For vented case with k > 0.5kPa/m, the pullout capacity factors are lower than that for attached base. But when k = 0.5kPa/m, the pullout capacity factors for vented base are the same as that for attached base.

• 当强度梯度k>0.；5kPa/m时；可以分开情况下承载力系数从开始上拔时就低于始终粘结情况；但是当k=0