铁道科学与工程学报2025，Vol.22Issue(1)：416-428,13.DOI:10.19713/j.cnki.43-1423/u.T20240454
堆载预压下塑料排水板地基的侧向变形预测方法
Prediction method for lateral deformation of prefabricated vertical drains improved ground under surcharge preloading
摘要
Abstract
To investigate the lateral deformation characteristics of prefabricated vertical drains improved ground under surcharge preloading and establish corresponding prediction method for lateral deformation,a radial drained triaxial test and numerical simulations under multiple conditions were conducted based on a self-developed improved triaxial test device.The influence of vertical stress,horizontal stress,loading rate,and initial effective stress on the soil lateral deformation and stress ratio was systematically studied.The results indicate that the lateral deformation of soil increases nonlinearly with the increase of vertical stress,the decrease of horizontal stress,the increase of loading rate,and the decrease of initial effective stress.The representative stress ratio of soil(K*e)nonlinearly decreases with the increase of loading rate and the decrease of initial effective stress,approximately linearly increases with the increase of horizontal stress,and first decreases linearly and then nonlinearly with the increase of vertical stress.There is a significant horizontal additional stress in the shallow layer of the ground under surcharge preloading,and its impact on the ground lateral deformation cannot be ignored.The combined effect of horizontal and vertical additional stresses promotes the lateral deformation of vertical drains improved ground under preloading first increases and then decreases with depth,presenting an arched distribution shape.Based on the results,a normalized relationship between the stress ratio K*e and the final horizontal strain εh of the soil is established.Additionally,a comprehensive influence factor β is proposed,which considers the surcharge preloading parameters and the radial consolidation properties of the soil.The K*e under different conditions can be estimated through the linear fitting relationship between β and K*e.Combining the εh-K*e and K*e-β relationships,a prediction method for the lateral deformation profile of the vertical drains improved ground under surcharge preloading is proposed.The developed method is applied to analyze two field engineering cases and good prediction results are obtained.The research results can provide a reference for the analysis and design of vertical drains improved ground under surcharge preloading.关键词
堆载预压/塑料排水板/改进三轴试验/侧向变形/预测方法Key words
surcharge preloading/prefabricated vertical drain/modified triaxial test/lateral deformation/prediction method分类
建筑与水利引用本文复制引用
徐方,吴其长,门小雄,杨俊芳,彭扬发,解裕荣,杨奇..堆载预压下塑料排水板地基的侧向变形预测方法[J].铁道科学与工程学报,2025,22(1):416-428,13.基金项目
湖南省自然科学基金资助项目(2021JJ40766) （2021JJ40766）
珠海隧道工程科技研发项目 （）
中铁广州工程局集团有限公司施工关键技术研究项目(城建青岛地铁09-01字(2023)工程-技术-06) （城建青岛地铁09-01字(2023）
