Matric suction effect on distribution of stresses caused by vehicle wheels on a bare silty sand

-Soil compaction in cropping systems, caused by the external pressure of machinery, creates impermeable layers that restrict water and nutrient cycles reducing agricultural production. To evaluate matric suction effects on distribution with depth stresses a soil, use Jet Fill tensiometers were installed at two different depths (i.e. 0.15 m, 0.30 m) soil profile constituted silty sand gravel (SM); to register increments subsoil vertical stresses, miniaturized load cells 16. 5 mm diameter) horizontal position under centre line vehicle wheels’ path, approximately m depth. Care was taken calibrate field conditions. A made pass over surface, speed less than km/h; tyre inflation applied wheel 380 kPa. Response loading evaluated average measured profile. Finally, have been compared values obtained applying well-known elastic theoretical methods used assess tyres bare soils. The corresponding results show increment decreases as increases, good correlation between measurements simulations stress.