中文摘要：

针对干热河谷高温季节筑坝层间歇期间存在的裂缝问题,结合现场进行的温度梯度实验,采用精细模型及有限元仿真方法,反馈分析浇筑层间歇期间表层混凝土温度梯度变化及分布规律,由此获取真实温度梯度条件下混凝土内部温度应力的发展及变化过程,并弄清类似应力状态条件下混凝土层面可能的开裂隐患及裂缝出现的内在机理,最后探讨有效预防此类开裂风险的温控措施与方法,为干热河谷高温季节筑坝时避免此类裂缝提供参考。

英文摘要：

To study concrete cracking, a feedback analysis on variations of surface temperature gradient has been conducted for concrete at the intermission stage of layer pouring with a precise model and finite element simulation method combined with in-situ experiments of a dry hot valley dam. This paper presents the results of concrete stresses and their development under real concrete temperature gradient, and explores the internal crack mechanism and possible hidden cracks of the concrete. A discussion on effective measures for prevention of such cracking risk, particularly for construction of valley dams in a dry hot season, is also given. This work is of practical reference value for construction of concrete structure in dry hot valley.