软岩巷道聚丙烯混凝土钢筋网壳复合衬砌试验及工程应用研究

根据大跨度空间壳体力学原理,研究聚丙烯网壳锚喷支护新技术。其技术特色是用一种在地面加工成型的特殊三维钢筋支架代替普通的二维钢筋网,大幅度提高了锚网喷结构的支撑能力,不需要使用型钢支架、锚索、围岩注浆等手段进行加固就能有效地支护高地压大变形巷道、跨采动压巷道、冲击地压巷道以及大断面硐室等。依托西山煤电集团大巷破碎段修复工程,完成了聚丙烯纤维混凝土钢筋网壳复合衬砌支护结构的室内模型试验,研究了复合衬砌的变形、破坏形态与发展规律。现场应用表明,在不降低支护的承载能力的情况下,与重型金属支架相比,该支护形式降低了钢材用量和混凝土回弹量,且具有良好的柔性,是软岩巷道一种优良的让压支护结构,具有较好的推广应用前景。

Test and application of polypropylene concrete bar shell bolting shotcrete support system in soft rock drift

The polypropylene bar shell bolting shotcrete and support system was studied on the basis of the analysis of the mechanics principle of shell structures. The technique feature is a kind of specially three-dimensional bar-mat reinforcement instead of three-dimensional bar-mat. It has very high mechanical property and was applied in difficult drift without profiled bar, anchor bolt, grouting and so on. The model experiment was done by relying on the industrial test on the broken laneway of Xishan Coal Power Company. The distortion, destruct shape, developmental rule of the supporting system were examined while the stress and strain distributing rule and also the ultimate load were obtained. The application showed that without reducing the carrying capacity of supporting the case, and heavy metal stent compared to the steel supporting the form of reduced consumption and the amount of concrete rebound, and has good flexibility, is an excellent soft rock drift Jean pressure retaining structure, and has good prospects for widespread application.