Analysis Of Mechanical Properties Of Solid Soil Based On Finite Element Analysis

Plant roots can increase soil strength and inhibit the occurrence of shallow landslides.The soil-fixing properties of plant roots mainly depend on the elastic modulus of the root system and the friction and anchoring properties with the soil.Through the study of elastic modulus and frictional anchoring characteristics between single roots and soil of three species: Indigofera amblyantha Craib ? Pyracantha fortuneana(Maxim.)Li)and Senna bicapsularis(L.)Roxb,the main results are as follows:(1)Among the three species,the elastic modulus of the root system is larger than that of the root system of fire-puckthorn and larger than that of the root system of double pod cassia under the same root diameter,tensile rate and effective tensile length.The elastic modulus of roots of the three species was affected by tensile rate,effective tensile length and root diameter.At the same tensile rate,the elastic modulus of root system and root system of Phyllostachys pubescens had a negative correlation with root diameter,and the elastic modulus of root system of the two species decreased gradually with the increase of diameter,which showed a power function relation,that is,(a?b is constant),the elastic modulus of multi-flower blue root system decreased first and then increased with the increase of diameter;The roots of the three species with the same diameter and large loading rate all have large elastic modulus,and the roots of the three species with long tensile length all have large elastic modulus.(2)The initial load is affected to some extent by the root diameter and root depth,and increases with the increase of root diameter and with the deepening of root depth.The friction peak of single root system of three species increases with the increase of diameter.With the deepening of root depth,the peak friction between single root and soil increased.The change of root diameter of the three species has no effect on the slip amount of the corresponding single root soil friction peak.The factors affecting the peak slip amount are root depth and loading rate.With the increase of root depth,the peak slip of the three species increased,the most of which was double pod cassia,followed by multi-flower wood blue and fire thorn.With the increase of root loading rate,the peak slip of the three species increased,in which the most increased was double pod cassia,followed by firethorn and multi-flower wood blue.Under the same conditions,when the single root of the three tree species reached the maximum anchoring friction force,the peak slip of the fire spine was the largest,while the double cheeks were the second,and the multi-flower wood blue was the smallest.(3)It is feasible to use finite element ANSYS15.0 to establish root soil complex to analyze the friction characteristics between root and soil.The results show that the maximum static friction of single root increases with the increase of root diameter and the depth of single root.The maximum friction force increases with the increase of root diameter and the increase of single root depth,and the peak slip is not affected by the diameter of single root,and is affected by the depth of buried and increases with the increase of single root depth.It is concluded that the best friction anchorage performance of the three species is firebuckthorn,followed by double pod cassia and multiflower blue.