矩形渡槽运行期人工模拟环境抗裂性能试验研究

针对已建渡槽运行期普遍出现的间接荷载作用下的裂缝问题，在人工气候模拟环境下开展单厢钢筋混凝土矩形渡槽模型试验研究，通过测量瞬态温度变化时空槽、通水两工况下的混凝土温度、应变的变化，分析矩形渡槽模型温度、应变规律及开裂风险区域。结果表明：空槽工况下渡槽的内外表面混凝土为开裂风险区域，通水时外表面及水位上方的内表面混凝土为开裂风险区域；降温前裸露部位应采取保温措施。

Experimental Study of Anti-cracking Performance of Rectangular Aqueduct Under Artificial Simulation Environment

In order to solve the crack problem of existing aqueducts because of indirect load during operation period ,the anti-cracking experiment in an artificial climate laboratory was carried out .The model is single - box reinforced concrete rectangular aqueduct .Variation of temperature and strain of rectangular aqueduct model was measured during the opera -tion period of empty and holding water .Regularity of temperature ,strain and crack risk areas of rectangular aqueduct was also analyzed .The results show that internal and external surfaces of the aqueduct have high cracking risk when it is empty ,and external surfaces and inner surfaces above water level have high cracking risk under the condition of holding water .Heat preservation measures of the areas contact with air should be taken before temperature drop .