Chunwei Zhang, Xiaojun Zhou, Kejia Yang, Yunpeng Hu
{"title":"砂卵石土地基中考虑含水率和密实度的隧道围岩荷载计算模型","authors":"Chunwei Zhang, Xiaojun Zhou, Kejia Yang, Yunpeng Hu","doi":"10.1007/s10064-025-04450-5","DOIUrl":null,"url":null,"abstract":"<div><p>Sandy pebble soil presents issues such as loose surrounding rock and collapse during tunnel excavation due to its sensitivity to moisture content and compactness. This study combines indoor large-scale triaxial tests and numerical triaxial tests using particle discrete elements to calibrate the microstructure parameters of sandy pebble soil under different conditions. The relationship between shear strength parameters and moisture content and compactness is established. The barn effect principle is introduced to develop a method for calculating tunnel surrounding rock load, fully considering the influence of compactness and moisture content. Key findings include: (1) increased stress peak with higher compactness and lower moisture content, and increased internal friction angle with decreasing moisture content or increasing compactness; (2) identification of critical microstructure parameters affecting strength properties, such as particle contact modulus, friction coefficient, and porosity; (3) validation of the Janssen model for sandy pebble soil layer load calculation; (4) derivation of a formula for calculating the vertical load of sandy pebble soil tunnel surrounding rock, revealing the influence of compactness and moisture content on lateral pressure.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 9","pages":""},"PeriodicalIF":4.2000,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Calculation model of tunnel surrounding rock load considering moisture content and compactness in sandy pebble soil ground\",\"authors\":\"Chunwei Zhang, Xiaojun Zhou, Kejia Yang, Yunpeng Hu\",\"doi\":\"10.1007/s10064-025-04450-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Sandy pebble soil presents issues such as loose surrounding rock and collapse during tunnel excavation due to its sensitivity to moisture content and compactness. This study combines indoor large-scale triaxial tests and numerical triaxial tests using particle discrete elements to calibrate the microstructure parameters of sandy pebble soil under different conditions. The relationship between shear strength parameters and moisture content and compactness is established. The barn effect principle is introduced to develop a method for calculating tunnel surrounding rock load, fully considering the influence of compactness and moisture content. Key findings include: (1) increased stress peak with higher compactness and lower moisture content, and increased internal friction angle with decreasing moisture content or increasing compactness; (2) identification of critical microstructure parameters affecting strength properties, such as particle contact modulus, friction coefficient, and porosity; (3) validation of the Janssen model for sandy pebble soil layer load calculation; (4) derivation of a formula for calculating the vertical load of sandy pebble soil tunnel surrounding rock, revealing the influence of compactness and moisture content on lateral pressure.</p></div>\",\"PeriodicalId\":500,\"journal\":{\"name\":\"Bulletin of Engineering Geology and the Environment\",\"volume\":\"84 9\",\"pages\":\"\"},\"PeriodicalIF\":4.2000,\"publicationDate\":\"2025-08-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Engineering Geology and the Environment\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10064-025-04450-5\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Engineering Geology and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10064-025-04450-5","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
Calculation model of tunnel surrounding rock load considering moisture content and compactness in sandy pebble soil ground
Sandy pebble soil presents issues such as loose surrounding rock and collapse during tunnel excavation due to its sensitivity to moisture content and compactness. This study combines indoor large-scale triaxial tests and numerical triaxial tests using particle discrete elements to calibrate the microstructure parameters of sandy pebble soil under different conditions. The relationship between shear strength parameters and moisture content and compactness is established. The barn effect principle is introduced to develop a method for calculating tunnel surrounding rock load, fully considering the influence of compactness and moisture content. Key findings include: (1) increased stress peak with higher compactness and lower moisture content, and increased internal friction angle with decreasing moisture content or increasing compactness; (2) identification of critical microstructure parameters affecting strength properties, such as particle contact modulus, friction coefficient, and porosity; (3) validation of the Janssen model for sandy pebble soil layer load calculation; (4) derivation of a formula for calculating the vertical load of sandy pebble soil tunnel surrounding rock, revealing the influence of compactness and moisture content on lateral pressure.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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