横缝间隙对拱坝应力状态的影响分析

Influence of gaps of transverse joints on stress of arch dams

考虑拱坝分期施工过程,采用常刚度加速迭代算法研究了横缝间隙对小湾拱坝应力状态的影响.对灌浆后横缝没有间隙和存在0 5mm的间隙两种情况进行的对比计算和分析结果表明,横缝间隙的存在对坝体应力分布规律的影响不大,但对应力的大小有较大影响,即坝体上游面拉应力大小和拱冠梁底部拉应力范围均有明显增大.

In consideration of different construction phases of an arch dam, the influences of gaps of transverse joints on the stress of the Xiaowan arch dam were studied by use of the accelerated iteration method with a constant stiffness. A comparative calculation and analysis of the Xiaowan arch dam for two cases-0.5?mm gap of transverse joints and absence of gaps-shows that the gap has little influence on the stress distribution, but has obvious influence on the value of stress, and that the extreme value of tensile stress on the upstream surface and the tensile stress area on the bottom of cantilevers increase notably.