通过指出2种拱盖法（二衬拱盖法和初支拱盖法）的不足，提出了一种新的拱盖法——叠合初支拱盖法；然后详细阐述了叠合初支拱盖法的施工工序、关键施工技术和施工要点，最后通过比较3种拱盖法，明确了叠合初支拱盖法的优缺点。分析表明，叠合初支拱盖法采用的双层叠合初支整体受力体系，极大提高了拱盖的承载能力；其施工技术关键在于2层初支的良好叠合和大拱脚的加固与保护，以及下断面边墙部的爆破控制。叠合初支拱盖法在很大程度上提高了拱盖法对围岩条件的适应能力，施工更加安全，质量更有保障，使拱盖法可在大范围进行推广应用，但在施工进度和施工工艺上仍需进一步完善、提高。%By pointing out shortcomings of 2 arch-cover methods (secondary lining arch cover method and primary support arch cover method), the paper puts forward a new method —— laminated primary support arch cover method. It also discusses the laminated primary support arch cover method including the construction process, key construction technology and key points of construction. Finally, through the comparison of 3 arch cover methods, it clearly defines advantages and disadvantages of the laminated primary support arch cover method. Analysis shows that double layered primary overall support force system greatly improves the bearing capacity of the arch cover. The key construction techniques in the double layered primary support have a good overlap and the protection and reinforcement of large arch foot, and also good blasting control of the lower section side wall. However it still needs to have a further improvement in the construction progress and process.
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