Abstract
Phyllite soil has low bearing capacity and can not meet the mechanical properties of subgrade, so it is proposed to use special soil (red clay) to reinforce and improve phyllite soil. The shear strength indexes of unsaturated and saturated mixed soil were obtained by shear strength tests, and the ultimate bearing capacity calculation model was established based on shear strength indexes and plate load test. The calculation results show that the reduction of the ultimate bearing capacity can exceed 50% after saturation. According to the detection indexes of foundation coefficient (K 30) and the requirement of medium and long-term bearing capacity in the subgrade code, the minimum blending ratio of red clay in different filling layers of subgrade was obtained through comparison, which can provide a basis for improving special soil with special soil.
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