ROCK ANCHORS â THEN AND NOW - Geosystems, LP

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Sept 2003 Sonic Drilling: Advantages • Can provide continuous, relatively undisturbed cores in soil (75-250 mm diameter) and rock • Very high penetration rates • Readily penetrates obstructions • Depths to 150 m • Can easily convert to other types of drilling • No flush in overburden, minor amounts in rock
Sept 2003 Circulation Type and Application • Up-hole velocity (UHV) > “sinking velocity” • UHV (m/min) = 1274 x Flush Pump Rate (Liters/min) D2 – d2 (mm) where D = drill hole diameter (in mm) d = drill string diameter (in mm) • Typical UHV – Air, or air/water “mist”: 1500 m/s (max 2100 m/s – Water: 36 m/s (max 120 m/s) – Low to medium viscosity mud: 30 m/s – Very thick mud: 18 m/s – Foam: 12 m/s
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: Rock Drilling Methods 1. Rotary Sep
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

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

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ROCK ANCHORS â THEN AND NOW - Geosystems, LP