• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tunnelling and underground space technology >Shaking table tests on seismic behavior of polypropylene fiber reinforced concrete tunnel lining
【24h】

Shaking table tests on seismic behavior of polypropylene fiber reinforced concrete tunnel lining

机译：聚丙烯纤维混凝土隧道衬砌抗震性能的振动台试验

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fiber reinforced concrete has been a widely applied durable material in ground structures or as the primary support in underground structures in the form of shotcrete. Whereas, fiber reinforced concrete was seldom utilized as secondary lining in underground structures, much less the polypropylene fiber reinforced concrete. Currently, many researches about fiber reinforced concrete have attempted to study tunnel linings behavior mostly in static state but fiber reinforced concrete has more advantages in seismic dynamic circumstance. A shaking table-based method to determine the behavior of polypropylene fiber reinforced concrete as tunnel lining can be the ideal method to study its response mechanism in seismic dynamic states. This paper presents results from a series shaking table tests on scaled tunnel models with the plain concrete (PC), steel reinforced concrete (RC) and polypropylene fiber reinforced concrete (PFRC) under increasing seismic intensities excitations. This research aims to explore the polypropylene fiber reinforced concrete as secondary lining reducing the seismic response intensity of tunnel structure. The comparison demonstrates that low tensile strength and brittle behavior at low strain are the two significant shortcomings of plain concrete. Concrete destruction, mortar destruction and cement pastes destruction are the three levels can describe the damage process of plain concrete. The three main roles of polypropylene fiber in concrete lie in polypropylene fiber strength, toughness and resistance to split. Polypropylene fiber changes the brittle behavior of PC and the damage patterns of RC along with the distribute paths of cracks. Besides, polypropylene fiber is able to effectively minimize the amount of initial micro cracks, postpone the appearance of new cracks, prevent the propagation of macro cracks and relieve the stress concentration at the ends of fibers. Polypropylene fiber allows tunnel lining to generate smaller deformations and strains to resist deformations of surrounding rock, which is more suitable to be applied in the large deformation sections of tunnel lining in soft surrounding rock. It is important to choose the suitable lining materials in terms of seismic intensity to take full advantage of the aseismic performance. The above research results can provide reference for polypropylene fiber reinforced concrete design and further research as tunnel lining.
机译：纤维增强混凝土已成为广泛应用的耐久材料，在地面结构中或作为喷射混凝土形式在地下结构中的主要支撑。而在地下结构中很少使用纤维增强混凝土作为次要衬砌，更不用说聚丙烯纤维增强混凝土了。目前，有关纤维混凝土的许多研究都试图研究隧道衬砌在静态下的行为，但是纤维混凝土在地震动态情况下具有更多的优势。基于振动台的方法确定聚丙烯纤维混凝土作为隧道衬砌的性能可能是研究其在地震动态状态下响应机理的理想方法。本文介绍了在不断增加的地震烈度激励下，用普通混凝土（PC），钢筋混凝土（RC）和聚丙烯纤维增强混凝土（PFRC）在比例尺隧道模型上进行的一系列振动台试验的结果。本研究的目的是探索以聚丙烯纤维混凝土为次要衬砌，以降低隧道结构的地震响应强度。比较表明，低抗拉强度和低应变下的脆性是普通混凝土的两个主要缺点。混凝土的破坏，砂浆的破坏和水泥浆的破坏都是可以描述普通混凝土破坏过程的三个层次。聚丙烯纤维在混凝土中的三个主要作用是聚丙烯纤维的强度，韧性和抗裂性。聚丙烯纤维会改变PC的脆性和RC的破坏方式以及裂纹的分布路径。此外，聚丙烯纤维能够有效地减少初始微裂纹的数量，推迟新裂纹的出现，防止宏观裂纹的传播，并减轻纤维末端的应力集中。聚丙烯纤维可使隧道衬砌产生较小的变形和应变，以抵抗围岩的变形，这更适合用于软质围岩中隧道衬砌的大变形区域。重要的是要根据地震强度选择合适的衬砌材料，以充分利用抗震性能。以上研究结果可为聚丙烯纤维混凝土的设计和隧道衬砌的进一步研究提供参考。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号