{"title":"可液化夹层场地盾构隧道地震响应数值模拟研究","authors":"Lianjin Tao, Shuya Li, Jing Pan, Bohan Song","doi":"10.1002/eer2.70011","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>Soil liquefaction under seismic loading poses a significant threat to the structural safety of shield tunnels, especially those located in liquefiable interlayered grounds, which are more prone to severe damage. This study employs the CycLiqCPSP model to develop a two-dimensional saturated soil-shield tunnel interaction framework, examining seismic responses of shield tunnels under five spatial configurations of liquefiable soil layers. Resonant column tests and triaxial tests were conducted to calibrate the constitutive model parameters for liquefiable soils in the Beijing area, and the accuracy of these parameters was validated through element test simulations. The results indicate that, compared with shield tunnels in homogeneous liquefiable soils, the spatial distribution of liquefiable interlayers has a significant impact on the seismic response of the soil-structure interaction system. This influence leads to increased deformation, internal forces, and significantly higher damage levels in the tunnel structure. When the tunnel's base crosses the liquefiable layer, lateral deformation is notably amplified, causing severe structural damage and representing the most adverse seismic design scenario. Additionally, during seismic events, drainage channels may form in the middle section of double-track tunnels, heightening the risk of liquefaction. The study also reveals that the internal forces and deformations at the tunnel's haunches and toes are significantly higher than at other locations, necessitating special attention to these areas for potential damage. These findings offer essential theoretical guidance and scientific insights for the seismic design of shield tunnels in liquefiable interlayered grounds under strong earthquakes.</p></div>","PeriodicalId":100383,"journal":{"name":"Earthquake Engineering and Resilience","volume":"4 2","pages":"266-278"},"PeriodicalIF":1.9000,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eer2.70011","citationCount":"0","resultStr":"{\"title\":\"Numerical Simulation Study on the Seismic Response of Shield Tunnels in Liquefiable Interlayer Site\",\"authors\":\"Lianjin Tao, Shuya Li, Jing Pan, Bohan Song\",\"doi\":\"10.1002/eer2.70011\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n <p>Soil liquefaction under seismic loading poses a significant threat to the structural safety of shield tunnels, especially those located in liquefiable interlayered grounds, which are more prone to severe damage. This study employs the CycLiqCPSP model to develop a two-dimensional saturated soil-shield tunnel interaction framework, examining seismic responses of shield tunnels under five spatial configurations of liquefiable soil layers. Resonant column tests and triaxial tests were conducted to calibrate the constitutive model parameters for liquefiable soils in the Beijing area, and the accuracy of these parameters was validated through element test simulations. The results indicate that, compared with shield tunnels in homogeneous liquefiable soils, the spatial distribution of liquefiable interlayers has a significant impact on the seismic response of the soil-structure interaction system. This influence leads to increased deformation, internal forces, and significantly higher damage levels in the tunnel structure. When the tunnel's base crosses the liquefiable layer, lateral deformation is notably amplified, causing severe structural damage and representing the most adverse seismic design scenario. Additionally, during seismic events, drainage channels may form in the middle section of double-track tunnels, heightening the risk of liquefaction. The study also reveals that the internal forces and deformations at the tunnel's haunches and toes are significantly higher than at other locations, necessitating special attention to these areas for potential damage. These findings offer essential theoretical guidance and scientific insights for the seismic design of shield tunnels in liquefiable interlayered grounds under strong earthquakes.</p></div>\",\"PeriodicalId\":100383,\"journal\":{\"name\":\"Earthquake Engineering and Resilience\",\"volume\":\"4 2\",\"pages\":\"266-278\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2025-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eer2.70011\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Earthquake Engineering and Resilience\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/eer2.70011\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Earthquake Engineering and Resilience","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/eer2.70011","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Numerical Simulation Study on the Seismic Response of Shield Tunnels in Liquefiable Interlayer Site
Soil liquefaction under seismic loading poses a significant threat to the structural safety of shield tunnels, especially those located in liquefiable interlayered grounds, which are more prone to severe damage. This study employs the CycLiqCPSP model to develop a two-dimensional saturated soil-shield tunnel interaction framework, examining seismic responses of shield tunnels under five spatial configurations of liquefiable soil layers. Resonant column tests and triaxial tests were conducted to calibrate the constitutive model parameters for liquefiable soils in the Beijing area, and the accuracy of these parameters was validated through element test simulations. The results indicate that, compared with shield tunnels in homogeneous liquefiable soils, the spatial distribution of liquefiable interlayers has a significant impact on the seismic response of the soil-structure interaction system. This influence leads to increased deformation, internal forces, and significantly higher damage levels in the tunnel structure. When the tunnel's base crosses the liquefiable layer, lateral deformation is notably amplified, causing severe structural damage and representing the most adverse seismic design scenario. Additionally, during seismic events, drainage channels may form in the middle section of double-track tunnels, heightening the risk of liquefaction. The study also reveals that the internal forces and deformations at the tunnel's haunches and toes are significantly higher than at other locations, necessitating special attention to these areas for potential damage. These findings offer essential theoretical guidance and scientific insights for the seismic design of shield tunnels in liquefiable interlayered grounds under strong earthquakes.