Lifelines, such as the power transmission, transportation, and the urban water,heat and gas supply pipeline systems and the like, are fundamental infrastructuresystems to support modern cities' functions and maintain regional economicdevelopment. As a needful component of lifelines, the urban gas supply pipelinesystem plays an important role in industry and daily life. The earthquake-induceddestroy would directly influence the system's function and incur severe secondarydisasters, for example, fi...