毛羽山隧道出口大变形影响因素探讨

Discussion on Factors Affecting Large Deformations at Exit of Maoyushan Tunnel

针对在建毛羽山隧道出口发生的大变形情况,对施工控制及变形进行分类,探讨大变形的影响因素,得出高地应力、地质岩性是变形的主要因素,地质构造是变形的次要因素,通过完善施工工艺和提高支护刚度可以有效地抑制变形的发展,保证隧道安全施工。

Considering the large deformations occurred at Maoyushan tunnel exit,construction control and deformations were classified,and the affecting factors for large deformations were discussed.Results indicated that high ground stresses and lithology were the main factors for deformation,while geologic structure was the secondary one.Deformation development can be effectively constrained by improving construction technology and enhancing support stiffness to assure tunnel construction safty.