地质学报2024，Vol.98Issue(3)：992-1005,14.DOI:10.19762/j.cnki.dizhixuebao.2023063
青藏高原构造混杂岩带的孕灾地质基因与重大工程地质问题研究
Research on hazard prone geological genes and major engineering geological problems in tectonic mélange belts of Tibetan Plateau
摘要
Abstract
The hazard-prone geological genes refer to the internal key factors that promote the conception of geohazards in a certain region.The special tectonic position of the plate tectonic mélange belt determines its complex geological evolution process and distinct geological characteristics,making it a critical zone for major engineering geological problems and frequent geological disasters.By examining the main geological characteristics of the tectonic mélange belts on the Tibetan Plateau,this paper summarizes and analyzes the special geological factors associated with geohazards.These factors include active geological structures,complex hydrothermal conditions,mixed lithologies,special altered soft rocks,and tectonic karst water channels,all of which serve as key contributors to major geohazards and engineering geological risks.Combined with typical cases,the causes of large-scale landslides in tectonic mélange belts are analyzed,primarily divided into three types:tectonic control type,argillaceous soft rock control type,and altered ophiolite belt control type.Among them,the altered ophiolite belt exhibits the most distinctive prone-to-slide geological structure within the tectonic mélange belt,characterized by a combination of specific lithology and geological structures.Tunnel engineering within tectonic mélange belts experiences five main deformation and failure modes,including collapse,horizontal convergence,circular convergence,floor lift,and dislocation.The unfavorable engineering characteristics of clayey altered soft rock are an important factor restricting the stability of tunnel surrounding rock within the tectonic mélange belt.In view of traditional engineering geological theory and risk prevention and control technology,this study identifies key research areas and proposes disaster prevention and mitigation strategies to address the challenges faced by large-scale engineering construction in the tectonic mélange belt.关键词
板块构造结合带/地质基因/蚀变蛇绿岩带/斜坡地质灾害/隧道稳定性Key words
plate tectonic suture zone/geological gene/altered ophiolite zone/slope geohazard/tunnel stability引用本文复制引用
张永双,王冬兵,李雪,吴瑞安,唐渊,任三绍,李金秋,罗亮..青藏高原构造混杂岩带的孕灾地质基因与重大工程地质问题研究[J].地质学报,2024,98(3):992-1005,14.基金项目
本文为国家自然科学基金项目(编号41941017)和国家地质调查专项项目(编号20190505)联合资助的成果. （编号41941017）
