有渗透水作用时混凝土坝的实测应力分析

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。

Measured Stress for Concrete Dams with Seepage Water Effect

The stress and strain monitoring of concrete dam is the one of monitoring for dam safety,the dam heel is the furthest sensitive emphases place for stress and strain.Recur to elasticity mechanical analysis for porous material,processed research for component elements at measured stress and strain in stress gauge and strain gauge embedded concrete dams.The available stress,that act on framework of concrete and part of pore water pressure ηp included in measured stress by stress gauge,and the pore water pressure is full hydraulic head(lifting pressure) p for stress gauge,that embedded on the seam with body of dam and it’s foundation or the seamed face of body are Indicated.The strain gauge embedded with the same body of dam,the available stress-strain will only included in measured strain,and the part of strain by the pore water pressure without proceed.The theoretic basis provided that rightly applying monitoring data at stress and strain of concrete dams for evaluating character of dam safety.