rock blasting resources
rock blasting resources
(OP)
I am designing a water distribution pipeline in an area where bedrock is very shallow and will require blasting for installation of the pipeline below frostline (approx 4 feet below grade). Hardness of the rock has not been determined yet. Neighboring residents have complained of problems with blasting that has previously taken place. I am looking for any general tips or resources that can help me select a blasting method that will minimize disturbance to residents and perhaps assist in developing a health and safety plan.





RE: rock blasting resources
Use high-brisance blasting agents, well-tamped, and completely filling the hole diameter,with good pea gravel stemming to maximize coupling and maximize high-frequency vibrations.
If there is clay over the rock, go to www.ime.org and see their advice about carbon monoxide subsurface migration. Use an oxygen balanced blasting agent.
Good luck, but expect lawsuits anyway as blasting is "an inherently dangerous act" and the blaster must prove himself innocent.
RE: rock blasting resources
Watch location of magazines, or that all explosives are in appropriate transportable magazines. Expect visits from your, or the contractor's insurance agent and potentially OSHA. Be particularly vigilant with inspection of the installation, the residents will get only more miffed if you have to go back in for a bad joint during a hydro-test as they were when you were doing the original blasting. Blast appropriately, enough, but no too much so you minimize need for excessive amounts of imported select backfill. Pay the Contractor to designated (specified)Pay Lines to avoid him from overblasting. Make the select replacement material part of the removal item, if it's not too late,that'll help keep him honest.
Good Luck
R.A. Hassett, P.E.
RE: rock blasting resources
Chuck
cgopperton@stantec.com
http://www.stantec.com/