高拱坝强约束区固灌抬动致裂问题研究

Study on Lifting Fracture in Strong Constrained Area of High Arch Dam by Consolidation Grouting

针对某高拱坝固结灌浆过程中发生的抬动及抬动裂缝现象,分析了坝体产生抬动裂缝的原因,采用考虑弹性约束的坝体抬动有限元仿真分析方法,反演基岩对坝体的弹性约束系数,并对灌浆压力和坝体混凝土盖重进行敏感性分析。仿真结果表明,过大的灌浆压力容易导致坝体抬动及抬动裂缝,而增加盖重对减小抬动及抬动引起的坝体应力效果显著。

Lifting and relevant concrete fracture often appear in the process of consolidation grouting of high arch dam, the reasons to lead to dam fracture were analyzed. A three-dimensional finite element simulation method, considering the elastic constraint between dam body and bedrock, was applied to inverse bedrock on the elastic con- straint coefficient, and the sensitivity of grouting pressure and concrete coverage thickness were also analyzed. The results show excessive grouting pressure easily leads to the lifting and relevant fracture, while the coverage thickness can reduce the lifting and the corresponding normal stress effectively.