Study On Properties And Stability Of Surrounding Rock For Exceptionally Large Scale Underground Railway Station

New Beijing-Zhangjiakou Inter-city railway Badaling underground station is the key controlling engineering of the New Beijing-Zhangjiakou Inter-city Railway; studying the stability of surrounding rock of station site areas, can provide important theory basis for the engineering construction.This paper is based on the New Beijing-Zhangjiakou Inter-city Railway Badaling Underground Station. In summary on the basis of predecessors' achievements, the thesis analyzed topography and geomorphology, stratigraphic lithology, geological structures of the station site areas. In the basis of gathering on-site investigation information and in-outdoor experiment results, this paper researched on the stability of surrounding rock.The conclusions are as follows:(1)This thesis summarized the domestic and foreign similar project summary and analysis methods of the stability of surrounding rock,and provided reference for the research of the surrounding rock stability of station site areas summarizes.(2) According to the field experiment and indoor experiment results, the thesis analyzes the initial stress field of rock mass and rock mechanical properties; Through the field exploration and drilling, the thesis points out the complete degree and rock stratigraphic lithology; through pumping experiment, the thesis obtains the groundwater condition of the station site areas.(3) Based on the field exploration reports and the in-outdoor experimental results, this thesis uses RMR system and Q system to make a division on the rock of the station site areas. The results show that, the strongly weathered layer and the fully weathered layer of the station site areas belongs toâ…£. The rock of the underground station belongs toâ…¢basically. And syenite belongs toâ…¢belongs toâ…¢too.(4) This thesis uses ABAQUS to simulate the station cavern excavation process, makes detailed analysis of the characteristics of stress field and displacement field characteristics, plastic damage area for the rock of the no supporting cave, and provides theoretical basis for the better chosen of the later Badaling underground station's Supporting parameters.