Some results of full-scale observations on the ust-ilim dam during its construction
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The actual strength of the concrete of the Ust-Ilim dam, just as the majority of concretes used in hydraulic engineering, far exceeds the prescribed grade strength due to selecting concrete on the basis of the frost-resistance condition. This circumstance should be taken into account when assiging the grades of concrete and selecting its compositions.
The stressed state in the upstream face of a dam, formed during construction, depends on a multitude of technological factors. The thermal compression of the upstream facerandom and uncontrollable — is not taken into account during design. The data from fullscale observations show that compressive stresses in the upstream face can be created: a) regulating the mutual rate of cooling of the central and peripheral regions of the concrete by means of a certain scheme of laying cooling pipes in combination with heat insulation of the surfaces of the blocks; b) grouting of intercolumn joint I–II at the time of its maximum opening with free thermal rotation of the first column toward the upper pool. The practical use of these methods requires further study both by means of theoretical calculations and by inclusion of a purposeful complex of measurements in the program of full-scale investigations of gravity dams.
The technology of grouting intercolumn joints used on the Ust-Ilim dam provides for their additional opening and being more completely filled with grout. The effectiveness of grouting depends on when it is conducted, which should be determined not only on the basis of the average volume temperature of the blocks bordering the joint but also with consideration of the thermal deformations of adjacent columns. The maximum pressure in the joint which precludes opening of the lower, already grouted parcels should be studied.
KeywordsCompressive Stress Renewable Energy Source Electrical Power Generation Thermal Deformation Technological Factor
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