Investigation into Progressive Failure Mechanisms of Geosynthetic-Reinforced Pile Supported Embankment Considering Strain Softening Behaviors of Cemented Soils
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摘要: 针对目前水泥土桩承加筋路堤稳定性计算较少考虑水泥土应变软化特性的不足，采用无筋水泥材料破坏后特性的应变软化模型（Concrete Model，CM）研究桩承加筋路堤的失稳过程，通过分析不同位置桩体受力特性和桩体塑性区的发展情况，探究桩体的破坏顺序及破坏模式.结果表明：CM模型能够准确地模拟应变软化对水泥土剪切和弯曲破坏的影响，忽略水泥土桩的应变软化特性会高估桩承加筋路堤稳定性；水泥土桩破坏由桩身弯矩和轴力分布控制，桩体破坏诱发的应力释放引起临近桩体的内力变化，导致临近桩体发生渐进破坏；坡面下的桩体容易发生弯曲破坏，破坏方向由坡脚向路堤中心延伸，而路面下的桩体容易发生剪切破坏，破坏方向由路堤中心向坡脚延伸；加筋体刚度的提高会降低桩体的弯矩，桩承加筋路堤的破坏模式由渐进破坏转变为承载力不足的瞬时破坏.Abstract: There is a lack of research on stability of geosynthetic reinforced pile supported (GRPS) embankments considering the strain softening behaviors of cement-soil piles.In this paper, Concrete Model (CM), which can reflect the post-failure behavior of cement-soil, was used to model the progressive failure mechanisms of GRPS embankments.The sequences and modes of cement-soil pile failure are investigated by examining the developments of plastic zone and force changes of cement-soil piles in different locations.The results show that the CM can accurately simulate the effect of strain-softening on the shear and bending failure of cement-soil, and ignoring the strain-softening characteristics of cement-soil pile will overestimate the stability of GRPS embankments.The failure of cement-soil piles is controlled by the distribution of bending moment and axial force, the stress relief induced by failure of pile leads to a significant increase of internal force in the neighboring piles, causing the progressive failure of the neighboring piles.The piles beyond the slope shoulder are more prone to bending failure, the failure firstly occurs at the slope foot and gradually extends to the center of embankment.However, the piles inside the embankment is more prone to shear failure, and the failure direction extends from the embankment center to the slop foot.The increase in the stiffness of the reinforcement decreases the bending moment of the piles, and the failure mode of GRPS embankment changes from progressive failure to instantaneous failure.
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