Pipeline geological hazard risk

Pipeline Integrity Management Practice of Dealing with Geological Disasters Yan Shengdong, Shen Feijun, China Petroleum West-east Gas Pipeline Company, Zhongwu Pipeline under the jurisdiction of Wuhan Management Office of West-East Gas Pipeline Traverses eastern Chongqing. At the same time, the mountainous areas along the pipeline have abundant rainfall, with an average annual rainfall of about 1500. Such as sichuan gas to east, the railway should million, shanghai-chengdu west highway through the zhong wu pipeline geological disasters are mainly concentrated in zhongxian to appropriate roads, restricted by terrain, and zhong wu pipeline to finish basic same member by landslide, dangerous rock collapse, floods, landslides and other geological disasters construction cause this area in the rock pore water pressure and flowing pressure against threat analysis, This paper introduces the method and process of pipeline integrity management in response to geological disaster, which causes great fluctuation, the original mechanical balance relationship is broken, and the rock formation. The structure is easy to be destroyed, which intensifies the possibility of inducing geological disasters. 1.2 geological disaster risk characteristics along the pipeline geological disaster risk 1 subgroups according to hard rock engineering geological distribution has 1.1 pipeline environment relatively limited, enshi "compass needle field, badong county branch of ping, wild three GuanShi ladder zhong wu zhongxian pipe line up in chongqing, in hubei province Wu Zi, ChangYang County LiuPing eight ridge, such as local exposed. Lithologic hard, Lihan city, the total length of 718km, pipe diameter of 711mm, design pressure 7.0~6.3, high mechanical strength, strong weathering resistance, joint crack is not easy to develop, through MPa, in November 2004 completed and put into production.

The zhongxian - Yichang section of pipeline is not easy to form geological disasters. A total length of 398km, across the eastern Chongqing and western Hubei Wuling mountains. The region distribution more is the surface along the pipeline in hard cutting deep soft rock engineering, ditches and plastic, mountain, physiognomy as carbonates of subgroups, mainly concentrated in zhongxian YueShan, Wang Ying together a group of plateau mountain is given priority to, low mountain valleys of both carbonate and fort, Xiong Jiayan, LiuPing He Jiaping, gaos thought a weir absently. The complex topography and landform of rock dissolution basin lead to frequent geological disasters. The strength of soft and hard is different, the mechanical strength difference is large, soft rock is easy to weathering erosion and mud. Due to the combination of soft and hard rock mass, the heterogeneity and discontinuity are significant, and geological disasters are easy to form in the mountainous areas of eastern Chongqing and western Hubei. 1.3 Analysis of geological Disasters The geological disasters along the Zhongwu Pipeline are most typical, such as landslide, collapse and flood erosion. Since the zhongwu pipeline was put into operation, several special investigations of geological disasters have been carried out in the section from Zhongxian county to Yichang Mountain, and more than 400 geological disasters have been found, including 152 collapses (dangerous rocks), 165 landslides, 61 debris flows and more than 10 floods.