Construction technology of “tunneling and top-down method” at west Tian’anmen station in metro of Beijing

The construction method of “tunneling and top-down method” at west Tian′anmen station in metro of Beijing is introduced,and the measured settlement of ground surface,the measured pressure of surrounding rock and the internal force of strut are analyzed.This method,which combines“top-down method” and “shallow tunneling method”,possesses the advantages,such as economization, safety and rapid construction,ect,and it can be applied to large underground engineering in the flourishing area of city.