Dynamic Response Characteristics of Foundation of Mined-out Areas under High-speed Railway Load

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Acta Montanistica Slovaca Pub Date : 2024-07-15 DOI:10.46544/ams.v29i1.03

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Abstract

To reveal the dynamic response characteristics of the foundation of mined-out areas (MOA) under the high-speed railway (HSR) load is important for predicting settlement and safety assessment of the foundation. Taking MOA of Dianshang under the Taiyuan-Jiaozuo HSR as the engineering background, the model experiments and numerical analysis were employed to reveal the dynamic response of both subgrade and the foundation of the HSR, as well as the attenuation law of the acceleration in the overlying strata of the MOA. Results show that within the full frequency range of the HSR load, the dynamic response of the foundation increases with the increase in load frequency. When the depth exceeds 6 m, the dynamic response of the foundation initially increases and subsequently decreases with the increase in load frequency. Contrasted with single-point loading, the superposition effect and moving effect of the HSR load will form a dynamic response superposition zone within 1-4 m below the subgrade, leading to a significant enhancement of the dynamic response of the foundation. Compared to HSR axle load, the driving speed of HSR has a greater impact on the acceleration of both the subgrade and foundation. The obtained conclusions provide a reference for the safety operation of the HSR crossing the MOA

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高速铁路荷载下采空区地基的动态响应特性

揭示高铁荷载作用下雷区地基（MOA）的动力响应特性，对于地基沉降预测和安全评估具有重要意义。以太原至焦作高铁淀上矿区为工程背景，通过模型试验和数值分析，揭示了高铁路基和地基的动力响应特性，以及矿区上覆地层加速度的衰减规律。结果表明，在高铁荷载的全频率范围内，地基的动力响应随着荷载频率的增加而增加。当深度超过 6 米时，地基的动力响应开始增加，随后随着荷载频率的增加而减小。与单点荷载相比，高铁荷载的叠加效应和移动效应会在基底以下 1-4 m 范围内形成一个动力响应叠加区，导致地基动力响应显著增强。与高铁轴载相比，高铁行驶速度对路基和地基加速度的影响更大。所得出的结论为穿越 MOA 的高铁的安全运行提供了参考

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来源期刊

Acta Montanistica Slovaca 地学-地球科学综合

CiteScore

3.60

自引率

12.50%

发文量

审稿时长

30 weeks

期刊介绍： Acta Montanistica Slovaca publishes high quality articles on basic and applied research in the following fields: geology and geological survey; mining; Earth resources; underground engineering and geotechnics; mining mechanization, mining transport, deep hole drilling; ecotechnology and mineralurgy; process control, automation and applied informatics in raw materials extraction, utilization and processing; other similar fields. Acta Montanistica Slovaca is the only scientific journal of this kind in Central, Eastern and South Eastern Europe. The submitted manuscripts should contribute significantly to the international literature, even if the focus can be regional. Manuscripts should cite the extant and relevant international literature, should clearly state what the wider contribution is (e.g. a novel discovery, application of a new technique or methodology, application of an existing methodology to a new problem), and should discuss the importance of the work in the international context.