Engineering experience indicates that temperature cracking is easy to occur near the height of overwintering layer of RCC dams under the low temperature. More dams are being constructed in China's frigid region, which puts forward higher requirements for temperature control of concrete dams. The laying and dismantling of the traditional external insulation measures on the large warehouse surface will inevitably increase the cost and reduce efficiency in construction. In view of the above problems, a new type of electrically conductive roller compacted concrete (ERCC)is introduced in this paper. The electric temperature increase of large-scale ERCC layer specimen was tested, and the thermal conductivity and specific heat capacity of ERCC was inversed according to the test data. Then, the quantitative calculation model of voltage required to resist the cold wave (U)and the temperature difference inside and outside the dam (Δ T)are deduced according to the heat flow balance. The evolution process of temperature field and stress field of overwintering layer under the action of sudden temperature drop was simulated by the coupling method of electricity-heat-structure. The power supply mode is optimized with the temperature stability of typical measuring points as the objective function. The reliability of the U-Δ T model has been verified by the optimization results. Comparing the temperature, stress and cost of 9 schemes for temperature control, including "thin layer surface protection+ERCC electrified heating" and"conventional insulation materials", the power supply mode has a favorable effect in improving the temperature and stress distribution, which can provide a new way to solve the problem of temperature control of overwintering layer. © 2021, China Water Power Press. All right reserved.
