Research on Laying Optic-Fiber Cable with Oil (Gas) Pipelines in Large Slope Areas

It has been a prevailing practice of pipeline construction in China and all over the world to lay the optic-fiber cable (silicon-core pipe) same-trench buried with oil (gas) pipeline. At present, the total mileage of optic-fiber cable (silicon-core pipe) laid using this technology has reached 40,000 km in China, among which many pipeline projects go through a lot of mountainous areas and hilly lands, such as:Zhongxian-Wuhan natural gas pipeline, Lanzhou-Chengdu-Chongqing product oil pipeline, and China-Myanmar oil and gas pipelines. The future central Asia gas pipeline line D will also go along a large quantity of mountains and hilly lands. These areas are characterized by complex and up-and-down landforms, large drop height, many steep slopes and limited construction operation, which is a challenge for the stability and reliability of the pipeline and the same-trench buried optic-fiber cable lines. It is a certain threat to the construction and long-term operation. This paper will focus on two kinds of optic-fiber cable-laying methods - direct burial optic-fiber cable and pipeline optic-fiber cable - and build the mechanical model of laying optic-fiber cable in large slope area, study the tension situation of optic-fiber cable in the process of construction and long-term operation, and put forward corresponding protective measures in order to improve the engineering quality of laying same-trench buried optic-fiber cable, which will ensure the long-term reliability of long-term operation of the optic-fiber cable line.