装配式衬砌是将若干在工厂或现场预制的构件运入坑道内，用机械拼装而成，一经装配，即可承受围岩压力。
组合式盾构的特点是能自行推进，可不用装配式衬砌管片，而采用现浇钢筋混凝土衬砌。
Composite shield is characterized by self - driving and cast in site reinforced concrete lining instead of segmental lining.
软弱围岩隧洞在设计上采用钢筋混凝土装配式预制构件衬砌的方式近年来越来越多，但在施工上还一直没有形成一套较完善的衬砌安装方法。
In recent years the reinforced concrete precast element linings are adopted more and more for the soft surrounding rock tunnels. But a perfect assembling method for lining is not performed yet.
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