Abstract：
The plasticity and water-holding capacity of silt subgrade are quite low, it need the improvement treatment of subgrade soil in construction. This paper rely on reconstruction project of 107 national highway Zhengzhou Section, through compaction test and unconfined compression test obtain a series of mechanical parameters, then select out the optimum scheme of improved soil mix proportion, and monitor cross section of the corresponding road section. Cement-lime improved soil satisfy the engineering requirement, not only has a good improvement effect but also repaired the gaps of uni-doped improved soil.
