Abstract：Research purposes: The problem of roadbed settlement is the main cause of engineering accidents in infrastructure such as railways and highways. In order to improve the settlement prediction level of roadbed soil in soft soil areas, considering the non-Darcian flow of soil, the variable drainage boundary, and the nonlinear deformation characteristics, this paper proposes the corresponding piecewise-linear consolidation model. Among them, the seepage model with the threshold hydraulic gradient is used to reflect the effect of non-Darcian flow, the continuous drainage boundary is used to describe the changes in the permeability performance of soil boundaries, and the relationship of e-lg(av0) is used to represent the nonlinear deformation characteristics of soil. Then, some examples are used to analyze the change of boundary permeability, nonlinear deformation of soil and consolidation behavior of soil under non-Darcian effect, in order to provide theoretical support for the prediction of settlement after construction of soft soil roadbed. Research conclusions: (1) The stronger the non-Darcian effect of soil ( i.e. the larger the value of the threshold hydraulic gradient), the worse the boundary permeability ( i.e. the smaller the interface parameter), and the more obvious the phenomenon of consolidation hysteresis at the same time. (2) The value of the threshold hydraulic gradient can simultaneously affect the consolidation process and the final result. (3) The initial compression coefficient considering the threshold hydraulic gradient and the continuous drainage boundary has a significant impact on the settlement process. (4) The proposed consolidation model can simulate the settlement process of deep soft soil subgrade, and the relevant conclusions can be applied to the process of pile loading drainage reinforcement of deep soft soil.
骆嘉成,邵吉成.固结-固化复合技术分层加固淤泥的试验研究[J].铁道工程学报,2022(11):19-24.Luo Jiacheng, Shao Jicheng.Experimental Research on the Layered Reinforcement of Sludge by Consolidation and Solidification Composite Technology[J]. Journal of Railway Engineering Society, 2022(11):19-24.
[2]
程红梅. 布袋注浆桩地基加固扰动影响试验研究[J]. 铁道工程学报, 2023(4): 12-17.Cheng Hongmei.Experimental Research on the Foundation Reinforcement Disturbance Influence of Bag Grouting Pile[J]. Journal of Railway Engineering Society, 2023(4): 12-17.
[3]
吴思思, 罗文强. 考虑孔隙演变的软土一维非线性固结有限差分分析[J]. 长江科学院院报, 2022(3): 118-124.Wu Sisi, Luo Wenqiang.One-dimensional Nonlinear Consolidation of Soft Soil by Finite Difference Method Considering Pore Evolution[J]. Journal of Yangtze River Scientific Research Institute, 2022(3): 118-124.
[4]
陈余, 李传勋. 连续排水边界下考虑起始坡降的软黏土固结解[J].工程力学, 2021(9): 161-170.Chen Yu, Li Chuanxun.Consolidation Analysis of Soft Clay Considering Threshold Hydraulic Gradient and a Continuous Drainage Boundary[J]. Engineering Mechanics, 2021(9): 161-170.
[5]
梅国雄, 夏君, 梅岭. 基于不对称连续排水边界的太沙基一维固结方程及其解答[J]. 岩土工程学报, 2011(1): 28-31.Mei Guoxiong, Xia Jun, Mei Ling.Terzaghi’s One-dimensional Consolidation Equation and Its Solution Based on Asymmetric Continuous Drainage Boundary[J]. Chinese Journal of Geotechnical Engineering, 2011(1): 28-31.
[6]
Zong Mengfan, Wu Wenbing, El Naggar M.Hesham, etc. Analysis of One-Dimensional Consolidation for Double-Layered Soil with Non-Darcian Flow Based on Continuous Drainage Boundary[J]. International Journal of Geomechanics, 2023(3): 04022306.
[7]
刘忠玉, 张家超, 夏洋洋, 等. 基于分段线性化模型的一维流变固结分析[J]. 同济大学学报:自然科学版,2019(5): 640-647.Liu Zhongyu, Zhang Jiachao, Xia Yangyang, etc. One-dimensional Rheological Consolidation Analysis of Saturated Soft Clay Based on Piecewise-linear Model[J]. Journal of Tongji University:Natural Science, 2019(5): 640-647.
2024, Vol. 41 
版权所有 © 2014 《铁道工程学报》编辑部