拱坝裂缝成因三维有限元分析

Study on Crack Causes of Arch Dam by Using 3D Finite Element Analysis

根据某拱坝除险加固工程的需要,采用三维有限元方法模拟拱坝坝体的逐级加载和水位同步上升的过程,进行坝体在正常蓄水和温降条件下的应力计算分析,并通过多种方案对坝基材料参数进行敏感性分析,综合研究拱坝裂缝产生的原因。研究结果表明:拱坝建设期清基处理后的左、右岸坡段坝底基岩或垫座与原坝底未处理的完整性基岩模量相差较大导致一号裂缝产生;水荷载以及温度快速下降的共同作用导致其他裂缝产生。

According to the requires of a dam reinforcement engineering,the process of arch dam gradual loading and water level synchronous rise is simulated using the 3D finite element calculation model,the stress under the conditions of normal storage and temperature drop of the dam is calculated and analyzed,and the material parameter sensitivity analysis on dam foundation is carried out through a variety of scenarios,to comprehensively study the causes of cracks in arch dams.The results show that the 1st crack is caused by large difference between the bedrock modulus of bank slope section’s dam bottom or pedestal with the original untreated integrity bedrock modulus,and other cracks are created by the combination of water load and temperature dropping rapidly.