【作者】 张晓飞；

【导师】 李守义；

【作者基本信息】 西安理工大学 ， 水工结构工程， 2004， 硕士

【摘要】 在大体积混凝土结构中，温度应力和温度控制具有重要的意义。碾压混凝土坝与常态混凝土坝相似，同样存在着温度裂缝问题。碾压混凝土坝的温度应力有它不同于常规混凝土坝的特点，必须考虑这些特点，才能得到正确的结论。目前，100m以上的碾压混凝土高拱坝有呈发展的趋势，其温度应力的研究，具有着重要的实际意义。 拱坝体型比较单薄，对外界气温和水温的变化比较敏感，坝内温度变化比较大。除了坝顶为自由边界外，其他三面都受到基岩的约束，温度变形受到的约束比较大，因此在坝体内出现较大的温度应力。所以，必须准确模拟碾压混凝土拱坝的施工过程和材料特性，仿真计算拱坝温度场和应力场，以便采取合理的工程措施，减少坝体的温度应力。 本文采用三维有限元法和热传导理论，研究开发了碾压混凝土拱坝施工期和运行期温度应力场全过程的仿真计算程序。计算中考虑了混凝土的绝热温升、弹性模量、徐变度和自生体积变形随龄期的变化以及分层浇筑、夏季停工、外界气温变化、表面保温、通水冷却及分期蓄水等因素对坝体温度应力场的影响。根据某工程碾压混凝土拱坝施工过程和材料热力学试验参数，进行了施工期和运行期温度场和应力场仿真计算，计算成果与施工期观测资料进行了对比分析，二者吻合较好。本文研究成果可给出坝体的拱冠梁剖面和坝体中心纵剖面的温度等值线图、拱冠梁剖面和坝体上下游面应力等值线图、坝肩最大最小应力沿坝高的分布曲线、不同高程处典型点的最大最小应力值表以及不同高程处最大最小应力值表等成果，为碾压混凝土拱坝的设计和施工中采取相应的温控措施提供了参考依据。更多还原

【Abstract】 Thermal stress and temperature control is crucial in mass concrete structure. Roller compacted concrete dam is similar to concrete dam, and also has temperature cracks. The thermal stress of RCC dam is different from concrete dam’ s, and in order to get correct results, these different characteristics must be considered. At present, the high RCC arch dams above 100m have a tendency to development. Accordingly study on the thermal stress of RCC arch dam has practical importance.Arch dam is slice and it is sensitive to the change of surrounding temperature and water temperature. The change of temperature in the dam is big, and except for the dam crest is free, the other three surfaces are restraint by base rock, and so, the big thermal stress in arch dam probably occurs. Therefore the construction process and material properties of RCC arch dam must be simulated precisely so as to take reasonable engineering measures to reduce the thermal stress in the dam.In this article, according to three-dimension finite element theory and heat conduction theory, the computation program of simulating thermal stress field of RCC arch dam during construction and service is researched and developed. In computation the effect of thermal insulation, elastic modulus, creep degree and autogenous volume change along with age , the progress of pouring by layer, work suspension in summer, the change of air temperature, heat preservation , water cooling, and water storage,by stages on temperature field are considered. Based on the construction schedule and thermodynamics parameters of certainRCC arch dam, the temperature and stress fields during construction and service are simulated and computed, and also the computation results are compared with the practical observation data ; The comparison results show that the computation results are reasonable. The research fruits in this article can provide the temperature isoline map of crown cantilever section and central longitudinal section of the dam, the stress isoline map of crown cantilever section and upstream and downstream surfaces of the dam, the maximal and minimal stress distribution map in dam abutment along with the height of dam, the maximal and minimal stress table of typical nodes and the maximal and minimal stress table in different elevations, and also provide reference basis for taking relative temperature control measures in the design and construction of RCC arch dam.更多还原