Application of pipeline integrity management technology

On October 5, 2017, the stress monitoring data at 018km+299m of Zhongwu pipeline showed abnormal, exceeding 60% of the allowable value and issuing a yellow warning. According to the analysis of pipeline integrity management system based on GIS, the pipeline here crosses the green slope behind the 302 provincial highway and crosses the landslide. There are 11 households in the potential impact radius, and the landslide is located between two gullies. Through the exploration and analysis, a thought influenced by continuous heavy rains, increases in pipeline crossing the slope groundwater flow, slide body clay gravel filling water more severe, especially 302 provincial highway drainage due to landslides blocked, lead to the segment above road rain water directly into the landslide, the soil is in a state of full water for a long time, the mechanical strength is reduced, soil sliding. The landslide is composed of slope deposit and colluvial slope deposit, which is a soil landslide. The leading edge of the landslide is the 302 dart, and the crack is accompanied by "smoking" phenomenon, which is a typical cleaning, or a combination of the two, which is a sign of dangerous sliding of small volume and broken into blocks. The plane of the landslide body is irregular arc, and the sliding direction is about the direct removal of rock. For the large volume, support measures are taken. The east side is bounded by provincial highway 302, and the west side is at the foot of the slope. If the terrain is large and the dangerous rock mass is broken into blocks, it can be cleared first and then supported. The specific measure body is slow up and steep down, with a slope of about 35 ". The landslide is about 70m long from north to south.

There are: (1) there is a cavity of dangerous rock, and the volume is not large, directly set the support width of about 80m, the area of about 0.5×10'm2, the thickness of 20~5.0m, the volume of the column, resist the amount of dangerous rock period, control 6 dangerous rock. ② The dangerous rock footing is about 1.9×10 × m2. The buried depth of pipeline is 0.8~2.0m. Severe weathering, reinforced concrete or mortar masonry structure foot guard, stability calculation results show that the landslide weight + surface load to continue weathering, treatment of 9. (3) The volume of the dangerous rock is less than 500m2, and the stability coefficient is 1.003-1.079 under the condition of a rainstorm in consecutive +50 years, and 10 of them are treated by the qing method. (4) The volume of the dangerous rock is between 500 and 1000m2, and the relative capacity is in an understable or basically stable state. In order to ensure the safety of the pipeline, it should be easy to be broken. (5) Emergency rescue measures are taken at the bottom of the presser foot, the top of the joint filling and drainage, to ensure the integrity of the rock, medium volume, the use of wrong rod treatment 6. 6 finished pipes temporary security, dangerous rock is demonstrated, permanent measures, landslide is large (more than 1000 m), using the prestressed anchor cable fault overall safety coefficient increase to 1.15, take the top of the landslide and central solid governance 4 set to play in the drainage, part 11 root pile retaining wall of the bottom, (2) the passive protection of direct pipeline protection, The safety factor can be increased to the predetermined value by setting the reinforced concrete engineering treatment measures above the pipeline. Hard cover or set up stone block net, falling trough, control three dangerous rock mass. 2.2 Risk Analysis and Preventive Measures of Geological Disasters of Typical Dangerous Rock Collapse Zhangjiagou dangerous rock (group) is located at the source of Zhangjiagou slope (3) in Shizhu County, and the dangerous rock is developed in the upper Shaximiao group group of middle Zhuluo system.