Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bureau of Reclamation Experience with Instrumented Rolled Earth Fill Dams
This report summarizes the work of Dr. G.P. Gould who studied instrumented performance of Earth Dams during a 3 year stay at the Bureau of Reclamation. Settlement and pore pressures were measured in over 20 earth dams from a period of the 1930s through the 1950s. Detailed measurements were made possible by using multiple cross arm settlement columns and hydraulic pieziometer arrays. Compression records indicated most of the consolidation occurs during construction, and that for soils compacted dry of optimum, most of the compression occurs by reduction of air voids. From the compression data, typical compressions indices were correlated to Unified Soil Classification System soil types. Three phase media theory was used to develop equations to predict pore air and pore water pressure development in compacted soils during compression. Compressible soils compacted wetter than 0.6 % of dry of optimum moisture, exhibited undesirably high pore water pressure increases during construction. On dams where soils were compacted to an average 1.5 to 0.5 % dry of optimum, there were no significant excess pore pressures. This study and several related studies performed during the 1950s at Reclamation constitute some of the most important contributions to dam engineering. By using this information, earth dam designers can confidently design earth dams, and gradually, instrumentation has been reduced in new earth dam construction.
Bureau of Reclamation Experience with Instrumented Rolled Earth Fill Dams
This report summarizes the work of Dr. G.P. Gould who studied instrumented performance of Earth Dams during a 3 year stay at the Bureau of Reclamation. Settlement and pore pressures were measured in over 20 earth dams from a period of the 1930s through the 1950s. Detailed measurements were made possible by using multiple cross arm settlement columns and hydraulic pieziometer arrays. Compression records indicated most of the consolidation occurs during construction, and that for soils compacted dry of optimum, most of the compression occurs by reduction of air voids. From the compression data, typical compressions indices were correlated to Unified Soil Classification System soil types. Three phase media theory was used to develop equations to predict pore air and pore water pressure development in compacted soils during compression. Compressible soils compacted wetter than 0.6 % of dry of optimum moisture, exhibited undesirably high pore water pressure increases during construction. On dams where soils were compacted to an average 1.5 to 0.5 % dry of optimum, there were no significant excess pore pressures. This study and several related studies performed during the 1950s at Reclamation constitute some of the most important contributions to dam engineering. By using this information, earth dam designers can confidently design earth dams, and gradually, instrumentation has been reduced in new earth dam construction.
Bureau of Reclamation Experience with Instrumented Rolled Earth Fill Dams
Farrar, Jeffrey A. (Autor:in)
Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities ; 2000 ; Amherst, Massachusetts, United States
03.04.2000
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Bureau of Reclamation Experience with Instrumented Rolled Earth Fill Dams
| British Library Conference Proceedings | 2000
Pore pressures in rolled fill earth dams
| Engineering Index Backfile | 1953
Selection of materials for rolled-fill earth dams
| Engineering Index Backfile | 1936
Closure to “Lee on Rolled-Fill Earth Dams”
| ASCE | 2021