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随着社会主义建设的发展,今后我国将修建很多长的越岭隧道、水底隧道和地下铁道。这些隧道往往深埋,地质复杂,承受大的地压和水压,而现有支护衬砌的结构型式和理论已经不能满足要求,需要探讨新的衬砌结构。复合式衬砌是近年来国外采用较多的一种新型衬砌结构,尤其在新奥法和喷锚支护推广以来,西欧、日本、美国和加拿大等国已广泛采用。
With the development of socialist construction, many long cross-country tunnels, underwater tunnels and subway lines will be built in our country in the future. These tunnels are often buried deep, complicated in geological conditions, and subjected to large ground pressure and water pressure. However, the existing structure and theory of supporting linings can not meet the requirements and new lining structures need to be explored. In recent years, the composite lining is a new kind of lining structure which is used more abroad. Especially since the promotion of the New Austrian law and shotcrete and anchor support, it has been widely adopted in Western Europe, Japan, the United States and Canada.