Nonlinear creep consolidation of vertical drain-improved soft ground with time-dependent permeable boundary under linearly construction load

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-09-19 DOI:10.1016/j.geotexmem.2024.09.001
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Abstract

This paper presents an upgraded nonlinear creep consolidation model for VDI soft ground, incorporating a modified UH relation to capture soil creep deformation. Key novelties also include considering linear construction loads, TDP boundary conditions, and Swartzendruber's flow in the small strain consolidation domain. The system was solved using the implicit finite difference method, and numerical solutions were rigorously validated. A parametric analysis reveals that soil viscosity causes abnormal EPP increases under poor drainage conditions during early consolidation. Meanwhile, neglecting the time effect of the secondary consolidation coefficient delayed the overall EPP dissipation process and overestimated the settlement during the middle and late consolidation stages. Furthermore, TDP boundaries, Swartzendruber's flow, and construction processes significantly influence the creep consolidation process but not the final settlement. These findings offer fresh insights into the nonlinear creep consolidation of VDI soft ground, advancing the field.

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具有随时间变化的渗透边界的垂直排水改良软土地基在线性施工荷载作用下的非线性蠕变固结
本文针对 VDI 软土地基提出了一种升级的非线性蠕变固结模型,该模型采用了改进的 UH 关系来捕捉土壤蠕变变形。主要创新还包括考虑线性施工荷载、TDP 边界条件和小应变固结域中的 Swartzendruber 流。该系统采用隐式有限差分法求解,并对数值解进行了严格验证。参数分析表明,在排水条件较差的早期固结过程中,土壤粘性会导致 EPP 异常增加。同时,忽略二次固结系数的时间效应会延迟整个 EPP 消散过程,并高估中后期固结阶段的沉降量。此外,TDP 边界、Swartzendruber 流量和施工过程对蠕变固结过程有显著影响,但对最终沉降没有影响。这些发现为 VDI 软土地基的非线性蠕变固结提供了新的见解,推动了该领域的发展。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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