钢纤维形状对混凝土力学性能的影响及湿喷支护应用研究
Effect of Steel Fiber Shape on Mechanical Properties of Concrete and Application of Wet Spray Support
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摘要: 详细研究不同形状和掺量钢纤维对混凝土的增强性能,以更好地应用于巷道湿喷支护,选取了平直型、波浪型和凹凸型钢纤维,通过试验分别研究了3种形状钢纤维在掺量为0、20、40、60、80、100 kg/m3时混凝土的抗拉和抗弯强度。将最佳形状和掺量的钢纤维应用于巷道湿喷支护,通过现场观测分析了钢纤维混凝土湿喷支护效果。结果显示:不同形状钢纤维增强混凝土抗拉强度和抗弯强度的排序为:凹凸型>波浪型>平直型;钢纤维增强混凝土抗拉强度和抗弯强度的最佳钢纤维掺量为60 kg/m3;钢纤维混凝土湿喷支护能够有效控制巷道围岩,比普通混凝土的喷浆支护效果好。Abstract: In order to study the reinforcing effect of different shapes and amounts of steel fiber on concrete and better apply to roadway wet spray support, straight, wavy and concave-convex steel fibers were selected. The tensile and flexural strength of concrete with three kinds of shape steel fibers at 0, 20, 40, 60, 80, 100 kg/m3 were studied by experiments. The best shape and the amount of steel fiber are applied to the roadway wet spray support. The effect of wet-spray support of steel fiber reinforced concrete was analyzed through on-site observation. The results show that the order of tensile strength and flexural strength of steel fiber reinforced concrete with different shapes is: concave and convex> wave type> straight type. The optimum steel fiber content for tensile strength and flexural strength of steel fiber reinforced concrete is 60 kg/m3. The steel fiber concrete wet-spray support can effectively control the surrounding rock of the roadway, which is better than the general-purpose concrete spray- supporting effect.
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