护拱 meaning in English

back haunch fillet of arch
haunching
umber

Concerning the construction of the shallow cover and the special shallow cover in the tunnel under the special geology conditions , the principle of " to stabilize the slopes with protecting arch ; to strengthen the earth with the pipe - shield support grouting ; to dig a hole shallowly ; to blast slightly ; to use strong supporting structure . " has been adopted to enter the tunnel safely ; in terms of the broken belt , the effective actions such as the pipe - shield support grouting , strengthening the surrounding rock in advance with advanced bolt and steel grids , and so on , are taken to pass the poor conditioned part smoothly
对于特殊地质中的浅理、特浅埋进洞的施工，坚持“护拱稳定边仰坡，大管棚注浆加固土体，浅打眼、弱爆破、强支护”的原则，做到安全进洞；对于断层破碎带，则采取了管棚注浆，超前锚杆预先加固围岩并结合钢格栅支撑等有力措施，顺利通过了不良地段。