{"title":"Mechanism and modeling of infiltration of saturated sand by excavated sand-containing slurry","authors":"","doi":"10.1016/j.tust.2024.106003","DOIUrl":null,"url":null,"abstract":"<div><p>During slurry pressure-balance (SPB) shield tunneling in a sand layer, the excavated sand mixes with bentonite slurry. Herein, the pressure infiltration of the saturated sand by the bentonite–sand slurry is modeled to describe the slurry and companion-water flows during the mud spurt period. A maximum infiltration-depth prediction model is also implemented, based on the principles of particle deep-bed filtration. The model closely matches experimental results for a slurry with a low sand-to-bentonite mass ratio, but tends to overestimate the infiltration distance as the mass ratio increases. Furthermore, the prediction model reflects the continuous infiltration phenomenon associated with elevated sand concentrations in the slurry. When combined with the maximum-depth prediction model, the infiltration model strongly aligns with the experimental findings for the mud spurt period. The combined model effectively explains the bentonite–sand slurry infiltration mechanism and accurately predicts mud-spurt occurrences during SPB shield tunneling in sandy layers.</p></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tunnelling and Underground Space Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0886779824004218","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
During slurry pressure-balance (SPB) shield tunneling in a sand layer, the excavated sand mixes with bentonite slurry. Herein, the pressure infiltration of the saturated sand by the bentonite–sand slurry is modeled to describe the slurry and companion-water flows during the mud spurt period. A maximum infiltration-depth prediction model is also implemented, based on the principles of particle deep-bed filtration. The model closely matches experimental results for a slurry with a low sand-to-bentonite mass ratio, but tends to overestimate the infiltration distance as the mass ratio increases. Furthermore, the prediction model reflects the continuous infiltration phenomenon associated with elevated sand concentrations in the slurry. When combined with the maximum-depth prediction model, the infiltration model strongly aligns with the experimental findings for the mud spurt period. The combined model effectively explains the bentonite–sand slurry infiltration mechanism and accurately predicts mud-spurt occurrences during SPB shield tunneling in sandy layers.
期刊介绍:
Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.