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Analysis of microstructure and spatially dependent permeability of soft soil during consolidation deformation
Soils and Foundations ( IF 3.7 ) Pub Date : 2021-03-26 , DOI: 10.1016/j.sandf.2021.02.004
Cuiying Zhou , Lei Yu , Zirong Huang , Zhen Liu , Lihai Zhang

The fundamental understanding of the consolidation and deformation behaviour of soft soil is of critical importance in engineering geology. The purpose of this study is to develop a nonlinear consolidation model for investigating the deformation behaviour of the montmorillonite soft soil under different engineering loading conditions and the effectiveness of various drainage plate configurations for soil enhancement. The model considers the change of soil microstructure and spatially dependent permeability during the consolidation process. The model predictions were also validated by using collected engineering geology field-testing data and developing advanced imaging processing techniques. The results show that model predictions can reproduce the experimentally observed deformation behaviour of soft soil reasonably well. In addition, the permeability of the soft soil decreases with the decrease of the volume and diameter of pores with the discharge of water from pores during the consolidation process, and there is a negative exponential relationship between pore ratio and depth of the soft soil. Furthermore, it indicates that the vacuum drainage preloading could effectively accelerate the consolidation settlement of the soft soil through playing the role of vertical drainage and reducing the distance of the soil drainage, whereas the increase of the length of the drainage plate has no obvious effect on the settlement of the soil.



中文翻译:

固结变形过程中软土的微观结构和空间相关渗透性分析

对软土的固结和变形行为的基本理解在工程地质中至关重要。本研究的目的是开发一种非线性固结模型,用于研究蒙脱石软土在不同工程加载条件下的变形行为以及各种排水板配置对土壤增强的有效性。该模型考虑了固结过程中土壤微观结构和空间相关渗透率的变化。模型预测还通过使用收集的工程地质现场测试数据和开发先进的成像处理技术进行了验证。结果表明,模型预测可以较好地再现实验观察到的软土变形行为。此外,软土在固结过程中,随着水分从孔隙中排出,随着孔隙体积和直径的减小,其渗透性降低,孔隙率与软土深度呈负指数关系。进一步说明真空排水预压通过起到垂直排水的作用,减少排水距离,可以有效加速软土的固结沉降,而排水板长度的增加对软土的固结沉降没有明显影响。土壤的沉降。孔隙率与软土深度呈负指数关系。进一步说明真空排水预压通过起到垂直排水的作用,减少排水距离,可以有效加速软土的固结沉降,而排水板长度的增加对软土的固结沉降没有明显影响。土壤的沉降。孔隙率与软土深度呈负指数关系。进一步说明真空排水预压通过起到垂直排水的作用,减少排水距离,可以有效加速软土的固结沉降,而排水板长度的增加对软土的固结沉降没有明显影响。土壤的沉降。

更新日期:2021-03-26
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