PROJECT DETAILS
The Atoka Shaft Project in Ada, OK was a critical piece of infrastructure necessary to feed southeast Oklahoma City from the Atoka Reservoir. Two shafts thirty-one feet in diameter were line drilled full depth, blasted, and excavated down to a depth of one hundred and seventy-six feet. Four starter portals were blasted for the tunnel boring machines (TBM) which allowed them to work in both directions. Starting seventy-two feet into the ground we blasted our first eleven feet layer of limestone in the vertical shaft forty feet from an existing above ground waterline.
In coordination with Cathy Aimone-Martin and Associates, we conducted displacement, strain, and seismic monitoring and analysis. A 0.5 in/sec PPV was recorded at the concrete abutment well below the theorized design with a restriction of 3 in/sec PPV. Blasting was completed in the west shaft allowing for TBM operations to begin while the remainder of the east shaft was blasted. Fourteen shots in total were completed through conglomerate, shale, and limestone to allow for nearly two miles of TBM operations to continue unimpeded.
