Estimation of Soil Shear Strength Indicators Using Soil Physical Properties of Paddy Soils in the Plastic State

Saturated soil shear strength is a primary factor that reflects the driving resistance of agricultural machinery in paddy soils. The determination indicators, such as cohesion and internal frictional angle, crucial to improve walking efficiency However, measurement these indicators often costly time-consuming. Soil moisture content, density, clay content are factors affect friction while very limited studies have been performed assess interactive effects three on characteristics, especially In this study, eight samples were taken from fields Southeastern China, central composition rotatable design was used classify into five levels based different (X1), (X2), density (X3). direct tests carried out indoors remolded using self-made characteristic measuring device. Then, both individual X1, X2, X3 angles soils systematically investigated analyzed regression analysis method data processing software Design-Expert. Our results indicated environmental order X1 > X2 X3, for impact angle. X1X2 X1X3 X2X3 Two prediction models successfully established quantify angle affected by physical properties, coefficient (R2) 0.91 0.89 two equations, respectively. model validations new suggested capable predicting parameters under effectively, with errors between predicted measured within 15% relative root mean square error less than 11%.