寒冷地区面板堆石坝施工期面板开裂原因  被引量:8

Cause analysis of face cracking of a CFRD during construction period in cold regions

在线阅读下载全文

作  者:何鲜峰[1,2] 汪自力[1,2] 何启[3] HE Xianfeng;WANG Zili;HE Qi(Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China;MWR Center for Levee Safety and Disease Prevention Engineering and Technology Research, Zhengzhou 450003, China;College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China)

机构地区:[1]黄河水利委员会黄河水利科学研究院,河南郑州450003 [2]水利部堤防安全与病害防治工程技术研究中心,河南郑州450003 [3]河海大学水利水电学院,江苏南京210098

出  处:《水利水电科技进展》2019年第3期68-74,共7页Advances in Science and Technology of Water Resources

基  金:国家重点研发计划(2016YFC0401610);黄河水利科学研究院基本科研业务费专项(HKY-JBYW-2014-04;HKY-JBYW-2017-21)

摘  要:针对寒区面板堆石坝施工期面板开裂问题,结合某实际工程,在原型监测基础上,通过结构变形、气温变化、水化温升、自身收缩等方面的计算分析,发现水化温升与环境温差是影响累积降温温差的主要因素,当累积降温温差较大时,混凝土内的温度应力可能超出面板混凝土的抗拉强度,导致面板开裂。因此,针对年度温差较大、混凝土浇筑期水化升温较高的工程,提出了避免此类温度裂缝的处理建议,如优化混凝土配合比,优化施工工序,提高混凝土抗裂能力。In view of the face cracking of a CFRD during construction in cold regions, the structural deformation, temperature variation, hydration temperature rise and its own shrinkage were analyzed with an actual project based on prototype monitoring. It is found that the highest value of the hydration temperature rise and the maximum temperature difference in the later cooling is the main factor affecting the temperature difference of cumulative cooling. When the temperature difference of the cumulative cooling is larger, the temperature stress may exceed the tensile strength of the panel concrete, causing panel cracking. Suggestions for avoiding temperature cracks were put forward for construction projects with larger annual temperature difference and higher hydration temperature during the concrete pouring period, such as optimizing the concrete mix ratio, optimizing the construction process and improving concrete crack resistance.

关 键 词:混凝土面板 施工期 面板开裂 裂缝成因 寒冷地区 收缩变形 温度应力 

分 类 号:TV641.4[水利工程—水利水电工程]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象