TY -的A2 Heidarzadeh阿克巴盟——秦Bendong AU -李烁AU -郭,嘉盟——刘Shaofeng盟——刘,西凉兵马,非盟-赖,永标AU -李,海亮PY - 2022 DA - 2022/04/25 TI -试验研究聚丙烯的力学性能:钢纤维混凝土和井筒支护的受力特点SP - 7013748六世- 2022 AB -浅层煤炭资源的快速消耗,井筒支护施工的深度继续增加;巨大的地层压力和复杂地质条件使井筒支护的应力条件变得更加复杂。混凝土强度等级通常是提高井筒支护的承载能力;然而,高强度等级高脆性。为了解决这一问题的高脆性的高强混凝土井壁超深矿井建设、steel-polypropylene混合高性能纤维增强混凝土(SPHFRC)轴模型的开发。SPHFRC各种混合比例是由优化纤维含量。SPHFRC的力学性能进行了测试并与参考混凝土(PHSC)。结果表明,可获得SPHFRC通过添加钢纤维体积分数在1.2%和1.0%的聚丙烯纤维,从而增加27.5%的抗拉强度和抗压强度SPHFRC类似于具体的引用。通过引入一个新的脆性评价指标评估混凝土的脆性,结果表明纤维大大提高PHSC的脆性问题。之后,模型试验PHSC和SPHFRC井筒支护,圆周和轴向load-stress-strain曲线和混凝土和钢筋的荷载位移曲线进行了分析。 Combining the failure characteristics of the two shaft lining models, the following conclusions are obtained: The ultimate bearing capacity of PHSC shaft lining is hardly affected by fibers, but the hoop displacement is significantly reduced and the circumferential stability of shaft lining has been greatly improved, the initial cracks appeared late, the speed of crack’s propagation is reduced, and no obvious concrete peeling and separation appeared during damage. The comprehensive performance of SPHFRC shaft lining is excellent, which has better ductility and anti-deformation ability. SN - 1687-8434 UR - https://doi.org/10.1155/2022/7013748 DO - 10.1155/2022/7013748 JF - Advances in Materials Science and Engineering PB - Hindawi KW - ER -