In the tests, the high density polythene(HDPE) uniaxial geogrid and the weathered expansive marlite in Xinxiang, the Middle Route of South to North Water Transfer Project(SNWT) are adopted.

Experimental study on resilient modulus of soil reinforced by biaxial geogrid;

For conducting experimental study on alleviating bump at bridge-head,a method using biaxial geogrid reinforcement together with a short approach slab was applied in the approach embankment of a bridge in Connecting Expressway of Wuhan Yangluo Bridge across the Yangtze River.

The expansive soil samples reinforced with biaxial geogrid are adopted to carry out a series of tests at different dry density.

In this paper,the finite element method is used to study bridgehead embankment reinforced by two-way tensioned geogrid for the purpose of controlling vehicle bumping at bridgehead and to analyze the laws of influences of the geogrid layer spacing on the settlement,vertical additional stress distribution of the embankment and on the tensile stress and tensile strain of the geogrid.

A silty sand-embankment reinforced by two-way tensioned geogrid was constructed.

Test study on frictional strength of interlock blocks and two-way geogrids;

Test study on interaction characteristics between two-way geogrids and clay;

Wind tunnel test on effect of controlling windand deposited sand of geogrid sand-barrier;

Improvement of Controlling Method for Preheating and Stretching Process of Geogrid;

Numerical simulation and field test at the cut to fill location of subgrade treated with geogrids;