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成都—兰州铁路云屯堡隧道已施工洞段出现多处软岩大变形,严重影响了施工安全及进度。从地层岩性、岩体结构、地应力、地下水等方面对云屯堡隧道软岩大变形特征及地质成因进行了分析。结果表明:该隧道软岩大变形具有总变形量大、变形持续时间长、空间分布不均匀的特征;隧道围岩完整性差、强度低是发生大变形的根本原因,较高地应力和发育的地下水造成强度应力比进一步降低,千枚岩、炭质千枚岩地段易发生轻微~中等大变形。
Abstract：There are large deformations of sof t rock in many sections of Yuntunbao tunnel in Chengdu-Lanzhou railway,which has great impacts on construction safety and progress.The characteristics and geological origin of large deformation were analyzed according to such aspects as stratumlithology,rock mass structure,ground stress and groundwater.The results showthat the sof t rock large deformations of this tunnel have the characteristics of large total deformation, long deformation duration and uneven spatial distribution,t he poor integrity and lowstrength of tunnel surrounding rock are the primary causes of large deformation,the higher ground stress and developing groundwater leads to a further reduction of strength-stress ratio,and the slight to moderate large deformations are more prone to occur in phyllite and carbonaceous phyllite sections.
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基本信息:
中图分类号:U452.11
引用信息:
[1]陈桂虎,韩爱果,陈锦涛.成兰铁路云屯堡隧道软岩大变形特征及地质成因分析[J].铁道建筑,2017,57(10):56-59.
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