考虑诱导缝的碾压混凝土重力坝控裂结构温度场与温度应力数值分析

发布时间：2018-10-26 19:24

【摘要】：同常态混凝土坝一样,碾压混凝土重力坝在施工期仍然存在温度应力问题,较大的温度应力会诱发不可控的温度裂缝,而在坝体中设置诱导缝,可使裂缝在已做好防护措施的诱导缝部位产生,以降低不可控温度裂缝的危害。针对碾压混凝土坝的温度裂缝问题,将诱导缝的优势与新研制的高流动防渗抗裂混凝土(High-fluidity Impermeable and Anti-cracking Concrete,HIAC)材料相结合,根据规范要求制定了设有诱导缝的碾压混凝土重力坝控裂结构方案,建立含有裂缝和HIAC的碾压混凝土坝有限元模型,实现了施工期温度场和应力场的仿真计算与分析。基于计算结果,以坝体上游防渗层施工期的主拉应力为指标,从时间和空间两方面对含诱导缝方案进行评价研究,并对控裂结构诱导缝的布置位置和长度进行了优化,从而得到保障应力释放效果、缝长更短以及施工简便的控裂结构方案。
[Abstract]:Just like normal concrete dam, RCC gravity dam still has the problem of temperature stress during construction period. Large temperature stress will induce uncontrollable temperature crack, and the induced joints will be set in the dam body. The cracks can be produced in the induced joints where the protective measures have been made, so as to reduce the harm of uncontrollable temperature cracks. Aiming at the problem of temperature crack in RCC dam, the advantages of induced joint are combined with the newly developed high flow anti-seepage and anti-crack concrete (High-fluidity Impermeable and Anti-cracking Concrete,HIAC) material. According to the requirements of the code, the crack control structure scheme of RCC gravity dam with induced joints is formulated. The finite element model of RCC dam with cracks and HIAC is established, and the simulation calculation and analysis of temperature field and stress field during construction are realized. Based on the calculation results, the main tensile stress of the dam upstream impervious layer during the construction period is taken as the index to evaluate the scheme of the induced joints from the aspects of time and space, and the location and length of the induced joints of the crack control structure are optimized. Thus, the stress release effect, the shorter joint length and the easy construction of the crack control structure are obtained.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家重点基础研究发展(973)计划(2013CB035903) 国家优秀青年科学基金(51622904)
【分类号】：TV544.921

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