Influence of Vetiver Root System on Mechanical Performance of Expansive Soil: Experimental Studies

Figure 7

The expansion rate of soil in different soil layers varying with time: (a) 0∼5 cm; (b) 5∼10 cm; (c) 10∼15 cm; (d) 15∼20 cm; (e) 20∼25; (f) 25∼30 cm (90 and 180, the growth age; P, the root-soil composite sample; SP, the pure soil sample; a∼f, different sampling depths; 1 and 2, the parallel test group number).

(a)

(b)

(c)

(d)

(e)

(f)