地基弹模对坝踵区界面裂缝应力场的影响

The Stress Analysis for the Heel of Gravity Dam with a Crack Along the Interface

重力坝在荷载、温度、施工质量等多种因素作用下,坝踵区的坝体与岩基交界面常产生裂缝,如原苏联的布拉茨克坝就观测到了开裂深度达2～3m的裂缝.本文用断裂力学方法计算了该类裂缝问题的应力强度因子,并探讨了地基弹性模量对缝端附近应力场的影响.作者认为,用断裂力学方法分析重力坝时,必须考虑由于地基弹模的不同而引起的差异.

Under the action of load , temperature and construction quality etc,the crack often is caused in the heel of gravity dam. In this paper, the stresses and the stress Intensity factors for this problem are calculated by the method of fracture mechanics. The stress fields near the tip of the crack affected by the elastisity modulus of the foundation are also investigated.