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混凝土坝的应力、应变监测是大坝安全监测的项目之一,大坝坝踵是应力、应变最敏感的重点部位。借助于多孔材料弹性力学的分析,对埋设于混凝土坝中的应力计和应变计实测应力、应变中的构成成分进行了研究,指出了应力计实测应力中包含有作用于混凝土骨架的有效应力和部分孔隙水压力;埋设在建基面和接缝面上的应力计,其孔隙水压力为全水头扬压力。同样埋设在坝体混凝土中的应变计,实测应变中则仅包含有效应力应变,而没有因孔隙水压力产生的变形分量,为正确应用混凝土坝应力、应变监测成果评估大坝安全性状提供了理论依据。
Concrete dam stress and strain monitoring is one of the dam safety monitoring projects. Dam heel is the most sensitive stress and strain point. Based on the analysis of elastic mechanics of porous materials, the stress components and strain components in strain gauges buried in concrete dams are studied. The results show that the stress measured in stress gauges contains effective stress Part of the pore water pressure; embedded in the foundation and the joint surface of the stress gauge, the pore water pressure is full head pressure. The same strain gauge buried in the dam concrete, the measured strain only contains effective stress and strain, but not due to pore water pressure deformation component, for the correct application of concrete dam stress and strain monitoring results to assess the dam safety traits provides a theory in accordance with.