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根据土力学原理，采用实验和野外调查相结合的方法，对长江三峡库区花岗岩山地林木固持土壤、稳定坡面作用进行了研究．认为内摩擦角是决定坡面稳定的重要因素，经实验得出内摩擦角与土层深度显著相关，林地土体的内摩擦角大于农耕地的内摩擦角；土体抗剪强度与土层深度呈正相关关系，土层越深其抗剪强度越大，林地土体的抗剪强度大于农耕地的抗剪强度．由典型坡面实地测量，得到坡面平均坡度值为：农耕地２８．７°，林地３８．７°．林地比农耕地高１０°，反映出林木在保持水土、稳定坡面中的重要作用．
According to the principle of soil mechanics, the effects of the soil-holding soil and the stable slope on the granite mountainous area in the Three Gorges Reservoir Area are studied by the combination of experiment and field investigation. It is concluded that the internal friction angle is an important factor that determines the slope stability. The internal friction angle is significantly related to the depth of soil layer. The internal friction angle of forest soil is larger than the internal friction angle of agricultural land. The depth is positively correlated, the greater the soil layer, the greater the shear strength, the shear strength of forest soil is greater than the shear strength of farmland. From the typical slope surface measurement, the average slope value is obtained: 28.7 ° of cultivated land and 38.7 ° of forest land. Woodland is 10 ° higher than the farmland, reflecting the important role of forest trees in maintaining soil and water and stabilizing the slope.