{"title":"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","authors":"","doi":"10.1016/j.compgeo.2024.106791","DOIUrl":null,"url":null,"abstract":"<div><div>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 <span><math><mrow><mo>(</mo><msub><mi>R</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span>, flow partition coefficient <span><math><mrow><mo>(</mo><msub><mi>η</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span>, air contact transfer coefficient <span><math><mrow><mo>(</mo><msub><mi>R</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span> and air partition coefficient <span><math><mrow><mo>(</mo><msub><mi>η</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span>. 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 <span><math><mrow><mo>(</mo><msub><mi>k</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span> and air phase <span><math><mrow><mo>(</mo><msub><mi>k</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span> on the consolidation process. Moreover, neglecting the flow and air contact resistance effects may lead to an overestimation of settlement.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"One-dimensional consolidation analysis of layered unsaturated soils: An improved model integrating interfacial flow and air contact resistance effects\",\"authors\":\"\",\"doi\":\"10.1016/j.compgeo.2024.106791\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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 <span><math><mrow><mo>(</mo><msub><mi>R</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span>, flow partition coefficient <span><math><mrow><mo>(</mo><msub><mi>η</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span>, air contact transfer coefficient <span><math><mrow><mo>(</mo><msub><mi>R</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span> and air partition coefficient <span><math><mrow><mo>(</mo><msub><mi>η</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span>. 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 <span><math><mrow><mo>(</mo><msub><mi>k</mi><mi>ω</mi></msub><mo>)</mo></mrow></math></span> and air phase <span><math><mrow><mo>(</mo><msub><mi>k</mi><mi>a</mi></msub><mo>)</mo></mrow></math></span> on the consolidation process. Moreover, neglecting the flow and air contact resistance effects may lead to an overestimation of settlement.</div></div>\",\"PeriodicalId\":55217,\"journal\":{\"name\":\"Computers and Geotechnics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-09-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Computers and Geotechnics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0266352X24007304\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computers and Geotechnics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0266352X24007304","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}
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 , flow partition coefficient , air contact transfer coefficient and air partition coefficient . 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 and air phase on the consolidation process. Moreover, neglecting the flow and air contact resistance effects may lead to an overestimation of settlement.
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.