交通隧道大变形致灾机理与施工控制技术研究进展OA

Large tunnel deformation is the most typical engineering geological disaster under complex geological conditions,especially in deep-buried soft rock tunnel engineering.Its occurrence and evolution are controlled by the coupling of multiple factors such as in-situ stress field,structure and mechanical properties of surrounding rock,groundwater activity,and support system response,and it often exhibits progressively accumulative deformation characteristics.Based on Chinese and international studies and typical engineering cases,the definition and classification standards of large tunnel deformation were systematically reviewed.According to dominant hazard-causing mechanisms,large tunnel deformation was classified into four categories:loosening-fracturing type,stress-controlled type,swelling-controlled type,and structure-controlled type,and dominant factors and typical engineering manifestations of each category were clarified.Furthermore,starting from multi-factor coupling mechanisms,key technical paths of construction control were summarized,covering aspects of in-situ stress regulation,surrounding rock improvement,groundwater control,and support system optimization.Two types of support measures,namely resistance-dominated and yielding-dominated ones,were specially summarized.A theoretical basis and engineering references can be provided for mechanism identification,classification recognition,and construction control of large tunnel deformation in complex geological environments.