【摘要】 通过对垫江双河拱坝的开裂原因的初步分析,建立了地基与大坝的三维网格模型,运用自己开发的TFINE计算程序,对拱坝不同高程的地基做了不同工况条件的敏感分析计算。得出如下结论:大坝的自重和坝中上高程地基减弱是造成拱坝下游面最初发生纵向裂纹的主要原因;水压和泥沙的压力能增大下游面的受压,并减少下游面第二主拉应力的产生,如减少水荷载,则下游坝面仍能在自重作用下出现裂纹。更多还原

【Abstract】 This paper aims to qualitatively analyze the mechanics of vertical crack opening along the downstream wall of Shuanghe arch dam after two years of operation. In this study, a three dimensional code, TFINE, was employed to investigate the foundation sensitive on cracking of downstream wall under two types of loading case. The results shown that: weight and weak foundation close to middle-upper dam lead the vertical cracks to propagate along the downstream wall; pressure of water and sand promotes compression to increase, and tensile to decrease in downstream wall; with decreasing of water pressure, the vertical cracks of downstream wall would be propagated again.更多还原