新型混凝土防护边坡大型振动台试验
A Large-Scale Shaking Table Test of Slopes Protected by New-Type Concrete
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为解决传统喷射混凝土刚性大、延性差、易在地震动中开裂失效的问题,研发新型柔性混凝土材料.基于一种掺入聚丙烯纤维与膨润土的新型柔性喷射混凝土,以鲁甸红石岩滑坡为原型,开展新型混凝土(NC)与普通混凝土(OC)防护边坡的对比振动台试验,分析其动力响应与损伤演化机制.在地震动加载下,NC防护边坡自振频率变化较小,较OC边坡更为平稳.Hilbert-Huang分析表明,NC防护边坡的能量响应在地震波主频处呈现显著分布,而OC防护边坡能量则集中于自振频率附近.边际谱能量进一步揭示,NC边坡损伤起始时间延迟,能量耗散过程更为平稳,结构完整性在强震作用下保持更优.新型混凝土通过增强界面协调与耗能能力,显著提升边坡抗震性能,为地震区浅层滑坡防治提供延性更强、耐损性更好的技术途径.
To solve the problems of traditional shotcrete, such as high rigidity, poor ductility, and easy cracking and failure during seismic activities, a new type of flexible concrete material was developed. Based on a new type of flexible shotcrete mixed with polypropylene fibers and bentonite and taking the Ludian Hongshiyan landslide as a prototype, a comparative shaking table test of slopes protected by new - type concrete (NC) and ordinary concrete (OC) was carried out. The dynamic response and damage evolution mechanism were analyzed. Under seismic loading, the natural vibration frequency of the slope protected by NC changed less and was more stable than that of the slope protected by OC. Hilbert-Huang analysis shows that the energy response of the slope protected by NC was significantly distributed at the main frequency of the seismic wave. In contrast, the energy of the slope protected by OC was concentrated nearly at the natural vibration frequency. The marginal spectrum energy further revealed that the damage initiation time of the NC slope was delayed, the energy dissipation process was more stable, and the structural integrity was better maintained under strong earthquakes. The new -type concrete significantly improves the seismic performance of slopes by enhancing the interface coordination and energy-dissipation capacity. It provides a technical approach with stronger ductility and better damage resistance for the prevention and control of shallow landslides in seismic areas.
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河南省重点研发专项(241111322900)
国家自然科学基金项目(42090052)
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