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Reconsideration of failure initiating mechanisms for Teton Dam
27A
Dams and embankments See also." 861093, 861110, 861131, 861163, 861165
861212 A55 North Wales Coast Road stage 1 - Llanddulas to Gian Conwy Springett, M Highways Transp V32, N5, May 1985, P3-11 Geotechnical problems arising during the construction of an I lkm section of the A55 are described. Of particular interest are the use of an armoured embankment below the waterline in an area where unstable clay cliffs overlie a limestone shoreline and a shell piled concrete raft carrying a lightweight concrete embankment where ground conditions were soft alluvium with significant amounts of peat.
861213 Waterproof element for embankment dams Penman, A D M Int Water Power Dam Constr 1/37, N7, July 1985, P3348,112 A small amount of water will seep through or round all dams. The waterproof element is designed to limit the flow so material will not be carried away and porewater pressures do not exceed design assumptions. The techniques used over the years to construct waterproof elements for embankment dams are reviewed. Amongst topics covered are homogeneous dams,central clay cores, core walls of asphalt or concrete, upstream membranes and grout curtains or diaphragm walls for below-ground cutoffs. 42 refs.
861214 Reconsideration of failure initiating mechanisms for Teton Dam Leonards, G A; Davidson, L W Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P1-12. Publ Essen." German Society for Soil Mechanics and Foundation Engineering, 1985 The Teton Dam was breached before the reservoir level reached the spillway sill on first filling in 1976. The original reports on the failure have been re-examined and proposed failure mechanisms reviewed. A failure mechanism is proposed which satisfies the accumulated data and can be supported by laboratory testing. Lessons to be learned are listed.
861215 Erosion in dam foundations of 'Buntsandstein' (In German) Wittke, W Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P165-176. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 A 10m high earth dam of weathered buntsandstein (variegated sandstone) failed on its third trial impoundment. It was constructed with weathered buntsandstein and quaternary gravel, underlain by unweathered highly permeable buntsandstein, beneath the dam bearing surface. Extensive site and rock mechanical investigations were undertaken at the planning stage and after failure. Possible failure mechanisms are examined on the basis of this information plus that gathered during impoundment. It is established that erosion in the area of a previously undiscovered fault below the bearing surface was the cause of failure.
861216 Foundallon and subgrade sealing for two dams resting on quartzite a-nd diorite (Burma) Kutzner, C Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P177-181. Publ Essen. German Society for Soil Mechanics and Foundation Engineering, 1985 Subgrade sealing is necessary if expected seepage adversely affects economy of reservoir operation or creates a risk of erosion of joint fillings and subsequent piping and danger of dam failure. A project in Burma included a main dam of 76m height and a lateral dam of 45m height founded on quartzite and diorite respectively. Following site measurements of permeability and laboratory tests to examine erodability of joint filling materials, a grout curtain was installed in the main dam foundations, in line with conservative criteria commonly used for dams over 50m high. No grouting was used for the lower dam, although a 5m deep key trench was executed below the centre of the core. The lack of hard and fast criteria to decide whether foundation treatment is necessary is commented on.
861217 Measurements of stresses and deformations near the foundation of the Schlegeis concrete arch dam (In German) Widmann, R Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P183-188. Publ Essen: German Socieo' for Soil Mechanics and Foundation Engineering, 1985 The installation of a complex monitoring system in the 131m high Schlegeis arch dam, Germany, allowed the stresses and strains to be monitored during operation of the reservoir. This enabled the causes of seepage below the dam to be easily identified and remedial measures were taken.
861218 Foundation of concrete dams in narrow gorges (In German) Gilg, B Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P189-193. Publ Essen: German Socieo' for Soil Mechanics and Foundation Engineering, 1985 Foundation problems for dams in narrow gorges are discussed with particular reference to slope stability and rock improvement. Three case studies are introduced. The first is of a buttress dam in a sedimentary rock valley, the second is of foundation treatment for an arch dam on crystalline rock and the third is of a narrow gorge in a highly seismic region.
861219 Keynote address towards successful waterworks Stapledon, D H Proc of the Symposium on Engineering for Dams and Canals, Aiexandra, 24-27 Nov 1983 V9, N4, P1.3-1.16. Publ New Zealand." Inst Prof Engr New Zealand, 1983 A discussion of factors which contribute to failures is presented, followed by recommendations for a successful approach. It concentrates on dams and reservoirs, although the principles should be applicable to all waterworks.
861220 Hydrological studies Jowett, I G; McKerchar, A I
Proc of the Symposium on Engineering for Dams and Canals, Aiexandra, 24-27 Nov 1983 V9, N4, P3.1-3.10. Publ New Zealand." lnst Prof Engr New Zealand, 1983 Brief summary of hydrological data collection and checking. The standards used in design, and the principal methods by which design-flood size and design-flood hydrograph shape are estimated are noted. The dampening effect of reservoir storage on flood hydrographs, flood sizes to be expected with
Dams and embankments See also." 861093, 861110, 861131, 861163, 861165
861212 A55 North Wales Coast Road stage 1 - Llanddulas to Gian Conwy Springett, M Highways Transp V32, N5, May 1985, P3-11 Geotechnical problems arising during the construction of an I lkm section of the A55 are described. Of particular interest are the use of an armoured embankment below the waterline in an area where unstable clay cliffs overlie a limestone shoreline and a shell piled concrete raft carrying a lightweight concrete embankment where ground conditions were soft alluvium with significant amounts of peat.
