假设当两个接触面处于相对滑动的临界状态时，切向力与垂向力成正比。
Provided two contact bodies are in the critical state of relative sliding, the tangential force is proportional to the vertical force.
但是在模型试验中，却发现两个破裂滑动面都是倾斜的。
In was found from several model tests showing that, there are two fracture sliding planes yet none of them is vertical.
如果有一两个节理面真倾向线落在滑动区内，滑动破坏才可能发生。
If the true dip line of one or two joint planes plot within a sliding zone of double-faced slope, a double-faced sliding failure can be possible.
如果有一两个节理面真倾向线落在滑动区内，滑动破坏才可能发生。
If the true dip line of one or two joint planes plot within a sliding zone of double-faced slope, a double-faced sliding failure can be possible.
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