied support scheme was better, not only steel-fiber concrete could control the surrounding rock's deformation, but also it could reduce working procedure and advance work efficiency greatly.
引文
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