Keywords: 
• geotextiles /
• land reclamation /
• coal gangue /
• heavy metal /
• dynamic leaching

Abstract: Traditional filling with coal gangue can cause environmental pollution because heavy metals in the leachate of coal gangue may pollute the soil and water underneath. In order to study their abilities to prevent heavy metal pollution with column test, geotextiles were introduced into land reclamation of mining areas in China and polyethylenepolypropylene geotextiles(PE-PP), fibers needle punched nonwoven geotextiles, highdensity polyethylene(HDPE) and fibers geocomposites were chosen as experimental materials. To some extent, four geotextiles can reduce the content of heavy metals in the percolation solution. The total content of Cr was greatly reduced by PEPP and fibers needle punched nonwoven geotextiles, 23.7%～33.5% lower than contrast. The contents of Pb and Cu were reduced by HDPE and fibers geocomposites, 22.9%～26.8% lower than contrast. It is also found that the heavy metal content in the column is less than contrast for the adsorption of geotextiles. Geotextiles, which have better ability to absorb Cr, Pb and Cu, are PE-PP and fibers geocomposites, fibers needle punched nonwoven geotextiles, fibers needle punched nonwoven geotextiles and HDPE, separately. Geotextiles with various kinds and functions will be largely used in the land reclamation of mining areas in China.