Abstract：The herbs living in the slope is helpful to decrease the erosion of the rain to the soil，improving the resistance shear strength of the shallow soil and so on. The article has been analysis and assessment the WU.T.H and Waldron model separately that herbs rootss reinforced effect can be calculated by formulas. Obtained the advantage and disadvantage respectively. Based on the WU.T.H and Waldron model，introduced the depth of the coefficient，revised and improved the initial model of reinforcement soil，obtained the new interactive diagram of root and soil，the model can describe the whole shear process used by pressure，shear displacement，the depth of the coefficient and the root diameter. Introduce the parameters obtained by two roots-soil shear test to the modify model，concluded the results calculated by modified model less than the Waldron model，while the results calculated by modified model was most close to the test value. So，the modified model was better than the Waldron model.
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2016, Vol. 35 
