【摘要】 采用大型振动台对强震区山岭隧道结构进行了模型试验研究,分析了隧道洞口段和洞身段结构及模型土的破坏形态,试验结果表明:在隧道洞口仰坡裂缝首先出现于拱腰,表层模型土裂缝呈"X"形分布;设置减震层对吸收地震波能量、减少岩土体与结构的裂缝数量效果明显;在隧道洞身段拱顶衬砌内缘出现拉裂性裂缝,边墙中部衬砌外缘出现拉裂性裂缝,仰拱与边墙交接处出现剪裂性裂缝,仰拱中部出现压裂性裂缝;在隧道洞身段进出口裂缝数量较多,但多数裂缝延伸至环向裂缝后终止,建议在破碎带附近设置一定数量的减震缝。更多还原

【Abstract】 The model test is accomplished to a mountain tunnel structure in high-intensity earthquake area by the large-scale shaking table model,and the failure modes of the tunnel portal and body and model soil are analyzed.The results show that the cracks of the tunnel slope appear firstly at both tunnel hances and the cracks arise a "X"-shape distribution on the surface of the model soil;it is effective that the shock absorption layer can absorb seismic energy and reduce the number of cracks for the tunnel structure and the rock and soil;there is a tensile fracture at the inner edge of the tunnel vault or at the outer edge of both tunnel side-walls,while there is a shear fracture at the junction of the invert and side-wall and a compressive fracture with dislocation arise at the middle of the tunnel invert.There are a lot of cracks terminated after extending to the ring cracks at the body tunnel and a number of deformation joints are proposed near the broken belt.更多还原