CASESTUDY SUBGRADE IMPROVEMENT TX1 over 12 in. of blended subbase. The large volume of overexcavation complicated the short construction season and created a 25-in. elevation change next to the existing lanes of traffic. Site Conditions: The subgrade included aged clay soils with very low shear strength. These soils are commonly found throughout the state. Alternative Solution: Compensating for the lower resistance value of the clay would have re

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