高速列车荷载作用下X形桩桩网复合地基累积沉降研究

doi:10.13722/j.cnki.jrme.2023.0372

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摘要为了研究高速列车荷载作用下桩网复合地基累积沉降的发展规律，建立大比例尺X形桩桩网复合地基模型，开展一系列模型试验，探索X形桩桩网复合地基累积沉降的发展规律。结果表明：在循环振动20 000次之后，相邻四桩中心处累积沉降最大，轨道板上沉降次之，桩顶沉降最小；相邻四桩之间“网兜效应”显著。随着循环加载次数的增加，各测点处累积沉降均在不断增大；当加载频率≤15 Hz时，在循环振动10 000次后，各测点处累积沉降曲线逐渐变得平缓，沉降速率逐渐变小；当加载频率≥25 Hz时，随循环加载次数的增加，轨道板上累积沉降曲线几乎没有变缓的趋势，且累积沉降增长的速率较快。随着加载频率的增大，各测点处累积沉降逐渐变大，25 Hz时累积沉降出现极大值，有“类共振”现象发生。实际工程中，可通过增大路堤刚度，避免这类情况发生。随着加载幅值的增大，累积沉降线性单调增长；加载幅值每增加1 kN，轨道板上累积沉降平均增长1.27倍。最后通过分析对比提出了考虑列车速度、列车轴重等因素的累积沉降预测公式。

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	牛婷婷1
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	吴富敏1
	张智超4
	陈志雄2
	丁选明2

关键词 ：基础工程, 累积沉降, 桩网复合地基, 高速列车荷载, 沉降预测

Abstract：To explore the accumulated settlement of piled embankments under high-speed train loads，a large-scale X-shaped piled embankment model was established. A series of model tests were conducted，and the evolution of the cumulative settlement of X-shaped piled embankments was investigated. The results show that after 20 000 cycles of vibration，the accumulated settlement at the center of the adjacent four piles is the largest，followed by the track slab and then the pile top. Moreover，the “hang-up” effect in the square grid is significant. As the number of cyclic loading increases，the accumulated settlement at each measuring point continues to increase. When the loading frequency is ≤15 Hz，after 10 000 cycles of vibration，the accumulated settlement curves at each measuring point gradually become gentle，and the rate of settlement gradually decreases. Furthermore，when the loading frequency is ≥25 Hz，the accumulated settlement curves on the track slab show little tendency to slow down with increasing cyclic loading times，and the rate of accumulated settlement growth is relatively fast. With an increasing loading frequency，the accumulated settlement at each measuring point gradually increases. The accumulated settlement reaches a maximum value at 25 Hz，and a “quasi-resonance” phenomenon occurs. In practical engineering，such situations can be avoided by increasing the stiffness of the embankment. As the loading amplitude increases，the accumulated settlement linearly monotonically increases. When the loading amplitude increases by 1 kN，the accumulated settlement on the track slab increases by an average 1.27 times. Finally，a prediction formula for accumulated settlement evolution considering factors such as the train speed and axle load was proposed through analysis and comparison.

Key words： pile foundations accumulated settlement piled embankment high-speed train load settlement prediction

引用本文:

牛婷婷1，2，3，吴富敏1，张智超4，陈志雄2，丁选明2. 高速列车荷载作用下X形桩桩网复合地基累积沉降研究[J]. 岩石力学与工程学报, 2024, 43(1): 236-247.
NIU Tingting1，2，3，WU Fumin1，ZHANG Zhichao4，CHEN Zhixiong2，DING Xuanming2. Accumulated settlement of X-shaped piled embankments under high-speed train loads. , 2024, 43(1): 236-247.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0372 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I1/236

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