冀宁输气管道穿越活动断裂的抗震分析与设计

本文采用壳有限元方法分析了输气管道穿越活动断裂的实际变形反应。针对活动断裂两侧场地相异和两侧场地相同以及中间含有破裂带等情况建立了相应的壳有限元分析模型。通过对比冀宁高压输气管道穿越苍尼断裂和沂沭断裂的不同情况,比较了管道在断裂两侧场地相异和两侧场地相同两种情况下的反应。对于断裂场地相异的情况,管道易发生较大的变形,不宜采用现有管道抗震规范中的方法,需建立有限元模型进行分析。虽然管道在断层两侧的变形情况不同,但是管道在两侧的滑动长度却几乎相等。在活动断裂附近建立地震监测和警报系统并采取必要的抗震辅助措施,对保障输气管道的安全运行非常重要。

Seismic Analysis and Design of Ji-Ning Gas Pipeline Crossing Active Faults

The deformation response of Jinin gas pipeline crossing faults is analyzed with Shell FEM.Shell FEM models are set up for pipeline crossing faults with the different soil conditions and the same soil conditions on both sides,as well as the cracked zone in the middle of fault.Different responses of the pipeline are examined when Jinin pipeline crosses Chuangni Fault and Yishu Fault.For the pipe crossing fault with different soil conditions on both sides,The method of the pipe seismic design code is not suitable,so Shell FEM is recommended to analyze the response of pipe.The pipeline usually suffers large deformation and asymmetry on two sides,but the sliding lengths of the pipe are same on both sides.It is very important for the safety of pipe that earthquake monitoring & warning system are build up along the pipeline,and helpful seismic measures are needed.