Calculate the subgrade CBR value for the following CBR test results shown in Table 1 below. Compute the resilient modulus (Mr) of the subgrade soil in (MPa) and subgrade reaction modulus (k). Table 1: subgrade CBR test results 0.0 0.05 0.075 0.025 0.1 0.200 0.300 0.125 0.150 0.175 949 801 880 0.400 0.500 1250 1376 0 97 269 464 667 1012 1161 0.3 0.5 0.6 Penetration (in) Penetration stress (psi) 1600 1400 1200 1000 800 600 400 200 0 .... 0 0.1 0.2 2 0.4

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Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.