The bearing yield load envelope curve on M-H plane is also an ellipse apporoximately, this ellipse can be determined by the result of two laterally loaded pile tests.

• 弯矩、水平荷载作用下的承载力屈服包络线也可以近似地用椭圆来表现，此包络线可根据两次不同载入高度的水平载荷试桩结果的关系式求得；