白鹤滩特高拱坝层间性能监控系统研究与应用

恶劣的环境会对特高拱坝层间结合性能产生不利影响。本研究测试了大坝混凝土在不同温度下的层间劈裂抗拉强度,建立了成熟度与强度系数的关系。同时,基于成熟度与强度系数及含水量的关系提出了以成熟度为主含水量为辅的大坝层间性能三级九梯度预警体系。结果表明,随着温度的升高,大坝混凝土层间力学性能呈下降趋势。同时,成熟度与混凝土的强度系数及含水量线性相关,相关系数分别为0.9985和0.9964。此外,根据成熟度与层间性能参数之间的关系所建立的预警体系,可以对大坝层间结合质量进行有效的控制。

Study and application of interlayer properties monitoring system for Baihetan extra-high arch dam

Harsh environments pose an adverse effect on the interlayer bonding properties of extra-high arch dams. In this study, interlayer splitting tensile strength of dam concrete is tested experimentally at different temperatures, and a relationship between maturity and strength coefficient is established. And we develop a three-level nine-gradient early warning system for dam interlayer properties based on the relationship between maturity, strength coefficient and water content, taking maturity as the main factor and water content as a supplement. The results show that for the dam concrete tested, its interlayer mechanical performance degrades with a rise in temperature, and its maturity is linearly related to its strength coefficient and water content, with correlation coefficients of 0.9985 and 0.9964 respectively. And by using this early warning system based on the relationship between maturity and interlayer properties parameters, an effective control of dam interlayer bonding quality can be realized.