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Results of geologic research at straight creek tunnel pilot bore, Colorado
Surface geology ensured good results based on statistical study of surface and drill hole features; successful predictions were made regarding percentages of rock types, linear feet of faulted and sheared rock, and attitudes of foliation and fractures, including faults and joints; predicted rock loads and final swell pressures in gouge and altered rocks agreed well with actual measurements; groundwater flows occurred in expected amounts, but criteria for estimations proved unsound; estimates of amount of temporary support, footage of feeler holes, and amount of grouting required provided engineers with sound basis for estimates of tunnel costs.
Results of geologic research at straight creek tunnel pilot bore, Colorado
Surface geology ensured good results based on statistical study of surface and drill hole features; successful predictions were made regarding percentages of rock types, linear feet of faulted and sheared rock, and attitudes of foliation and fractures, including faults and joints; predicted rock loads and final swell pressures in gouge and altered rocks agreed well with actual measurements; groundwater flows occurred in expected amounts, but criteria for estimations proved unsound; estimates of amount of temporary support, footage of feeler holes, and amount of grouting required provided engineers with sound basis for estimates of tunnel costs.
Results of geologic research at straight creek tunnel pilot bore, Colorado
Nat Research Council -- Highway Research Board -- Research Rec
Robinson, C.S. (author) / Lee, F.T. (author)
1967
11 pages
Article (Journal)
English
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Geologic research at straight creek tunnel site, Colorado
| Engineering Index Backfile | 1964
Measurement on pilot bore for straight creek tunnel
| Engineering Index Backfile | 1966