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谢新宇, 龚涛, 许纯泰, 王忠瑾, 娄扬, 刘开富, 张日红. 考虑桩土间黏滑机制的桩基沉降动态特性研究[J]. 岩土工程学报, 2024, 46(2): 264-272. DOI: 10.11779/CJGE20221316
引用本文: 谢新宇, 龚涛, 许纯泰, 王忠瑾, 娄扬, 刘开富, 张日红. 考虑桩土间黏滑机制的桩基沉降动态特性研究[J]. 岩土工程学报, 2024, 46(2): 264-272. DOI: 10.11779/CJGE20221316
XIE Xinyu, GONG Tao, XU Chuntai, WANG Zhongjin, LOU Yang, LIU Kaifu, ZHANG Rihong. Dynamic settlement characteristics of piles based on stick-slip mechanism between piles and soils[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 264-272. DOI: 10.11779/CJGE20221316
Citation: XIE Xinyu, GONG Tao, XU Chuntai, WANG Zhongjin, LOU Yang, LIU Kaifu, ZHANG Rihong. Dynamic settlement characteristics of piles based on stick-slip mechanism between piles and soils[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 264-272. DOI: 10.11779/CJGE20221316

考虑桩土间黏滑机制的桩基沉降动态特性研究

Dynamic settlement characteristics of piles based on stick-slip mechanism between piles and soils

  • 摘要: 基于桩基运动控制方程,对荷载作用下的桩基沉降动态特性进行了研究。首先,考虑桩土间黏滞与滑动两种接触状态,建立了一种考虑侧阻软化及侧阻恢复的桩土相互作用模型;然后采用该模型及修正三折线模型分别模拟桩与桩侧土以及桩端土间的相互作用,结合有限差分法建立了考虑桩土间黏滑机制的桩基沉降分析方法;最后,基于建立的桩基受荷沉降分析方法,研究了桩基沉降的黏滑动态特性以及桩身的力学特性,并讨论了桩土相互作用模型中的参数对桩基沉降动态特性的影响。结果表明:当桩顶荷载接近桩基单级加载极限值,桩基沉降表现出黏滞位移与快速滑动位移交替的动态特性;桩身力学响应表现出加载路径相关性,与单级加载相比,分级加载时桩侧摩阻力能得到更好发挥,桩基极限承载力更高;提出的分析方法能够较好地模拟桩基静载试验沉降过程。

     

    Abstract: The dynamic characteristics of the pile settlement under loads are studied based on the motion control equation for piles. Firstly, a pile-soil interaction model, considering the softening and recovery of resistance, is established by considering two contact states between piles and soils: sticking and slipping. Then, the established model and a modified tri-linear model are used to simulate the pile-side soil interaction and pile-tip soil interaction, respectively. A method for settlement of pile foundation considering the stick-slip mechanism between piles and soils is established in combination with the finite difference method. Finally, the stick-slip dynamic characteristics of the pile settlement and the mechanical characteristics of the pile are investigated based on the analysis method. The effects of the parameters of pile-soil interaction model on the dynamic characteristics of pile settlement are also analyzed. The results show that the dynamic characteristics of pile foundation with alternating sticking movement and rapid slipping movement are observed when the loads are close to the ultimate value of single-stage loading. The mechanical responses of piles are related to the loading path. Compared with those under single-stage loading, the shaft resistance of the pile can be better mobilized and the ultimate bearing capacity of the pile is higher under gradation loading. The proposed method can be used to simulate the settlement process of static loading tests on the piles.

     

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