ROCK ANCHORS â THEN AND NOW - Geosystems, LP

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Sept 2003 GEOSYSTEMS, L.P (724) 942-0570 1. Background 2. Geotechnical Design 3. Construction 3.1 Drilling 3.2 Water Pressure Testing 3.3 Grouting 3.4 Tendon 4. Stressing and Testing 5. As-Built Records 6. Overview
Sept 2003 1. Background • Large dam, Pacific Northwest • 142 vertical anchors installed in 1975, to resist sliding • “Button head” wire tendons, total length 55 to 168 feet. • Design Working Load 205 to 1490 kips • Long term performance monitored via 4-wire 4 “minitendons” • Original records available, permitting comparison with current PTI (1996) Recommendations
Page 1: Sept 2003 GEOSYSTEMS, L.P (724) 942
Page 5 and 6: Sept 2003 GEOSYSTEMS, L.P. Now: Exa
Page 7 and 8: Normal Anchor Design ASSUMPTION Str
Page 9 and 10: Sept 2003 1 (f eff) EFFICIENCY FACT
Page 11 and 12: Normal 10 m anchor capacity vs. 10
Page 13 and 14: Sept 2003 3.1 Drilling Then: • Di
Page 15 and 16: Rock Drilling Methods 1. Rotary Sep
Page 17 and 18: Sept 2003 Circulation Type and Appl
Page 19 and 20: Sept 2003 Circulation Type and Appl
Page 21 and 22: Table 2. Summary of recorded drill
Page 23 and 24: Sept 2003 Recording of Drilling Pro
Page 25 and 26: Sept 2003 3.2 Water Pressure Testin
Page 27 and 28: Sept 2003 3.3 Grouting Then: • Pr
Page 29 and 30: Sept 2003 Trial Mixes • Cement se
Page 31 and 32: Sept 2003 3.4 Tendon Then: • Cont
Page 33 and 34: How to provide the needed Corrosion
Page 35 and 36: Corrosion Protection Decision Tree
Page 37 and 38: Sept 2003 4. Stressing and Testing
Page 39 and 40: Anchor Tests - General 1. Pre-produ
Page 41 and 42: Graphical Analysis of Performance T
Page 43 and 44: Graphical Analysis of Proof Test Da
Page 45 and 46: Special Considerations for Epoxy Co
Page 47: Sept 2003 6. Overview THEN NOW Geot

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ROCK ANCHORS â THEN AND NOW - Geosystems, LP