三板溪主坝面板破损前后应变应力分析

通过分析三板溪主坝面板应变应力监测资料,发现一、二期面板压应力很大,分期浇筑接缝处承受8～15 MPa的压应力,在蓄水期水位快速上升过程中,面板挤压破损,需降低水位检查修补,影响工程安全和效益。面板修补后虽取得了一定效果,但面板高压应力的情况仍存在,应加强监测和现场巡查,密切关注渗漏量等的变化,保证大坝的安全运行。

Analysis on stress and strain before and after the face-slab damage of Sanbanxi dam

By analysis on the monitoring data of face-slab stress and strain,huge compressive stress was found on the face-slab,and the compressive stress at the joints was 8～15 MPa.In the process of storage water level rising,face-slab damage happened which exerted bad influence on the safety and profit of the project.Although rehabilitation,high compressive stress didn t disap-pear which called for closer monitoring.Only in this way,dam safety can be guaranteed.