Numerical Modeling of Subsidence-Induced Stress on the Pipeline in Steep Seam Mining

Guo Ming Cheng; Tong Zu Liu; Bin Zhi

doi:10.4028/www.scientific.net/AMM.448-453.3863

Paper Titles

A Numerical Study of Flow Field in a Hydrocyclone for Potash Ore Desliming
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Strategies for Improving Effectively the Grade of a Siliceous-Calcareous Phosphate Ore
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Flotation Behavior Difference between the Pure Quartz and the Quartz Gangue of a Siliceous-Calcareous Phosphate Ore with Fine Size
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Deep Mining Optimization of Rock Burst Mines
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Numerical Modeling of Subsidence-Induced Stress on the Pipeline in Steep Seam Mining
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An Experimental Study on Destructive Nature of Seam Roof Strata with Horizontal Bedding
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Study on the Coefficient of Surface Subsidence by Mining on the Condition of Thick Unconsolidated Layers and Thin Stratum
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Study on the Response of Surrounding Rock for Gob-Side Entry Retaining under the Mining
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UDEC Numerical Simulation Research of Mining Overlying Strata Movement Regulation
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Numerical Modeling of Subsidence-Induced Stress on the Pipeline in Steep Seam Mining

Abstract:

In China, surface subsidence caused by steep coal seam mining has affected the safe operation of pipelines in recent years. The study site is one coal mine, where the gas pipeline from Shanshan to Urumqi is across. FLAC^3Dwas adopted to study subsidence-induced stress on the pipeline, and the numerical model was calibrated with the measurement data. Visualization of alarm levels on the pipeline was obtained by integrating the usage of Fish function embedded in FLAC^3Dand Tecplot. The simulations reveal that the stress on the pipeline is closely related to the excavation depth. The stress on the pipeline increases with the excavation depth increasing when mining the 1st, 2nd, and 3rd levels, whereas the stress on the pipeline decreases slightly with the excavation depth increasing when mining the fourth, fifth, and sixth levels. The maximum stress on the pipeline occurs after mining the 3rd level. The possible damage to the pipe is at the upper-right side. Therefore, the results are helpful to prevent and reduce the impact of subsidence on the pipeline.