用于深井巷道的纤维增韧水泥基复合材料研究

为满足深井巷道支护结构高强高韧要求,改善素混凝土支护喷层脆性大、韧性差的问题,提出了用改性聚丙烯(粗)纤维掺加到水泥中形成水泥基复合材料来替代素混凝土喷层.通过对不同掺量改性聚丙烯(粗)纤维混凝土力学性能的试验研究,得到了优化配合比,与素混凝土相比,这种纤维混凝土的抗折强度、延性、弯曲韧性分别提高了0.22,8.1,9.9倍.经过3a深井井下工业性试验,改性聚丙烯(粗)纤维混凝土试验段未出现开裂现象,而素混凝土在施工0.5a后就出现了局部开裂和脱落现象.试验表明:改性聚丙烯(粗)纤维混凝土具有高韧性特点,用于深井巷道支护安全、可靠.

Research on Fibers High Toughness Cement Based Composite Material Used in Deep Mine Support

In order to achieve high strength and toughness of roadway support in deep mine, a new kind of cement based composite material was proposed to replace plain concrete spray layer by a polypropylene(thick) fibers. The optimal proportion of the fiber and concrete was obtained based on the mechanical property tests about fiber concrete with different matchings in the laboratory. It indicates that the bending strength, ductility, ductility of material are 0.22 times, 8.1 times and 9.9 times of that of plain concrete respectively. There has been no cracking phenomena in the fiber reinforced concrete in industrial experiment within 3a, while the control saw local cracks and fell offs in 0.5a. The results show that the polypropylene(thick) fiber in cement based composite materials have the high toughness character which can be applied in roadway support for preventing from the deformation of wall rock safely and efficiently.