随着城市轨道交通事业的快速发展，盾构法施工技术在隧道建设中已得到广泛应用。结合北京站—北京西站地下直径线工程的盾构始发、盾构穿越护城河及下穿宣武门地铁站等施工实践，介绍在砂卵石地质条件下利用盾构法修建隧道的关键施工技术，以期为类似工程施工提供借鉴。

Along with the rapid development of MRT project in urban areas, shield tunneling method has been widely used in tunnel construction. On Basis of the shield boring experience in the construction of Beijing Rail Transit Line from Beijing Railway Station to West Beijing Railway Station in respect of shield launching, boring under the citydefense river and boring under Xuanwumen Metro Station, the author presents the key technologies of constructing tunnels in sand and pebble ground by shield boring method. This paper can provide reference for the construction of similar projects in the future.