Engineering stabilizing sands techniques (stabilizing sands with sands barriers)

Sand barriers, made by straw, brushwood or branch, are used to control the direction and speed of wind sand so as to prevent deposition of sand carried by wind. Sands barriers are also the precondition and necessary condition for biological stabilizing sand (Fig. 18.2). ttere are vertical and horizontal sand barriers, tte vertical sand barriers are 50-100 cm high above sand surface, horizontal barriers are 20-50cm.

Height of vertical sand barriers: tte sand particles move at the lower layer of ground (bellow 10 cm), so the height of sand barriers is normally 15-20 cm, and sometimes 30-40 cm.

Lacuna of sand barrier: tte accumulated sand scope in front of barrier is 23 times of height of sand barriers, with 25% lacuna, tte smaller the lacuna, the shorter is the reach distance of the sand. Normally 25%-50% is adopted.

Shape of sand barrier: tte benefit of preventing and stabilizing sands is determined by shape of sand barrier, tte sand barrier should be vertical to dominant wind direction with a check- board of lm X lm.

Fig. 18.2. Sandsbarriers.

Chemical stabilizing sands techniques

Some chemical materials are sprinkled on the sandy surface, forming a concretion layer so as to fix the sands, tte materials include oil-products, macromolecule polymer etc.

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