格八拱坝加固工程施工期库水位计算分析

Water Level Analysis of Geba Arch Dam in Strengthening During Construction Period

针对格八拱坝加固工程采用后帮整体式大坝加高加厚方法,基于新老坝体结合特点,采用三维有限元法分别计算了正常蓄水位加固、死水位加固两种施工方案,分析了新老坝体应力变形状况及结合面状态,并比较了两种方案的优劣。结果表明,死水位加固方案改善了老坝应力状况,新坝坝体应力满足规范要求,且新老坝体结合面上的法向拉应力分布区域和应力值均较小,新老坝体的整体工作性态较好。因此,在格八水库加固工程施工期间,应尽量使水库保持低水位。

The Geba arch dam is thickened and heightened by the back dam integral strengthening.According to the characteristics of the joint old and new dam,three-dimensional finite element method is used to calculate two different construction strengthening schemes with reservoir at the normal level and dead level,the stress and deformation of the dam body and the joint surface between old and new dam is also analyzed and compared the advantages and disadvantages of two construction schemes.The results show that the stress state of the old dam is improved in the construction scheme with the reservoir at dead level,while the stress of the new dam satisfies the demands of design specification;the normal tensile stress and its distribution area are all small on the joint surface of the old and new dams,so the whole dam is in a better working state.Therefore,the reservoir should be kept at a low level for Geba arch dam strengthening during the construction period.