全断面掘进机通常只能开挖圆形断面的隧洞,它具有快速而安全的优点,所以在水利、发电等引水隧洞施工中较易发挥优势。但我们日常生活、生产中需要较多的门洞形断面的隧洞如铁路隧道、公路隧道、煤矿巷道、防空巷道等。为此,如何用开挖圆形断面的全断面掘进机来开挖门洞形断面隧洞一直是世界上主要掘进机生产国研究的课 Full-face tunnelling machines usually can only excavate tunnels with round sections. It has the advantages of quickness and safety, so it is easier to play an advantage in the construction of water diversion tunnels such as water conservancy and power generation. However, in our daily lives and production, we need more tunnels with portal-shaped sections such as railway tunnels, highway tunnels, coal mine lanes, and air defense roadways. For this reason, how to excavate a portal tunnel with an excavation round-section full-face boring machine has always been the study section of the world’s major roadheader producing countries.