文档介绍：摘要拱坝一般比较单薄,对外界气温和水温的变化比较敏感,坝内温度变化比较大。由于三面都受到基岩的约束,温度变形时产生比较大的温度应力。工程实践表明,对于高拱坝的陡坡坝段,因为体形较差,温度变形导致的应力集中问题普遍存在。如何有效的解决高拱坝陡坡坝段的温度控制及防裂是工程中迫切需要解决的难题。工程上通常采用结构分缝的措施来释放约束产生的温度应力,本文采取新的结构分缝,改善应力分布,减少应力集中产生的不利影响,结合相应温控措施,达到整个坝体的安全需求。本文阐述了拱坝混凝土温度场和温度应力的有限元计算方法;详细介绍了拱坝裂缝的危害及成因,以及相应的防裂措施。以溪落渡拱坝为研究背景,应用三维温度徐变应力有限元程序,通过坝体不分缝和分缝的对比仿真计算,了解分缝形态和位置对应力集中的削弱效果,论证陡坡坝段采用新的结构分缝的可行性。在采用新的结构分缝的基础上以满足大坝安全需要为前提,对高拱坝陡坡坝段进行必要的温控防裂研究(考虑了跳仓浇筑、混凝土随时间变化的热学、力学参数,冷却水管问距、冷却水温等对温度应力的影响,一期和二期冷却效果等),计算得出的温控措施在实际工程中安全可行,同国内其它工程相比,相对经济、,为拱坝陡坡坝段的安全经济设计和温控防裂提供依据。通过对实际工程中的这种新的结构分缝形式的仿真计算,研究总结出新的结构分缝与温度应力之『自J的关系,揭示其作用机理。采用这种结构分缝,能够简化温控措施, 为解决高拱坝陡坡坝段的应力集中问题寻找到一条新的途径。关键词:高拱坝陡坡坝段应力集中结构分缝仿真计算 Abstract Generally thearchdam ISthinrelatively,which issensitive tothechange ofextemal temperature and water temperature. For thetemperature change in thedam is correspondingly great,temperature deformation will cause quite greattemperature stress because throe sideofthedam was restrictedby practiceindicated that universal thattemperaturedeformation causes stressconcentration inthesteep slope dam sectionsofhilgll archdam because oftheir tocontrol temperature and guard against the crack ofhigh archdam steep slope dam sectioneffectively is adifficult problem which isurgent theproject the measure of structure jointing was usually used toreleasetemperature stressby restrict,through taking a new structure jointing mt捆tsure inthisarticle,stress distribution isimproved and the adverse effect produced by the stressconcentration isreduced,bining withthecorresponding temperature control entire securityrequirements ofthedam bc achieved. T1lisarticle elaborated about the archdam concretetemperature field and the temperature stress,then introduced the crack hazard and theorigination,∞well as corresponding measure guardagainst thecrack theXiLuo—Du archdam as thebacking,applying the three dimensional temperature creep stress finiteelement p