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摘要
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本研究旨在不同的水泥及菇肥比例進行土壤強化及植生試驗，探討不同的基材比例於pH值、土壤剪力強度、種子發芽率及植生情形等變化，以及兩者並行之最適比例，提供工程以水泥做為添加劑應用於改善坡面土壤強度的參考。
研究結果獲得於養護30天，水泥含量3%增至11%時，凝聚力由133 kPa增至324 kPa，為原土壤3.9 - 9.6倍；摩擦角由39.5°至 57.1°，為原土壤 2.0 - 2.8 倍。此外，菇肥的添加確能明顯提升草籽的發芽率，但添加菇肥卻造成土壤剪力強度大幅下降，菇肥含量10%混合水泥含量3%增至11%，凝聚力由35.8 kPa 增至172.5 kPa，為原土壤1.1 - 5.1倍；摩擦角由42°增加至54°，為原土壤2.1 - 2.7倍。綜合考量植生與土壤剪力強度，則建議選擇僅添加水泥5%，其發芽率為可達86%，而凝聚力為原土壤4.7倍，摩擦角為原土壤2.3倍。若考慮增加土壤滲透性，則選擇添加菇肥10%水泥7%之配比，發芽率為80%，凝聚力為原土壤3.2倍，摩擦角為原土壤2.4倍。在探討植生高度與根系長度會隨著水泥增加而下降，在水泥0% - 7%之根系長度與植生高度隨菇肥增加而增加，而根系長度大約為植高的0.22倍。土壤滲透係數會因為水泥含量增加而逐漸下降，而添加菇肥可提升土壤的滲透係數，以菇肥5%之滲透係數為原土壤3 - 100倍。
The purpose of this study is to investigate the effect of cement additives on soil shear strength and vegetation, the proportion of the pH value, soil shear strength, seed germination rate and grass conditions of different substrate ratios, to find a balance between the two content. Provide engineering uses cement as an additive to improve the slope soil strength. The research results were obtained by curing for 30 days. When the cement content increased from 3% to 11%, the cohesion increased from 133 kPa to 324 kPa, which is 3.9 to 9.6 times that of pure soil; the friction angle is increased from 39.5° to 57.1°, which is 2.0-2.8 times that of pure soil. In addition, the addition of mushroom waste can significantly improve the germination rate of grass seeds, but the addition of mushroom waste causes a significant decrease in soil shear strength. The content of mushroom waste is 10% and the cement content is increased from 3% to 11%, and the cohesion was increased from 35.8 kPa to 172.5 kPa, which is 1.1 to 5.1 times that of pure soil; the friction angle increased from 42° to 54°, which is 2.1 to 2.7 times that of pure soil. Considering the vegetation and soil shear strength, it is recommended to add cement content of 5%, the germination rate can reach 86%, the cohesion is 4.7 times that of pure soil, and the friction angle is 2.3 times that of pure soil.If increase the soil permeability are considered at the same time, choose the ratio of adding mushroom waste content of 10% and cement content of 7% , the germination rate can reach 80%, the cohesion is 3.2 times that of pure soil, and the friction angle is 2.4 times that of pure soil. In the discussion, the plant height and root length reduce when the cement content increases. In cement content 0% to 7%, The grass height and root length increases when the mushroom waste content increases, and the root length is approximately 0.22 times that of the grass height. The soil permeability coefficient increased with the increase of mushroom waste content, and adding mushroom waste can increase the soil permeability coefficient. The permeability coefficient of 5% mushroom waste is 3 to 100 times that of pure soil. |
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