Pull-out failure is the main damage form of round thread casing connections.

连接接头滑脱失效是圆螺纹套管损坏的主要形式。

The damage form of thick sandy soil layer was revealed and the damage mechanism was primarily analyzed through the dynamic simulating model test.

通过动态相似模拟试验，揭示了厚砂土层破坏形态，并初步分析了破坏机理。

Floor heave is familiar distortion and damage form in deep soft rock roadway, how to control floor heave effectively and economically is an urgent problem.

深井软岩巷道底鼓是常见的变形和破坏形式，如何有效、经济的控制底鼓是深部开采急需解决的问题。