Experimental research on the mechanical properties of alkali-resistant glass fiber concrete acting as tunnel seismic isolation layer under periodic cyclic dynamic loading

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Cong Zhang , Qingbiao Wang , Yonggang Zhang , Shanyong Wang , Xinru Zhang , Yunxiao Wang
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引用次数: 0

Abstract

The installation of seismic isolation layer is an effective measure to ensure the safe operation of underground projects such as tunnels during extreme seismic activities. Material parameters, mechanical properties, and design patterns of the seismic isolation layer are key research topics in exploring effective reduction of seismic response. This study mainly focused on the dynamic performance of the seismic isolation layer in tunnels. A series of drop hammer impact tests and laboratory shaking table tests were performed to reveal the seismic features of the seismic isolation layer under periodic external loading. The test results indicated that all cracks in the specimen initiated from the center and dispersed outwards under the cycle impact of the drop hammer. The incorporation of alkali-resistant glass fibers in concrete (AR-GFRC) effectively provided "reinforcement " and "crack resistance" under cyclic loading of the drop hammer, and the minimum number and width of cracks were observed at a 0.75 % HD fiber content and a 0.5 % HP fiber content. In the x- and y-axis directions, the seismic isolation layer effectively mitigated peak acceleration, strain response, and displacement at the tunnel vault and invert, but significant nonlinearity was identified. When the thickness of seismic isolation layer was 10 mm, the peak seismic response of the lining were minimum at a 0.75 % HD fiber content and a 0.5 % HP fiber content. However, the thickness of the lining was not directly related to the destruction of the lining. The tunnel mainly experienced shear deformation in the x-axis direction, with significant deformations from the left arch waist to the right arch foot (45°-225°), resulting in transverse cracking. The tunnel primarily underwent tensile and compressive deformation in the y-axis direction, with significant deformations occurring in the inverted vault (0°-180°), resulting in tension and circumferential cracks. This research can provide valuable data support and reference for the design and construction of underground projects such as tunnels.

作为隧道隔震层的耐碱玻璃纤维混凝土在周期性循环动力荷载作用下的力学性能试验研究
设置隔震层是确保隧道等地下工程在极端地震活动中安全运行的有效措施。隔震层的材料参数、力学性能和设计模式是探索有效降低地震反应的关键研究课题。本研究主要关注隧道隔震层的动态性能。通过一系列落锤冲击试验和实验室振动台试验,揭示了隔震层在周期性外荷载作用下的抗震特性。试验结果表明,在落锤的周期性冲击下,试样中的所有裂缝都是从中心开始并向外扩散的。在混凝土中加入耐碱玻璃纤维(AR-GFRC)可在落锤的周期性荷载作用下有效地起到 "加固 "和 "抗裂 "的作用,在 HD 纤维含量为 0.75 % 和 HP 纤维含量为 0.5 % 时,裂缝的数量和宽度都最小。在 x 轴和 y 轴方向上,隔震层有效地减缓了隧道拱顶和反面的峰值加速度、应变响应和位移,但也发现了明显的非线性。当隔震层厚度为 10 毫米时,衬砌的地震峰值响应在高清纤维含量为 0.75% 和高密度纤维含量为 0.5% 时最小。然而,衬砌厚度与衬砌的破坏并无直接关系。隧道主要在 x 轴方向发生了剪切变形,从左拱腰到右拱脚(45°-225°)发生了显著变形,导致横向开裂。隧道主要在 y 轴方向上发生了拉伸和压缩变形,在倒拱顶(0°-180°)处发生了显著变形,从而产生了拉伸裂缝和周向裂缝。这项研究可为隧道等地下工程的设计和施工提供宝贵的数据支持和参考。
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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