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本文首先把大坝上游面与基础面组成的平面角看作为切口上受分布水荷载和均布水荷载作用的V型切口,从构造这种切口尖端附近的应力函数出发,推导出了切口尖端附近应力场和位移场的近似表达式;其次,通过实际算例论证了用有限单元法,采用常规单元计算V型切口应力强度因子的可行性;最后,计算了在水压超载和不同坝高情况下重力坝坝踵切口的应力强度因子k_1、k_2,同时还与采用文献[1]公式的计算结果进行了比较。计算分析表明:考虑坝踵切口水荷载和坝体体力时所得应力强度因子是合理的;对于纸坝,断裂破坏的可能性很小;对于高坝,断裂破坏的可能性较大,应该进行拉剪和压剪的断裂分析。
In this paper, the plane angle formed by the upstream surface of the dam and the foundation surface is regarded as the V-shaped incision on the incision under distributed water load and uniform water load. Based on the stress function near the incision tip, the incision tip The approximate expressions of stress field and displacement field in the vicinity of the reservoir are obtained. Secondly, the feasibility of calculating the V-notch stress intensity factor by using the finite element method is demonstrated by a practical example. Finally, In the case of gravity dam heel incision stress intensity factor k_1, k_2, but also with the literature [1] the results of the calculation were compared. The calculation and analysis show that it is reasonable to consider the stress intensity factor obtained when the water load of dam heel is cut and the body force of dam. The probability of fracture failure is very small for paper dam. For high dam, the possibility of fracture damage is greater. Fracture analysis of shear and compression shear.