舗装板および敷砂が踏圧による舗装構造下の土壌圧縮を緩和する効果

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  • The Reducible Effects of Paving Brick and Sand Layer on Compaction of Paved Subsoil by Trampling.
  • ホソウバン オヨビ シキズナ ガ トウアツ ニ ヨル ホソウ コウゾウ カ ノ ドジョウ アッシュク オ カンワ スル コウカ

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For a lot of urban plants, brick paved subsoil is used as a base soil of growing. But, cause of its bad soil physical properties, brick paved subsoil is known as one of the growing barrier of planted trees. Hereupon, this experiment was conducted to find out reducible effects of paving structure on compaction of subsoil as available to grow planted trees. The experimental lots were filled with granite weathering sandy loam soil, and constructed with changing the brick size, particle size and thickness of sand bed. The trampling was executed each day 3, 000 steps per m2 for 45 days. After-trampling, samples were taken by 100 ml core. The results can be summarized as follows;<BR>The effect of soil compaction decreased with increasing of each paving structure. And, on the basis ofmeasured data, experimental lots were diagnosed soil physical properties as a plants growing base soil by former research. The experimental lots had a any defective soil physical properties for plants were constructed without sand bed, small particle and 20 mm sand bed, large particle and 20 mm sand bed, small particle and 40 mm sand bed with a small brick, without sand bed with a large brick, and bare trampled. The effect of each paving structure was had a higher relation in order of brick size, thickness of sand bed, particle size by 2nd partial correlation analysis. And, the multiple regression equations could be estimated numerically at 1% level (γ2=0.771-0.950) by multiple regression analysis which carried out paving structure as the predictor variables, and estimable soil physical properties as the criterion variables.

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