三峡大坝14号坝段坝体应力应变分析及预测

为了解三峡左岸大坝应力应变的工作性态及变化趋势,选择大坝的14号关键坝段对坝体的应力应变进行分析.分析表明,坝体应力应变在设计的混凝土标号的抗压、抗拉强度范围内,其分布及变化符合重力坝一般规律,工作性态正常;预测数学模型的定量分解结果认为,影响坝体垂直向应变的主要因素是坝体自重,其次是水位,时效及温度对坝体影响较小.水库蓄水抬高到155.5m,175 m时,预测坝体应力应变均在设计的混凝土标号的抗压、抗拉强度范围内,工作性态正常.

Stress and Strain Analysis and Prediction for Dam Block 14 of Three Gorges Dam

stress and strain are two important monitoring items for evaluating the safety of a dam structure. For a good understanding of the behavior of stress and strain of the Three Gorges Left-bank Dam and their trend , the key dam block 14 is chosen as a research section. The stress and strain analysis indicates that the stress and strain of dam block 14 are within the range of compression intensity and tensile strength of designed concrete mark. The distribution and change of the stress and strain accord with the general law of gravity dam, and the behavior is normal. A quantitative analysis with a mathematical prediction model indicates that the factors influencing the dam body strain in the vertical direction are mainly the deadweight of the dam body, and secondly the water level, and the time effect and temperature factor are insignificant. When the water level reaches 155.5 m and 175 m, the predicted stress and strain are within the range of the compression intensity and tensile strength of designed concrete mark, and the behavior of the dam is normal.