The results show that the failure of dam foundation is caused mainly by the extension of dam heel crack and the expansion of shear-yield zone of the foundation rock near the dam toe.
结果表明，坝基的破坏主要表现为坝踵裂缝的延伸和坝趾附近基岩剪切屈服区的扩展。
On top of that, this method is used to calculate the stress intensity factors of interface crack at the heel of gravity dam, and some useful conclusions are presented.
作为应用，文中计算了坝踵界面裂缝的应力强度因子，得出了应力强度因子随坝基弹模、库水位和缝水压力的变化规律。
An observation on dam-heel crack for studying the abnormal sudden change of uplift pressure and seepage flow of blocks close to the round corner of right bank is also introduced.
对右岸转弯坝段扬压力和渗流量陡涨陡落的异常情况进行了坝踵开裂试验观测。
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