Cautious blast design and monitoring nearby a buried high pressure gas pipeline

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2014

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Dağaşan, Yasin

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Blasting nearby a buried high pressure gas pipeline needs high precision in blast design and careful practice. Although precision of the design is important, simultaneous monitoring plays a crucial role on both controlling the ground vibrations and optimization of the future blasts. Though, there are some other means of measurements, monitoring the blast effects by using blasting seismographs is the most practical method among all the others. In this research, cautious blast design and measurements using blast seismographs were done. The aim of the research is to investigate the applicability of excavation by blasting nearby a buried high-pressure natural gas transmission pipeline and neighboring buildings by utilizing small scale controlled test blast results, to design blast patterns for production blasting for the foundation excavation of a water tank construction and measurement and control of the ground vibrations and airblasts that is caused by production blasting. Within the scope of this study each blast was designed separately and simultaneous monitoring of vibration and air blast were carried out. The distance of the pipeline to the blast area varies from 112.5 m to 200m and the pipeline was the closest structure and relatively the most sensitive one. Other structures around the blast area were the buildings of various kinds. Their distances to the blast area ranged from 650m to 1200m. By utilizing the information obtained from the test blasts, attenuation characteristics of the ground between the pipeline and the blast area were determined and charging & distance table was formed accordingly. By using this table each blast was designed separately and simultaneous monitoring of vibration and air blast were carried out. Vibration levels caused by test and production blasts stayed within the safe limits stated in German DIN4150, Austrian and American standards for blasting nearby pipelines and no damage to the pipeline was reported. As a result of the assessments made, BOTAŞ’s regulation for blasting nearby pipelines was found to be conservative when compared to the standards of other countries and it was concluded that there exists a need for a more reasonable regulation for blasting nearby pipelines in Turkey.

Subject Keywords

Gas pipelines., Underground pipelines., Blasting machines., Blast effect., Excavation.

URI

http://etd.lib.metu.edu.tr/upload/12618198/index.pdf
https://hdl.handle.net/11511/24211

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Y. Dağaşan, “Cautious blast design and monitoring nearby a buried high pressure gas pipeline,” M.S. - Master of Science, Middle East Technical University, 2014.