吉图珲高铁延吉膨胀岩土工程特性与边坡治理研究OA

Based on the GDK279 slope of Jilin-Tumen-Hunchun High-speed Railway,research and analysis are conducted on the engineering characteristics of swelling rock in severe cold areas,slope deformation characteristics,determination of sliding surfaces(zones)and selection of geotechnical parameters,and stability analysis and exploration of engineering governance strategies are carried out.Research shows that the swelling rocks in Yanji area mainly include two types:Cretaceous mudstone,muddy sandstone,and Quaternary cohesive soil with angular gravel,crushed stones,block stones,and sporadic basalt boulders.The microstructure of clay minerals is mainly sheet-like,with a moderate to strong expansion potential.The surface soil is subjected to long-term and repeated freeze-thaw cycles,with developed fissures and loose structures.The cohesive soil layer contains a large amount of coarse grained breccia and gravel,forming a structure of water seepage and storage.There are many discontinuous surfaces caused by mixing,which is inconducive to the stability of the slope.After long-term unloading,atmospheric rainfall and weathering,the slope slides and deforms along the weak structural surface or soil rock interface,which can be attributed to step traction and multi-layer sliding.According to the design concept of"combination of active and passive support,coordinated drainage of sliding bodies and surface interception and drainage",the slope treatment is effective.After the treatment,the GDK279 slope has been stable for nearly a decade,and its experience can provide reference for similar landslide engineering treatment.