Characteristics of the thermal stress-state of concrete masses on rock foundations with a complex relief
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The thermal stress-state of concrete masses being constructed on rock foundations with a complex relief can substantially differ from the corresponding state of masses having an almost flat contact with the rock foundation.
The effect of the relief of the rock foundation on the stress-state of the block consists primarily:
in a change in the temperature distribution over the cross sections of the block, which determines internal restraint of individual parts of the block and restraint of the block in the foundation;
in a change in the form of restraint of the mass as a whole in the rock foundation;
in the formation of narrowed or expanded sections in the block, the stresses in which can substantially differ from adjacent ones;
in the formation of stress raisers in the concrete for certain forms of the relief of the rock foundation due to jogs of the contact surface of the block and rock mass.
The relief of the rock foundation can be the cause of occurrence of additional tensile stresses in the cooling concrete masses, leading to cracking in the concrete.
The effect of the relief of the rock foundation on the solidity of the hardening concrete masses should be taken into account when constructing concrete hydraulic structures under harsh climatic conditions at stages of preparing the designs, drawing up technological regulations on performing concreting operations, developing and implementing programs of on-site observations with consideration of the particular climatic, geologic, production, and other construction conditions.
KeywordsRock Mass Rock Slope Concrete Block Rock Foundation Technological Regulation
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