Study on the influencing factors of shear strength of root-soil composite
In order to compare the effect of component of root-soil composite and normal stress on the shear strength of the root-soil composite.The root-soil composite for Pinus yunnanensis and the non-rooted soil,located on the slope(gravel sand areas of Anning River)of Mianshan Town in Xide County of Sichuan Province,were selected as the objects of study.Direct shear test and drying test were conducted.Pearson correlation analysis was conducted to seek the relationship of mass between dry soil,water and dry root in the root-soil composite.The regression analysis model between mass of components of the root-soil compos-ite and the shear strength was established to calculate the standardized regression coefficients.The results showed that:in the root-soil composite for Pinus yunnanensis,mass of dry soil was significantly and nega-tively correlated with mass of dry root(P=0.002＜0.01,r=-0.792),and mass of water was no signifi-cantly correlated with mass of dry root or dry soil(P＞0.05).The standardized regression coefficients of dry soil mass,dry root mass and water mass with shear strength of the root-soil composite were 0.06,0.03 and 0.03,respectively.It indicated that the effect of dry soil mass on the shear strength was greater than that of water mass and dry root mass.The internal friction angle and the cohesion of the root-soil composite for Pinus yunnanensis increased by 1.31％-1.97％and 16.71％-34.74％compared with the non-rooted soil,respectively.
gravel sandroot-soil compositeshear strengthcorrelation analysiscomponent mass
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