Research Article

Experimental Study on Physical-Mechanical Properties of Expansive Soil Improved by Multiple Admixtures

Table 14

Multi-index analysis of test results.

IndexA (coal gangue)B (fly ash)C (lime)D (null)

The plastic index/%k115.92716.45317.32714.930
k214.45313.63715.46314.300
k313.23713.52710.82714.387
Range R2.6902.9266.5000.630
Primary and secondary factorsC > B > A
Optimal solutionC3B3A3

Free expansion rate/%k125.53325.13324.80023.400
k222.06723.33324.20023.700
k322.66721.80021.26723.167
Range R3.4663.3333.5330.533
Primary and secondary factorsC > A > B
Optimal solutionC3A2B3

Shear strength/kPak1184.400190.500181.233209.367
k2212.333204.367197.333199.600
k3204.267206.133222.433192.033
Range R27.93315.63341.20017.334
Primary and secondary factorsC > A > B
Optimal solutionC3A2B3

The unconfined compressive strength/kPak11093.9131146.2701116.1431186.313
k21255.3871188.3371160.4131195.317
k31227.8301242.5231300.5731195.500
Range R161.47496.253184.4309.187
Primary and secondary factorsC > A > B
Optimal solutionC3A2B3