聚丙烯纤维高水材料力学性能的试验研究

Experimental Study on Mechanical Properties of Polypropylene Fiber High-water Material

在充填开采中,高水材料作为一种新型的充填材料,近年来得到广泛应用。但纯高水材料充填体在受压后往往裂隙较多,导致其受压后的强度不高,强度保持不稳定。利用聚丙烯纤维对高水材料进行掺杂,借助ETM力学试验系统,对掺杂聚丙烯纤维后的高水材料的破坏过程、压缩强度和变形特性等进行测试研究。结果表明:聚丙烯纤维的长度和掺量对高水材料试样的强度均有影响;聚丙烯纤维几乎不会改变高水材料的破坏形式和应力—应变曲线的形状,掺杂试样依然是"X"型剪切—劈裂破坏;纤维的掺入使得试样的峰后力学性能表现增强,掺杂纤维试样的残余强度占峰值强度的65%~84%;聚丙烯纤维的阻裂效应使得高水材料具有更好的完整性和连续性,聚丙烯纤维对高水材料有补强效应,适合作为采空区高水材料充填体的补充材料。

As a new type of filling material, high-water material has been widely used in backfill mining in recent years. However, the filling material of pure high-water material often occur many crack after compression, resulting in low strength and unstable performance. Polypropylene fiber was used to mix with high-water material. The failure process, compressive strength and deformation characteristics of high-water material doped with polypropylene fiber were tested by ETM mechanical test sys- tem. The results showed that the length and content of polypropylene fiber have influence on the strength of high-water material sample. Polypropylene fiber hardly any change the failure form of high-water material and the shape of stress-strain curve, and the destructional forms of the mixed sample is still ＂X＂ type shear and splitting failure. The mechanical properties of the high- water material were enhanced by the addition of polypropylene fiber, and the residual strength of the doped fiber sample was 65% - 84% of the peak strength. The crack resistance effect of polypropylene fiber makes the high-water material have better integrity and continuity, polypropylene fiber has strong reinforcing effect on high-water material, and it is suitable for supple- ment of high-water material filling body in goal.