ROCK ANCHORS â THEN AND NOW - Geosystems, LP

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Sept 2003 5. As Built Records Then: • Focus on drilling logs via cores • Grout strength data (cubes) • Load-extension data Now: Much enhanced, e.g., • MWD • Fluid grout tests • Stressing data • [Computers help]
Sept 2003 6. Overview <strong>THEN</strong> <strong>NOW</strong> Geotechnical design Same – equally conservative Construction • Drilling • Water pressure testing • Grouting • Tendon Stressing and Testing Investigation Production Better material knowledge As-Built Records Equally good, but quality reflects construction process
Page 1 and 2: Sept 2003 GEOSYSTEMS, L.P (724) 942
Page 3 and 4: Sept 2003 1. Background • Large d
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: Special Considerations for Epoxy Co

ROCK ANCHORS â THEN AND NOW - Geosystems, LP

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ROCK ANCHORS â THEN AND NOW - Geosystems, LP