Divine Strake Construction
DIVINE STRAKE related construction at the U16b tunnel site would include an extension of an existing road by about 200 feet (61 m) to reach the location of the ANFO emplacement (or charge) hole, excavation of the ANFO charge hole (including a loading pad and truck turnaround area), instrument bunkers, large diameter (6 inch [15 centimeters (cm)]) core drilling, instrumentation borehole drilling and instrument placement, and grout emplacement for instrumentation holes. Existing laydown yards at the U16b tunnel complex would be used as construction and material staging areas. No major roadway improvements on the NTS are necessary to accommodate truck traffic.
Normal delivery of materials would occur in accordance with existing U16b operations using existing access roads (Pahute Mesa Road and Mid Valley Road). Material delivery during construction would include light fleet traffic of approximately 15 vehicles per day Water would be provided daily by truck for personnel consumption, dust suppression, and construction, as needed Sanitary wastes would be collected in portable toilets, serviced twice weekly Fuel for construction equipment would be delivered bi weekly Delivery of approximately 200 feet (61 m) of concrete pre cast culvert section weighing 12 tons (11 metric tons) each (the concrete culvert would be delivered in 5 foot (1.5 m) sections, with an inside diameter of 12 feet by 12 feet (3.7 m by 3.7 m). Excavation equipment would be delivered by flatbed Normal construction consumables would be delivered as needed.
The two unmanned instrumentation vans would be positioned just outside the Portal 2 entrance and placed inside an instrumentation bunker. The bunker would be made of the pre cast concrete culvert sections described above. The vans would be placed inside their own respective bunker, side by side against the Northeast wing wall. Each bunker would be approximately 75 feet (23 m) in length. Additional overburden (muck) would be placed on top of the bunkers and end caps would be placed just prior to detonation to protect the vans.
To support the modeling and calculation efforts for the proposed detonation , a suite of instrumentation would be placed on and around the test bed. The primary measurements would be made using both free field and near field accelerometers placed in the various instrumentation holes. A small number of sunburst velocity gages would be co located with several free field accelerometers. Relative displacement gages would be installed in the tunnel ribs. Pressure measurements in and around the portals would be made to record the near field environment. Inside the tunnel a number of high speed cameras and radars (vehicle type radar guns) would be installed to assist in determining surface spalling of the tunnel walls resulting from the high explosive detonation. The charge would be measured using the LANL CORRTEX (Continuous Reflectometry for Radius versus Time Experiments) system and a number of Timeof Arrival (TOA) crystals located in the blasting agent itself. To support experiments that may be added to supplement data, additional high speed and video cameras would be positioned to observe test results along with additional pressure measurements in and around the reinforced concrete structure.
The ANFO vendor would have trucks delivering each ingredient to the staging area at an existing laydown yard near Tunnel 16b. Three specially designed bulk delivery trucks (each with a capacity of approximately 24,000 pounds (10,900 kilograms) of raw materials) would be loaded with the raw materials at the staging area and then would transport the materials to the pad adjacent to the charge hole. A fourth bulk delivery truck would be onsite for backup and retrieval of any spilled material. For the estimated 4 to 5 days of ANFO emplacement, there would be daily lines of trucks to bring the materials to batch the ANFO (see Section 2.2.2). The staging area would accommodate the four bulk delivery trucks, one fuel truck, four semi tankers of raw materials, a tool trailer, and a small parts trailer. Because of the potential overlap of deliveries, and deliveries during non loading hours, additional parking for semi trucks and trailers would be provided in a staging area just outside the Mercury gate.
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