在不同土壤性质的道现场模型上对低沉逆断层脱位效应的实验分析
Jianyi Zhang1,2,3, Yijie Song4, Zhongheng Li5
1College of Geological Engineering, Institute of Disaster Prevention, Sanhe, 065201, China.
Scientific reports
|January 13, 2024
概括
穿越活跃断层的道结构需要更好的设计. 这项研究发现,细分的柔性关节在凝聚性土壤中更好,而沙性土壤在断层脱时会放大道应变和变形.
科学领域:
- 地质技术工程 地质技术工程
- 地震学 地震学
- 结构工程 结构工程
背景情况:
- 跨越活跃断层的道结构的故障机制和抗故障设计仍然不充分确立.
- 了解受到断层位移的道的地震反应对于基础设施安全至关重要.
研究的目的:
- 调查不同土壤类型 (凝聚性和沙性) 的道结构在低角度逆断层脱位期间的地震性能.
- 评估断层运动对道变形的影响,并确定有效的抗断层措施.
主要方法:
- 使用自主开发的大型基岩脱位装载装置平台进行模型测试.
- 模拟的低角度反断层脱位场景与沙子和凝聚性土壤地点的道结构.
- 分析了道段和周围土壤的地震损害和应变变化.
主要成果:
- 分段的柔性联合道段在断层分级过程中在凝聚性土壤地点表现出卓越的性能.
- 与凝聚性土壤场所相比,在沙性土壤场所的道经历了显著更高的应变 (顶~2倍,底~6倍).
- 沙土层呈现出增加的升起和不均的变形,破裂区迁移,表明道结构上"增加的地震"效应.
结论:
- 道接头设计的选择 (细分的柔性接头) 是关键的,并且取决于地点,有利于凝聚性土壤.
- 沙土场地在十字断层道中放大了地震引起的压力和变形,需要特别考虑设计.
- 准确地描述土壤超负荷中断裂区对于优化道埋藏深度,段长和在地震活跃区域实施有效的抗断裂措施至关重要.
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