861213 Waterproof element for embankment dams Penman, A D M Int Water Power Dam Constr 1/37, N7, July 1985, P3348,112 A small amount of water will seep through or round all dams. The waterproof element is designed to limit the flow so material will not be carried away and porewater pressures do not exceed design assumptions. The techniques used over the years to construct waterproof elements for embankment dams are reviewed. Amongst topics covered are homogeneous dams,central clay cores, core walls of asphalt or concrete, upstream membranes and grout curtains or diaphragm walls for below-ground cutoffs. 42 refs.
861214 Reconsideration of failure initiating mechanisms for Teton Dam Leonards, G A; Davidson, L W Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P1-12. Publ Essen." German Society for Soil Mechanics and Foundation Engineering, 1985 The Teton Dam was breached before the reservoir level reached the spillway sill on first filling in 1976. The original reports on the failure have been re-examined and proposed failure mechanisms reviewed. A failure mechanism is proposed which satisfies the accumulated data and can be supported by laboratory testing. Lessons to be learned are listed.
861215 Erosion in dam foundations of 'Buntsandstein' (In German) Wittke, W Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P165-176. Publ Essen: German Society for Soil Mechanics and Foundation Engineering, 1985 A 10m high earth dam of weathered buntsandstein (variegated sandstone) failed on its third trial impoundment. It was constructed with weathered buntsandstein and quaternary gravel, underlain by unweathered highly permeable buntsandstein, beneath the dam bearing surface. Extensive site and rock mechanical investigations were undertaken at the planning stage and after failure. Possible failure mechanisms are examined on the basis of this information plus that gathered during impoundment. It is established that erosion in the area of a previously undiscovered fault below the bearing surface was the cause of failure.
861216 Foundallon and subgrade sealing for two dams resting on quartzite a-nd diorite (Burma) Kutzner, C Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P177-181. Publ Essen. German Society for Soil Mechanics and Foundation Engineering, 1985 Subgrade sealing is necessary if expected seepage adversely affects economy of reservoir operation or creates a risk of erosion of joint fillings and subsequent piping and danger of dam failure. A project in Burma included a main dam of 76m height and a lateral dam of 45m height founded on quartzite and diorite respectively. Following site measurements of permeability and laboratory tests to examine erodability of joint filling materials, a grout curtain was installed in the main dam foundations, in line with conservative criteria commonly used for dams over 50m high. No grouting was used for the lower dam, although a 5m deep key trench was executed below the centre of the core. The lack of hard and fast criteria to decide whether foundation treatment is necessary is commented on.
861217 Measurements of stresses and deformations near the foundation of the Schlegeis concrete arch dam (In German) Widmann, R Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P183-188. Publ Essen: German Socieo' for Soil Mechanics and Foundation Engineering, 1985 The installation of a complex monitoring system in the 131m high Schlegeis arch dam, Germany, allowed the stresses and strains to be monitored during operation of the reservoir. This enabled the causes of seepage below the dam to be easily identified and remedial measures were taken.
861218 Foundation of concrete dams in narrow gorges (In German) Gilg, B Proc 6th National Rock Mechanics Symposium, Aachen, 3-4 April 1985 P189-193. Publ Essen: German Socieo' for Soil Mechanics and Foundation Engineering, 1985 Foundation problems for dams in narrow gorges are discussed with particular reference to slope stability and rock improvement. Three case studies are introduced. The first is of a buttress dam in a sedimentary rock valley, the second is of foundation treatment for an arch dam on crystalline rock and the third is of a narrow gorge in a highly seismic region.
861219 Keynote address towards successful waterworks Stapledon, D H Proc of the Symposium on Engineering for Dams and Canals, Aiexandra, 24-27 Nov 1983 V9, N4, P1.3-1.16. Publ New Zealand." Inst Prof Engr New Zealand, 1983 A discussion of factors which contribute to failures is presented, followed by recommendations for a successful approach. It concentrates on dams and reservoirs, although the principles should be applicable to all waterworks.
861220 Hydrological studies Jowett, I G; McKerchar, A I
Proc of the Symposium on Engineering for Dams and Canals, Aiexandra, 24-27 Nov 1983 V9, N4, P3.1-3.10. Publ New Zealand." lnst Prof Engr New Zealand, 1983 Brief summary of hydrological data collection and checking. The standards used in design, and the principal methods by which design-flood size and design-flood hydrograph shape are estimated are noted. The dampening effect of reservoir storage on flood hydrographs, flood sizes to be expected with