Abstract:

Aeolian sandy soil sampled from Hobq Desert was reinforced by PX soil stabilizer. A experimental studied was carried out on the strength characteristics of solidified aeolian sandy soil in different water containing states, different percentages of soil stabilizer, and different maintenance ages. Experimental results indicate that, the strength characteristics of aeolian sandy soil are different in different water containing states. The unconfined compressive strength of solidified aeolian sandy soil in optimum water content is much than the strength in saturated water content for the same stabilizer percentage and same maintenance age. The unconfined compressive strength of solidified aeolian sandy soil increases with the increase of stabilizer percentage and maintenance age in the same water containing state; and it increases quickly at the beginning of maintenance. While the stabilizer percentage is 8 %, the maintenance age is 28 d, the strength could meet requirement of international solidified sand. The shear strength of solidified aeolian sandy soil advanced obviously than aeolian, while the stabilizer percentage is 8 %, both the cohesive force and the internal friction angle reached max, and the shear strength of solidified aeolian sandy soil is 1.8 times as much as the aeolian. Furthermore, the change of the microstructure of the solidified aeolian sandy soil is studied by scanning electron microscope. Experimental results indicate that, the connection between grains changed from weak connection to adhesive bonded connection after mixed with PX stabilizer, explained the internal reasons why the solidified aeolian sandy soil’s strength could increase and its stability could advance.

Key words: aeolian sandy soil, chemical stabilization, strength characteristics, solidified mechanism