管桩施工过程中匀质地层土体应力分析

doi:10.3724/1000-6915.jrme.2023.1046

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摘要根据岩土工程中预应力管桩施工过程中静压施工技术，对轴对称约束下的预应力管桩静压入土现象进行分析，对桩周土体的应力状态给出解答。(1) 首先提出了RMNLD强度准则，该准则可有效的应用于黏土、砂土以及岩石等岩土材料的破坏以及屈服特性描述，并基于所提准则提出了使用二维应力量p，q本构模型的转换应力方法。(2) 桩周土体可视为弹塑性材料，采用UH模型可以有效描述土体的硬化软化过程。为增加岩土种类的破坏描述能力，利用基于RMNLD准则的变换应力方法对UH模型实现应力的一般化，并推导得到相应的三维土体的本构方程。(3) 提出一种简化描述管桩静压入土过程中的分析方法，利用距径比的指数函数作为描述径向距离上的径向位移。并利用桩周土体的受力及变形的自相似性质，利用状态参量建立距径比与径向应变、体应变等的关系，利用上述一定距径比下的应变值作为边界条件来联立本构方程，可求解得到对应的土体应力。通过已有测试成果以及利用数值试验结果与预测对比，确认了所提方法的正确性与适用性。

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	万征
	刘媛媛
	曹伟
	易海洋

关键词 ：土力学, 预应力管桩, 轴对称, 弹塑性材料, 强度准则, 本构方程

Abstract：According to the construction technology process of pre-stressed pipe piles in geotechnical engineering，the phenomenon of static compression of pre-stressed pipe piles with axisymmetric constraints is analyzed，and the stress state of the surrounding soil is proposed. (1) First，the RMNLD strength criterion is introduced，which effectively describes the failure and yield characteristics of clay，sand，rock，and other geotechnical materials. Based on this criterion，a transformation stress method for a two-dimensional stress model with parameters p and q is proposed. (2) The soil around the pile is regarded as elastic-plastic material，and the hardening and softening processes of the soil are effectively described using the UH model. To enhance the failure description capability for various rock and soil types，the stress generalization of the UH model is achieved through the transformed stress method based on the RMNLD criterion，leading to the derivation of the corresponding three-dimensional soil constitutive equation. (3) A simplified analysis method is proposed to describe the static compression process of pipe piles，utilizing an exponential function of the distance-to-diameter ratio to represent radial displacement at a given radial distance. Leveraging the self-similar properties of the forces and deformations of the soil surrounding the pile，the relationship between the distance-to-diameter ratio and radial strain，volume strain，etc.，is established using the state parameter . The corresponding soil stress can then be determined using the aforementioned strain values as boundary conditions. The validity and applicability of the proposed method are confirmed through comparisons with predictions，test results，and numerical simulations.

Key words： soil mechanics prestressed pipe pile axisymmetric elastoplastic material strength criterion constitutive equation

引用本文:

万征，刘媛媛，曹伟，易海洋. 管桩施工过程中匀质地层土体应力分析[J]. 岩石力学与工程学报, 2025, 44(S1): 183-195.
WAN Zheng，LIU Yuanyuan，CAO Wei，YI Haiyang. Analysis of soil stress in uniform layer during construction of pipe pile. , 2025, 44(S1): 183-195.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2023.1046 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/183

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