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公路隧道开挖应力变化及锚杆受力影响研究
(1浙江大学城市学院土木工程系，杭州 310015；2浙江大学建筑工程学院，杭州 310027)
Effects of Highway Tunnel Excavation on Stress Variation and the Force Applied on Anchor Bolts
(1 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 2 College of Civil Engineering and Architecture, Zhejiang University 310027)
Abstract：
Based on the 1# tunnel project on the S13 highway, the variation law of stress and internal force in the anchor bolt is analyzed by a numerical simulation method in respect to buried depths, rock mass grades, and excavation methods, and a comparison is made with the testing data. The results indicate that the initial stress of the rocks around the tunnel is released during tunnel excavation, resulting in rock mass deformation and stress redistribution, while the stress varies with the advancement of the excavation face. The variation rules of the stress state of the crown (A), haunch (B), and invert (C) at the tunnel portal and mid-section are inconsistent. There are different effects on the internal force of the anchor bolts and tunnel areas based on different excavation methods, rock mass grades, and buried depths. The largest stress applied on the rock bolt is mainly concentrated on the crown and the areas nearby for surrounding rock of grade III, while it is mainly concentrated on the two sides of the arch springing for surrounding rock of grade IV or V. At a buried depth of 60 m or 100 m, the maximum axial force acting on the rock bolt occurs at the both sides of the tunnel invert, while it occurs at the left area of the tunnel crown at a buried depth increasing to 140 m. These research results provide a reference for the design and construction of similar tunnels, and encourage a more reasonable primary support and secondary lining.
2013, Vol. 50 