断层破碎带影响下隧道的震害分析

Analysis on Seismic Hazard of Tunnels in Fault Fracture Zone

断层破碎带对隧道震害影响巨大,利用FLAC3D数值计算方法,研究了不同空间方位断层破碎带影响下隧道的地震破坏规律。研究结果表明:含断层破碎带是隧道震害发生的主要影响因素;在相交断层破碎带处,与隧道横断面大角度相交的工况比小角度相交的工况不利,且破坏的部位发生在与断层破碎带相交的位置;在非相交断层破碎带处,倾角为30°的工况最不利,且隧道破坏发生在左边墙肩部和右边墙角部,位于地震波输入的水平和竖直扰动的剪切波和疏密波的合力方向。

Tunnel is influenced significantly by fault fracture zone in earthquake. In this study, FLAC^3D numerical sim- ulation was used to conduct analysis on seismic failure law of tunnel structures in fault fracture zones of different spatial orientation. The results indicate that fault zone is the main factors of seismic hazard in tunnel. At the intersec- tion of fault fracture zone,the project situation that the fault fracture zone intersected with high-angle to the tunnel cross section is worse than the low-angle project situation,and the site of destruction occur in tunnel where the posi lion intersects with the fracture zone. At the place of non-intersect fault fracture zone, the project situation of 30° fault fracture zone is the worst. And the site of destruction occur in the left shoulder and right corner of sidewall and loca- ted in resultant direction of shear and density wave, which disturb by horizontal and vertical seismic wave.