Engineering Geology of Dillon Dam, Spillway Shaft, and Diversion Tunnel, Summit County, Colorado
Published:January 01, 1968
Ernest E. Wahlstrom, V. Q. Hornback, 1968. "Engineering Geology of Dillon Dam, Spillway Shaft, and Diversion Tunnel, Summit County, Colorado", Engineering Geology Case Histories Number 6, George A. Kiersch
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The Dillon Dam, in Summit County, Colorado, is a large earth-fill dam constructed on a foundation of faulted and extensively jointed Mesozoic sedimentary rocks. Appurtenant features include a diversion tunnel and spillway shaft.
Geologic features determined by preliminary exploratory drilling and by detailed studies during construction permitted close control of foundation excavation and grouting operations. Special problems were created by heavy water flows from pervious gravels up to 80 feet deep that covered bedrock in the valley floor of the Blue River, and by repeated movements of an ancient landslide reactivated during dam construction of loading by a temporary earth embankment and simultaneous excavation near the toe of the slide.
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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.