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竖向荷载下软土中碎石单桩破坏模式及承载力计算
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Failure Mode and Calculation Method of Ultimate Bearing Capacity of a Single Stone Column in Soft Soil under Vertical Loading
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    摘要:

    采用有限差分法对软土地基中碎石桩单桩竖向受荷破坏全过程进行数值模拟研究. 引入考虑体积应变截断的塑性硬化模型模拟碎石桩体,能够较好地反映碎石桩体的非线性剪胀力学行为以及由此引起的桩土相互作用. 重点分析了桩体鼓胀变形、桩侧土压力演化以及由此决定的单桩破坏模式与典型荷载沉降曲线. 传统单桩极限承载力公式所假设的整体剪切破坏模式仅适用于刚度较大的土体,而在软土中局部剪切破坏模式更为常见. 为此,基于弹塑性介质中圆孔扩张理论推导了考虑桩体鼓胀变形及桩周土体刚度的碎石桩单桩承载力计算公式,并通过对比数值解验证了推导公式的有效性. 较为系统地研究了软土地基中碎石桩单桩的承载机理及破坏模式,可为进一步研究碎石桩复合地基承载机理打下坚实的基础.

    Abstract:

    The finite difference method is used to numerically simulate the complete bearing and failure process of a single stone column under vertical loading in soft soil. The plastic hardening constitutive model considering volumetric strain interception is used to simulate the stone column,which can well reflect the nonlinear dilatancy mechanical behavior of the stone column and the resulting column-soil interaction. The bulging deformation of the stone column,the evolution of soil stress acting on the stone column,the failure modes and the corresponding typical p-s curves are analyzed. The overall shear failure mode assumed by the traditional formula is only applicable to soils with high stiffness,while the local shear failure mode is more common in soft soils. Therefore,based on the theory of circular hole expansion in elastoplastic media,the calculation formula of ultimate bearing capacity of single stone column considering the column bulging deformation and the soil stiffness is derived. The formula is verified by the numerical simulation solution. The bearing mechanism and failure mode of the single stone column in soft soil are systematically studied,which provides a theoretical foundation for further study on the bearing mechanism of composite ground reinforced with stone columns.

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谭鑫?覮,冯龙健,胡政博,赵明华.竖向荷载下软土中碎石单桩破坏模式及承载力计算[J].湖南大学学报:自然科学版,2021,(9):10~19

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  • 在线发布日期: 2021-09-28
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