A two-stage combined filtration-consolidation model for slurry ground treated by vacuum preloading

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Xiaoqian Ye, Li Shi, Yuanqiang Cai
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引用次数: 0

Abstract

The vacuum preloading technique is extensively employed for ground improvement, particularly for slurry ground characterized by high-water content and low strength. Such ground frequently exhibits a delay in pore water pressure dissipation when treated with prefabricated vertical drains. To clarify the drainage and consolidation behaviour of high-water content slurry ground under vacuum preloading, this study proposed a two-stage combined model that integrates both filtration and consolidation processes. Initially, an axisymmetric filtration model was used to describe the formation of the soil column through the radial migration and compaction of the particles. The end-of-filtration radial distributions of void ratio, permeability coefficient, and effective pressure served as initial conditions for the consolidation stage analysis. This stage was depicted using a large strain consolidation model based on the free strain condition. The results showed the necessity of incorporating the filtration stage to capture the overall drainage mechanism and characteristics of slurry ground with vacuum preloading treatment.

用真空预加载法处理泥浆地面的两阶段组合过滤-固结模型
真空预压技术被广泛应用于地基改良,尤其是含水量高、强度低的泥浆地基。在使用预制垂直排水沟处理此类地层时,孔隙水压力消散经常会出现延迟。为明确真空预压下高含水量泥浆地层的排水和固结行为,本研究提出了一种两阶段组合模型,将过滤和固结过程整合在一起。首先,采用轴对称过滤模型来描述通过颗粒径向迁移和压实形成土柱的过程。过滤结束时的空隙率、渗透系数和有效压力的径向分布作为固结阶段分析的初始条件。该阶段使用基于自由应变条件的大应变固结模型进行描述。结果表明,有必要结合过滤阶段来捕捉经真空预加载处理的泥浆地面的整体排水机制和特征。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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