浯溪口水利枢纽20^#坝段裂缝成因分析

Analyze the causes of cracks in 20^# dam section in Wuxikou water conservancy project

浯溪口水利枢纽工程20^#坝段为碾压混凝土重力坝,通过对20#坝段应变计的数据分析,特别针对部分应变计出现测值增量突变现象,推测出该坝段的应变计埋设部位处于拉应力区,且第6组应变计附近出现混凝土裂缝.同时,分析认为该坝段的大坝应力应变将趋稳定.建议第6组应变计加密观测,重视数据整理分析工作,及时掌握裂缝发展情况,且做好其他坝段碾压混凝土温控措施,预防大体积混凝产生裂缝.

The 20# dam section in Wuxikou water conservancy project is roller - compacted concrete gravity dam, analysis of the strainmeter data shows that some of the strainmeters＇ values abnormally increased, so it＇ s speculated that the strain- meters were buried in the tensile stress area of the dam section, and that the crack showed up near the sixth strainmeter. In the meantime, it＇ s considered that stress and strain will grow to be steady. It＇ s suggested to undertake intensive obser- vation near sixth strainmeter and pay al：tention to data compilation so as to know the development of cracks. Temperature control measures should be taken among other section of the dam to prevent cracks in mass concrete.