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In this paper, we investigate the influence on shear strength of the roots of four typical plants which can fix the soil in coal mining subsidence area by direct shear tests ,and the shear strength of the root soil composite .The results indicate that with the same root diameter (1.25 mm) , Sabina valgsris Ant., Salix psammophila, Caragannmicrophylla Lam. Artemisia sphaerocephala Krasch are more intensive...
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