The studied factors respectively are : length of soil nailing , insert deepness of piles , friction force of soil nailing interface , declination angle of soil nailing , horizontal spacing of soil nailing , rows of soil nailing , unit weight of soil , friction angle , unit cohesion , overload of slope , diameter of soil nailing 這11個因素分別為:土釘(錨管)長度、土釘直徑、土釘界面摩擦力、土釘下傾角、土釘水平間距、土釘排數、土體重度、內摩擦角、粘聚力、坡頂超載、板樁插入深度。