Abstract: Small highway structures often distressed due to the insufficient bearing capacity in the foundations. The distressed structures might be a potential hazard for the safe operation of the highway. In northern Anhui, alternating of soil strata with significant different stiffness are widely deposited. The conventional bearing capacity evaluation method might not applicable to these stiffness alternating soil strata. This paper presents the evaluation results of the incremental stress spreading in the multi soil layers. The influence of the thickness of the target soils and the width of the foundation on the bearing capacity of the foundation is discussed. The fast and reliable evaluation of the foundation bearing capacity in the multi soil strata with stiffness alternations.\=

Key words: Multi Soil Strat Foundations, Bearing Capacities, Incremental Stress, Stress Spreading