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通过直接拉拔试验研究了加载速率、根系埋深和不同树种对根系与土体的摩擦特性的影响.结果表明:被拉断的根系最大拉拔力和位移关系曲线分为陡峭上升和陡峭下降两个阶段,被拔出的根系最大拉拔力和位移关系曲线分为陡峭上升、陡峭下降和平缓下降3个阶段;加载速率或埋深增大时,根土静摩擦力及其对应位移亦增大;落叶松的根土静摩擦力及其对应位移比油松的根土静摩擦力及其对应位移大.
The effects of loading rate, root depth and different tree species on the frictional characteristics of root and soil were investigated by direct pullout test.The results showed that the relationship between the maximum pullout force and displacement of the root system was divided into steep rise and steep decline In the two stages, the relationship between the maximum pullout force and the displacement of the extracted root system is divided into three stages: steep rise, steep decline and gentle descent. When the loading rate or depth increases, the static friction force and its corresponding displacement The static friction and the corresponding displacement of the root of Larch were larger than the static friction of the root of Pinus tabulaeformis and its corresponding displacement.