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Extremely Controlled Rock Blasting Near Critical Pipes Where Mechanical Excavation Is Not Practical
There are cases where excavations in hard rock must occur very close to existing pipes that must remain in operation. These cases include new gas or water pipes in existing Rights-of-way (ROW) where separation between new excavation trenches and existing pipes is very limited. In other instances, hard rock or mass concrete must be excavated to install new pipes or other facility upgrades near critical utility pipes or operating penstocks at hydroelectric plants. In these cases where excavations in hard rock must occur very close to existing pipes, the use of blasting methods is not possible when standard vibration criteria or restrictions based on pseudo-theoretical calculations are applied to the work. However, mechanical methods are often impractical when the rock is too hard, volume of rock is too large, or excavation geometries prevent their use. This paper focuses on systematic methods that can be used to develop customized blasting programs based on existing pipe(s) condition, strain failure modes, ground characteristics, and close-in blasting experience. The application of these methods is demonstrated in two case-history summaries including blasted rock excavations located within 1 m of steel penstock pipes and 2.4 m from steel water mains.
Extremely Controlled Rock Blasting Near Critical Pipes Where Mechanical Excavation Is Not Practical
There are cases where excavations in hard rock must occur very close to existing pipes that must remain in operation. These cases include new gas or water pipes in existing Rights-of-way (ROW) where separation between new excavation trenches and existing pipes is very limited. In other instances, hard rock or mass concrete must be excavated to install new pipes or other facility upgrades near critical utility pipes or operating penstocks at hydroelectric plants. In these cases where excavations in hard rock must occur very close to existing pipes, the use of blasting methods is not possible when standard vibration criteria or restrictions based on pseudo-theoretical calculations are applied to the work. However, mechanical methods are often impractical when the rock is too hard, volume of rock is too large, or excavation geometries prevent their use. This paper focuses on systematic methods that can be used to develop customized blasting programs based on existing pipe(s) condition, strain failure modes, ground characteristics, and close-in blasting experience. The application of these methods is demonstrated in two case-history summaries including blasted rock excavations located within 1 m of steel penstock pipes and 2.4 m from steel water mains.
Extremely Controlled Rock Blasting Near Critical Pipes Where Mechanical Excavation Is Not Practical
Revey, Gordon F. (author)
Pipelines 2015 ; 2015 ; Baltimore, Maryland
Pipelines 2015 ; 594-605
2015-08-17
Conference paper
Electronic Resource
English
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