结果表明，掉块缺陷的形成是由于钢轨滚动接触疲劳伤损所致。
The result shows that rolling contact fatigue failures caused swap block defects of rail.
岩石弱面的存在使得井壁在弱面方向先于岩石本体破坏，使破碎易于掉块。
The existence of the weaken surface made the rocks damaged before the rock mass, it will be broken easily.
本研究成功地解决了胎体与钢基体结合强度、同心度及金刚石掉块等关键技术问题。
The key technical problems of the bond strength between the matrix and steel body, the concentricity and diamond segments sealing off from the body are successfully resolved in the studies.
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