列车动载激励下长短桩复合地基振动能量传递特性及易损性评估

doi:10.13722/j.cnki.jrme.2022.1133

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摘要为了深入研究一种螺杆桩+水泥土挤密桩新型长短桩复合地基在长期列车荷载作用下的动力特性与变形特征，开展长短桩复合地基室内动力模型试验，分析振动响应信号的时频域特征、子频带能量分布以及能量衰减规律，揭示长短桩复合地基振动能量的空间传递特征。基于小波包能量分析的方法，建立一种复合地基易损性判别指标?ERMS，并通过桩体动应变响应及桩间土体位移响应对?ERMS指标的易损性识别效果进行评价。结果表明：(1) 螺杆桩+水泥土挤密桩长短桩复合地基振动信号的频率主要分布在0～25 Hz范围，引起峰值振动响应的特征频率主要集中在列车自振频率附近。(2) 振动波沿桩间土体介质传播过程中一部分高频被过滤掉，低频部分继续传播，在距离地基表层较远处振动能量主要集中在低频。(3) 桩体及桩间土体振动能量在地基浅层衰减速率较快，但随着地基深度增加，振动能量衰减速率逐渐变缓。(4) ?ERMS指标值对桩体的易损性具有良好的判识效果，长桩及短桩中间部位易损性程度最大，属抗振薄弱部位；(5) 桩间土体位移随振次增大呈现渐进式增长的趋势。?ERMS指标值无法对土体的损伤变形程度进行有效的判别。研究成果对于长短桩复合地基在列车荷载下的工程设计具有一定参考意义。

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	关伟1
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	吴红刚1
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	刘旭3
	马至刚4
	冯康4

关键词 ：桩基础, 长短桩复合地基, 小波包变换, 振动能量传递, 易损性

Abstract：In order to further study the dynamic characteristics and deformation characteristics of a new type of long-short pile composite foundation with part-screw pile + cement soil compaction pile under long-term train load，the indoor dynamic model test of long-short pile composite foundation was carried out. The time-frequency domain characteristics，sub-band energy distribution and energy attenuation law of vibration response signal were analyzed，and the spatial transmission characteristics of vibration energy of long-short pile composite foundation were revealed. Based on the method of wavelet packet energy analysis，a vulnerability evaluation index ?ERMS was established，and the identification effect of ?ERMS index was verified by the dynamic strain response of piles and the displacement response of the soil between piles. The results show that：(1) The frequency of the vibration signal of the composite foundation of part-screw pile + cement soil compaction pile is mainly distributed in the range of 0–25 Hz，and the characteristic frequency causing the peak vibration response is mainly concentrated near the natural frequency of the train. (2) During the propagation of the vibration wave along the soil medium between the piles，part of the high frequencies are filtered out and the low frequency part continues to propagate，at a distance from the surface of the foundation the vibration energy is mainly concentrated in the low frequencies. (3) The vibration energy of the pile and the soil between the piles decays faster at the shallow level of the foundation but slows down as the depth of the foundation increases. (4) The ?ERMS index value has a good identification effect on the vulnerability of the pile. The vulnerability of the middle part of the long pile and the short pile is the largest，which belongs to the weak part of the vibration resistance. (5) The displacement of soil between piles increases gradually with the increase of vibration times. The value of ?ERMS index cannot effectively distinguish the damage and deformation degree of soil. The research results have certain reference significance for the engineering design of long-short pile composite foundation under train load.

Key words： pile foundation long-short pile composite foundation wavelet packet transform vibration energy transfer vulnerability

引用本文:

关伟1，2，吴红刚1，2，刘旭3，马至刚4，冯康4. 列车动载激励下长短桩复合地基振动能量传递特性及易损性评估[J]. 岩石力学与工程学报, 2024, 43(S1): 3543-3556.
GUAN Wei1，2，WU Honggang1，2，LIU Xu3，MA Zhigang4，FENG Kang4. Vibration energy transfer characteristics and vulnerability evaluation of long- short pile composite foundation under train dynamic load excitation. , 2024, 43(S1): 3543-3556.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1133 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3543

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