他发现聚碳酸脂中的屈服区是延伸至裂纹前沿的长条裂缝。
The yield zones he found in polycabonate were slits extending ahead of the crack .
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。
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.
通过含有结构面的岩体的应力，位移以及屈服区的分布特点，讨论了反倾边坡的稳定性问题。
By using distribution features of stresses, displacements, and yield zones in rock mass, the stability problem of anti inclined slope is discussed.
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