百喜草根加勁土壤力學行為之研究

本研究將探討含百喜草根之土壤試體，在不同剪變位下根與土壤間之力學行為，同時對含根土壤剪力強度增量之兩種評估模式提出檢驗。簡易評估法（Wu et al.，1979）假設垂直根系在同一時間斷裂，根力模式（Waldron and Dakessian，1981）則假設垂直根系在不同階段循序斷裂。研究中發現，根生長茂密之植物，只考慮垂直根系之力學行為推估土壤之剪力強度增量，可能低估側向細根對土壤加勁所增加之土壤抗剪力。對於根生長稀疏之植物，假設根同時斷裂之簡易評估法，則可能會高估植物根對土壤之抗剪能力。結果顯示，經由根力模式所計算之土壤剪力強度增量有較正確之評估值。同時亦提供了較合理的評估程序和較易了解之土根間力學行為。

關鍵字

根力模式；加勁土壤；力學行為

並列摘要

This study examined the mechanical behavior of soils reinforced with Bahia grass roots under different shear displacements with two different models. The simple assessment method (Wu et al., 1979) assumes simultaneous breakage in vertical roots while the root strength model (Waldron and Dakessian 1981) assumes sequential breakage of vertical roots. Results indicate an underestimation of the shear strength increment of the soil among dense cluster roots when solely considering vertical roots and ignoring the contribution of lateral fine roots to soil reinforcement. On the contrary, the shear strength increment of the soil in sparse roots was overestimated with the assumption that the root's mechanical behavior is characterized by simultaneous root breakage as proposed in the simple assessment formula. Compared with the simple assessment formula, the root strength model gives a more accurate estimation of value and its procedure is more realistic for understanding the mechanics of soil-root systems.

並列關鍵字

Root strength model ； reinforced soil ； mechanical behavior

國際替代計量

百喜草根加勁土壤力學行為之研究

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