It is found in the survey that the sliding surface has a three segments form, including sliding surface of forward edge, drawing open surface of back edge and shearing surface of inter part.
考察中发现，滑动面具有前缘滑移面、后缘拉裂面和中间剪断面的三段式形态。
Finally the shearing fatigue model of the surface strengthening spring is suggested.
最后给出了表面强化弹簧的剪切疲劳模型。
Increasing the arch thrust augments the shear stress on the surface of the shearing resistance part, which counteracts the influence of the crushed rock.
同时由于拱向应力的增大，即增大了抗剪面剪应力，抵消了坝体下游破碎岩石的影响。
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