分层非饱和土壤的一维固结分析:集成界面流动和空气接触阻力效应的改进模型

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
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引用次数: 0

摘要

层状非饱和土壤具有复杂的机械和物理特性。由于非饱和土界面之间的粗糙度和不规则分布的微孔的存在,本研究探讨了孔隙水在低速下的层流和孔隙空气在这些通道中的逆环流。针对非饱和土壤受流动和空气接触阻力影响的复杂固结行为,建立了一个改进模型。该模型包含流动接触传递系数 (Rω)、流动分区系数 (ηω)、空气接触传递系数 (Ra) 和空气分区系数 (ηa)。通过拉普拉斯变换及其逆变换,得出了分层非饱和土中孔隙水压力、孔隙气压和沉降的半解析解。通过与现有解决方案的对比分析,验证了模型的合理性。对改进模型的分析得出了重要结论:流动和空气接触阻力的存在会导致界面处相对孔隙压力和空气压力梯度的发展,从而减小水相(kω)和气相(ka)渗透系数对固结过程的影响。此外,忽略流动和空气接触阻力效应可能会导致高估沉降量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
One-dimensional consolidation analysis of layered unsaturated soils: An improved model integrating interfacial flow and air contact resistance effects
Layered unsaturated soils exhibit complex mechanical and physical properties. Owing to the roughness between unsaturated soil interfaces and the presence of irregularly distributed micro-pores, this study explores the laminar flow of pore water and counter-cyclonic flow of pore air through these channels at low velocities. In response to the complex consolidation behavior of unsaturated soils influenced by the flow and air contact resistance, an improved model is developed. The model incorporates the flow contact transfer coefficient (Rω), flow partition coefficient (ηω), air contact transfer coefficient (Ra) and air partition coefficient (ηa). Semi-analytical solutions for pore water pressure, pore air pressure and settlement in layered unsaturated soils are derived by employing the Laplace transform and its inverse transform. The rationality of the model is validated through comparative analysis with existing solutions. Analysis of the improved model yields critical insights: the presence of flow and air contact resistance leads to the development of relative pore pressure and air pressure gradients at interfaces, which diminishes the influence of the permeability coefficients of the water phase (kω) and air phase (ka) on the consolidation process. Moreover, neglecting the flow and air contact resistance effects may lead to an overestimation of settlement.
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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