The related factors of ground movement and deformation was analyzed in coal mining, geological conditions, Analytic Hierarchy Process to establish a mining methods, mining subsidence formation time, covered lithology, mining depth and thickness ratio, horizontal deformation, curvature radius, inclination, and subsidence value of the gob as the main indicator of the type of evaluation system based on evaluation system divided into different risk levels, and to take appropriate measures to deal with different risk levels. Combined with Second West-East Gas Pipeline Ningshan branch instantiated demonstration showed Hengfa Mined subsidence gas pipeline risk assessment results coincide with the actual impact of the case, to prove that this evaluation method has great practical application guidance. In recent years, with the large demand for natural gas, as well as the urgent need for environmental protection, Chinese natural gas pipeline project has entered a peak period,. due to the natural gas pipeline extending too long, it inevitably through the widely distributed mine gob. Surface movement and deformation lead to build a gas pipeline or in-service pipeline protection bring special difficulties. Research on gas pipeline risk assessment in Mined subsidence, not only for ensuring gas pipeline in the design life of the security operations has important theoretical significance, but also for the future of how gas pipelines high safely low costs through gob subsidence, full use underground mineral resources are of universal significance. Chinese energy industry is developing rapidly, but very uneven distribution of energy, West-East gas transmission to improve the situation of promote the environment and for the adjustment of Chinese energy structure has great significance. West-East mainline west from Xinjiang, passing through Gansu, Ningxia, Shaanxi, Shanxi, Henan, Anhui, Jiangsu to Shanghai, many of which provinces are along Chinese coal mining bases[1].
