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Random Testing for Anchor Capacity in Tunnels

Random Testing for Anchor Capacity in Tunnels

Random Testing for Anchor Capacity in Tunnels

(OP)
If the application is within a highway tunnel, such as the the collapse in Boston, what is the accepted failure level within a group of mechanical anchors.

VOD

RE: Random Testing for Anchor Capacity in Tunnels

Generally the number of pull tests that are conducted should be mapped in conjunction with the geologic cross section to determine if it's needed to address a specific area of "bad ground". Going back and retouque testing of any problem areas should be done to detect, map and consider any post excavation changes in Ft-Lb torque on bolts. Bad ground areas need to be measured for any movement before lining & concreting tunnel.

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