Analysis of seismic damage mechanism of travertine at Nuorilang waterfall, Jiuzhaigou
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摘要: 2017年8月8日九寨沟发生7.0级地震，景区内部分景观破损，其中诺日朗瀑布钙华体局部出现小规模坍塌。通过调查研究，查明了瀑布景观钙华的震损现状，结合二维离散元分析软件Universal Distinct Element Code (UDEC)对变形破坏过程进行了模拟分析，揭示了钙华震损过程分为振动蠕变、持续拉张、倾倒折断和溃屈破坏4个阶段。综合地质环境背景分析，景观钙华形成的地质环境条件和景区水流系统处于基本稳定状态，景观体处于相对稳定的发展阶段，层湖叠瀑景观不会消亡。Abstract: The Jiuzhaigou earthquake that occurred on August 8, 2017, has caused damage to some landscapes in the scenic area, including a small-scale collapse of the travertine located in the famous Nuorilang waterfall. Based on investigation, the current situation of seismic damage to the travertine has been determined. Besides, the damage process of the travertine has been simulated and analyzed through the two-dimensional discrete element analysis method (Universal Distinct Element Code, UDEC). The process reveals that the travertine has experienced four stages: vibration creep, continuous tension, toppling fracture and buckling failure. According to the analysis of seismic damage process of the travertine and its geological environment background, the geological environment conditions for the formation of travertine and the water flow system in the scenic area are basically stable, so the travertine will be in a relatively stable development stage, and the famous waterfall landscape will not die out.
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