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Hydraulic Fracture Study at Tiber Cofferdam
Within embankment dams and their foundations, hydraulic fracturing can occur during grouting operations; during drilling for grouting, sampling, or instrumentation; or during reservoir filling. Although numerous such occurrences had been reported and documented, they were generally thought to be unrelated to embankment failure until the Independent Panel's report on the failure of Teton Dam listed hydraulic fracturing as a possible contributor to cracking within the embankment. The scheduled removal of a cofferdam constructed to facilitate spillway rehabilitation at Tiber Dam, Montana, presented a unique opportunity to safety induce hydraulic fracturing in a compacted earth embankment. Water was injected into 18 holes, and the pressures required both to initiate rupturing and to allow closure of the fracture were measured. Refracturing tests were conducted shortly after the initial fracturing and again approximately 8 months later. Pressuremeter, stress captor, and mechanical cone penetrometer tests were also performed. During excavation of the cofferdam, the fracture patterns were mapped, inplace densities determined, and samples of the material obtained.
Hydraulic Fracture Study at Tiber Cofferdam
Within embankment dams and their foundations, hydraulic fracturing can occur during grouting operations; during drilling for grouting, sampling, or instrumentation; or during reservoir filling. Although numerous such occurrences had been reported and documented, they were generally thought to be unrelated to embankment failure until the Independent Panel's report on the failure of Teton Dam listed hydraulic fracturing as a possible contributor to cracking within the embankment. The scheduled removal of a cofferdam constructed to facilitate spillway rehabilitation at Tiber Dam, Montana, presented a unique opportunity to safety induce hydraulic fracturing in a compacted earth embankment. Water was injected into 18 holes, and the pressures required both to initiate rupturing and to allow closure of the fracture were measured. Refracturing tests were conducted shortly after the initial fracturing and again approximately 8 months later. Pressuremeter, stress captor, and mechanical cone penetrometer tests were also performed. During excavation of the cofferdam, the fracture patterns were mapped, inplace densities determined, and samples of the material obtained.
Hydraulic Fracture Study at Tiber Cofferdam
T. R. Strauss (author)
1987
481 pages
Report
No indication
English
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