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针对当前锚喷支护中混凝土易开裂、抗拉强度差,围岩变形大的现状,研制出了一种新型高分子材料聚丙烯纤维,它能够与混凝土均匀混合并在混凝土喷层中形成均匀的三维网状乱向支撑体系,产生一种二级加强效果,有效的阻止了混凝土收缩离析,沉降的形成和发展,极大地改善了围岩的结构和物理力学性能,提高了围岩的承载能力,增强了围岩抗变形能力。通过与普通混凝土衬砌数值模拟对比分析和工程应用监测发现,该聚丙烯纤维混凝土喷层能够很好的抵抗围岩的变形,保证了围岩的稳定性,提高了经济安全性。具有比普通混凝土喷层更有实际应用价值的优势,有着广泛的应用前景。
Aiming at the current situation that concrete is easy to crack, tensile strength is poor and deformation of surrounding rock is large, a new kind of polymer material polypropylene fiber is developed, which can be uniformly mixed with concrete and formed uniformly in the concrete spray layer Of the three-dimensional mesh disorderly support system, resulting in a two-stage strengthening effect, effectively prevent the concrete shrinkage segregation, the formation and development of settlement, which greatly improved the structure and physical and mechanical properties of surrounding rock and improve the bearing capacity of the surrounding rock Ability to enhance the deformation resistance of rock around. Through the comparison with ordinary concrete lining numerical simulation and engineering application monitoring, it is found that the polypropylene fiber concrete shotcrete layer can well resist the deformation of surrounding rock, ensure the stability of surrounding rock and improve the economic safety. Has more practical application value than ordinary spray layer advantage, has a wide range of applications.