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To that end, the following data were taken from literary sources: [rho] = [1.0.sup.2]/c[m.sup.3] - volume weight of the superphosphate; [phi] = 25[degrees]; 30[degrees]; 35[degrees]; 40[degrees]--angle of friction between the mineral fertilizer and metal; [gamma] = 30[degrees]; 35[degrees]; 40[degrees]; 45[degrees]--opening angle of the frontal edge of the pin; h = 1.0 cm--thickness of the material on the transporter: [??]= 1.0 cm--frontal width of the pin edge; [phi] is the angle of friction between the fertilizer and metal; [gamma] is the angle of the frontal edge of the pin
Nomenclature [PHI] (Degree) = Angle of Friction. C (KN/[m.sup.2]) = Cohesive of Soil.
In our experiments, we performed measurements of the impact force moments of friction, coefficients of friction and angle of friction in the bearings, for this purpose a specially constructed mechanism which is shown in Fig.
For the angle of friction, the residual value was larger than the peak value.
In slope construction from mixed soil for increasing slope stability, employee of different types of soil with proper percentage is best option, in this regard 10 mixed soil types from red plastic soil and black, green, dark brown, yellow and light brown non plastic soils, sand, and two types of gravels 2 mm, 4.75 mm developed, and also from previous investigation (Table 1) safe bearing capacity, angle of friction, unit weight and cohesive of mixed soils sample for computerize model have been used, the Geo-Slope and origin software in calculation and identification of models behavior employed and the result of these research work by interpretation of mixed soil types characteristics and slope computerized model evaluated.
In the mixed soil type 3 due to consist of high level of soil cohesion, internal angle of friction and unit weight, maximum factor of safety is appeared.
For the embankments in terrestrial site and an angle of friction p taken equal to the minimal characteristic value of 36[degrees], the coefficient [f.sub.0]* depends on many parameters (granularity, internal angle of friction, etc) and it can be evaluated in function of the coefficient of uniformity of the embankment.
In this case the change of internal angle of friction has an effect on the slope of failure surfaces, and the model of mixed failure with elliptic pressure is the most unfavourable by giving the greatest tension forces in the reinforcements and the smallest factors of safety.