Swelling of Rocks in Faults in the Roberts Tunnel, Colorado
Samples of crushed and altered rock associated with faults were collected during the construction of the Roberts tunnel, Colorado, and were tested during a postconstruction study of the geology of the tunnel. The swelling properties and the mineralogy were determined and correlated with rock type and rock alteration. It was concluded that use of such tests at the time of construction could have aided in identifying potentially troublesome ground. Also, such tests, used in conjunction with surface examinations prior to the construction of a tunnel, would have indicated if swelling ground would be encountered during construction, and the order of magnitude of the swelling.
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Engineering Geology Case Histories Number 6
This is the sixth volume in the Case History series of the Division on Engineering Geology of the Geological Society of America, initiated in 1957. Each succeeding volume has enjoyed increasing acceptance as an aid to the practicing geologist and engineer, student, and teacher, alike. This volume is a collection of general case histories on dams, tunnels, highways, and underground construction. Indeed, the Baldwin Hills reservoir failure is another in a long list of cases which demonstrate why the geologic environment, features, and circumstances are of major concern to engineering works.