Simulated Calculation And Analysis On Thermal Stress Of Baise 6Aa Roller Compacted Concrete Gravity Dam Section

That both the structure and material of gravity dams and construction means of earth dams are used in roller compacted concrete dams makes them increasingly used in water engineering. In this paper, temperature field and thermal stress of Baise 6Aa roller compacted concrete gravity dam section are calculated and analyzed, and the distribution laws of the temperature field and the thermal stress field during construction and operation of 6Aa dam section and its foundation whose top is made of F6 fault concrete tuck, are mainly studied.Three-dimension finite element floating mesh method is used to calculate the temperature field and thermal stress of 6Aa roller compacted concrete gravity dam section and F6 fault concrete tuck in this paper. The basic theories adopted include heat conduction theory, elastic theory and corresponding finite element calculation equation. In order to simulate the construction process and the effect of concrete pouring temperature and outside temperature on temperature field and thermal stress field in the dam, temperature field and thermal stress field are calculated layer by layer. The calculation step during construction is 0. 25 day, and during operation the diffusion of hydration heat of concrete is over and elastic modulus is basically stable, changeable step is used. In the initial of operation, calculation step is 0.5 days, and gradually, it reaches 30 days so as to reduce calculation work in the premise of guarantee calculation precision.Because of the complexity of calculation result data, and in order to simplify the analysis of results, this paper only provides annual temperature isoline map of February, May, August and November during construction, temperature isoline map of the first, fifth, tenth, twentieth and thirtieth year during operation, duration curve of temperature and stress of typical point at different elevation, the maximal stress distribution along dam height,point at different elevation, the maximal stress distribution along dam height, and the maximal and minimal temperature and the maximal tensive stress and its position of every month. Through the analysis of above result, the distribution law of the temperature field and thermal stress field of 6Aa dam section and F6 fault concrete tuck can be generally understood, and it provides scientific reference for the structure design and the selection of construction schemes.The results indicate that the thermal stress and comprehensive stress of 6Aa dam section and F6 fault concrete tuck during construction and operation are all within the allowed concrete tensive strength. The results indicate that the construction scheme of 6Aa dam section and the disposal scheme of F6 fault is feasible and meet the need of dam temperature control and crack .prevention.