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炭质页岩在我国滇西地区分布较广,由粘土矿物及有机质组成,泥质结构,薄层状构造,岩性软弱,易风化成碎片,与水作用易于软化崩解而丧失稳定性,大丽线松桂一号隧道穿越的主要地层就是炭质页岩,在施工过程中,隧道支护结构多次发生变形侵限,最大变形达120cm,给施工带来了极大的困难,目前,对于该类隧道的施工技术还无现成的技术标准可遵循。因此,开展该类问题的研究,一方面通过研究炭质页岩隧道的变形机理,提出适合松桂一号隧道可行的施工技术;另一方面也可为类似隧道工程的设计和施工提供科学依据。
Carbonaceous shale is widely distributed in West Yunnan, China. It is composed of clay minerals and organic matter, and is characterized by argillaceous structure and thin layer structure. The lithology is weak and easily weathered into fragments, which can soften and disintegrate with water and lose stability. During the construction process, the supporting structure of the tunnel has been subjected to multiple deformations and deformations with the maximum deformation of 120 cm, which brings great difficulties to the construction. At present, the main strata crossing the Songgui-1 tunnel in Dali Line is carbonaceous shale. , There is no ready-made technical standard for the construction technology of such tunnels to follow. Therefore, to carry out the research on this kind of problems, on the one hand, through the study of the deformation mechanism of carbonaceous shale tunnels, put forward feasible construction technology suitable for Songgui-1 tunnel; on the other hand, it can provide scientific basis for the design and construction of similar tunneling projects .