碾压混凝土拱坝诱导缝设置研究

Study on Induced Joint Design of Roller Compacted Concrete Arch Dam

鉴于制定合理的诱导缝分缝方案是改善碾压混凝土拱坝坝体应力、防止大坝开裂的重要措施,采用三维有限元技术,考虑施工期瞬态温度荷载作用,比较分析了桑郎碾压混凝土拱坝在不同分缝方案下的诱导缝开裂情况和坝体应力。结果表明,在靠近拱坝高拉应力区设置的诱导缝更易开裂,有效地起到释放坝体应力的作用;诱导缝的开裂对坝体不同部位的应力改善效果不同,诱导缝开裂后拱坝上下游表面高拉应力值降低明显,但远离诱导缝的坝内应力值降低较小,对碾压混凝土拱坝的诱导缝设置具有一定的参考作用。

Making a reasonable induced joint scheme is vital for improving the stress distribution of roller compacted concrete（RCC） arch dam and avoiding cracks in the design of RCC arch dam.Based on the 3D FEM and considering thermal stress in the construction period,the cracking of the induced joints and the stress distribution of the dam under different joint-setting schemes are analyzed in this paper.According to the comparison,it is concluded that induced joint crazes more easily and releases the stress of dam effectively when it is located in the high tensile stress area,and the effectiveness of stress relief for the different parts of the dam is different;when the induced joint cracks,the high surface stress of the arch dam will decrease greatly while the stress inside far away from the induced joint decrease relatively less.So,it provides reference for setting induced joints of RCC arch dam.