列车荷载下螺杆桩复合地基动力特性及承载性状试验研究

doi:10.13722/j.cnki.jrme.2022.0475

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摘要通过进行模拟列车荷载下铁路螺杆桩复合地基的室内模型试验，测试在列车多运作模式下桩–土系统的动应变、动土压力、累积位移特征；分析螺杆桩–土系统在列车荷载下的动力响应时频域特性，并进一步探讨在不同时速条件下的桩–土受力变形程度的相关性。基于线性拟合方法建立桩土动应力比与列车运行时速的经验关系。结合桩–土荷载分担关系、桩体动轴力及桩侧动摩阻力的综合考虑，揭示列车动荷载下螺杆桩–土的相互作用关系及荷载传递机制。结果表明：(1) 在列车动载作用下，螺杆桩螺纹段变形程度大于直杆段，尤其在变截面处易产生变形破坏。(2) 在普速、快速、高速行驶条件下优势频率分别集中在2～6，8～11，14～16 Hz，随着列车时速的增大，主导频率趋近于列车自振频率，频带宽度减小。(3) 螺杆桩复合地基的动力特性与列车运行时速存在高度相关性。(4) 螺杆桩复合地基加固作用下，铁路地基临界速度在280 km/h左右，相对普通桩加固地基提高了29.62%。(5) 列车运行时速越快，在桩土复合地基中土体承载发挥作用变大，而桩体承载发挥作用减小，造成桩土协同作用性能降低。研究成果对铁路螺杆桩复合地基的设计优化及列车运营时速的规划具有一定参考意义。

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	关伟1
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	吴红刚1
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	余仕江3
	吴术高3
	朱兆荣2

关键词 ：桩基础, 列车荷载, 螺杆桩复合地基, 动力响应, 临界速度, 桩土相互作用

Abstract：The characteristics of dynamic strain，earth pressure and cumulative displacement of pile-soil system under multi-train operation mode were tested by laboratory model test of railway screw pile composite foundation under simulated train loads. The time-frequency characteristics of dynamic response of the screw pile-soil system under train load were analyzed，and the correlation of pile-soil deformation under different speeds was further discussed. Based on the linear fitting method，the empirical relationship between the pile-soil dynamic stress ratio and the train speed was established. Combined with the pile-soil load sharing relationship，the pile dynamic axial force and the pile side dynamic friction，the interaction relationship and loads transfer mechanism of screw pile-soil under train dynamic loads are revealed. The results show that：(1) under the train dynamic load，the deformation degree of a screw pile is greater than that of straight rod，especially at variable section. (2) Under the conditions of general speed，fast speed and high speed，the dominant frequencies are concentrated in 2–6 Hz，8–11 Hz and 14–16 Hz respectively. With the increase of train speed，the dominant frequency tends to the natural vibration frequency of the train，and the frequency band width decreases. (3) The dynamic characteristics of screw pile composite foundation are highly correlated with the speed of train operation. (4) Under the reinforcement of screw pile composite foundation，the critical velocity of railway foundation is about 280 km/h，which is 29.62% higher than that of ordinary pile foundation. (5) The faster the train speed is，the greater the effect of soil load on pile-soil composite foundation，while the less the effect of pile load on pile-soil composite foundation，resulting in the decrease of pile-soil synergistic effect. The research results have certain reference significance for the design optimization of railway screw pile composite foundation and the planning of train operation speed.

Key words： pile foundation train load part-screw pile composite foundation dynamic response critical velocity pile-soil interaction

引用本文:

关伟1，2，吴红刚1，2，余仕江3，吴术高3，朱兆荣2. 列车荷载下螺杆桩复合地基动力特性及承载性状试验研究[J]. 岩石力学与工程学报, 2023, 42(2): 508-520.
GUAN Wei1，2，WU Honggang1，2，YU Shijiang3，WU Shugao3，ZHU Zhaorong2. Experimental study on dynamic and bearing characteristics of part-screw pile composite foundations under train loads. , 2023, 42(2): 508-520.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0475 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I2/508

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