根系變形模式與含根土壤剪力強度之研究

Study on Deformation Mode of Root and Shear Strength of Soil-Root System

朱榮華(Rong-Hwa Ju) ； 游新旺(Hsin-Wan Yu) ； 陳主惠(Chu-Hui Chen)

《中國技術學院學報》 27期 (2005/07) Pp. 207-219

https://doi.org/10.6369/CKCSHYHP.200507.0207

摘要

含有植生根系補強的土壤會增加土壤之凝聚力和內摩擦角。當穿過滑動面的根系分佈範圍越廣及貫入深度越深，則對於增加土壤剪力強度的功能越大，並可提高邊坡的穩定性。
本文以Waldron的根系力學理論爲基礎，另提出「根系擬纜索變形模式」來估算土壤剪力強度增量，並與相關試驗結果作比對。
研究結果顯示，以「根系擬纜索變形模式」來估算土壤剪力強度增量與Waldron評估所得結果頗爲相似。當剪力帶厚度不大時，根系變形模式採直線或拋物線對評估結果影響不大且本分析模式亦屬合理。對草本植物根系而言，當剪力位移愈大時，本文所提分析模式之評估值與實測值愈顯接近。

關鍵字

土－根系統 ； 變形模式 ； 剪力強度

並列摘要

The capability of root in increasing the shear strength of soil mass has been investigated and verified in the previous studies. The slope stability was enhanced due to the root system permeated through the shear zone and deeply anchored into the potential slip plane. Based on the soil/root mechanical model of Waldron (1981), a cable-shaped deformation model is proposed to evaluating the increment of shear strength of soil/root system resulted from the reinforcement of roots. The proposed analytical model is eventually verified by comparing the analytical prediction with the experimental measurement from Waldron. From the computation results, it was observed the analytical predictions are reasonably coincident with those from the experimental measurement. For the case of shear zone with thin thickness, both straight-line and cable-shaped models exhibit minor influence on the reinforcement of shear strength. For the root system of herbaceous plant, the proposed model is capable of capturing the realistic deformation mode of soil/root system as the shear displacement is continuously proceeds to a value of high level.

並列關鍵字

Soil-root system ； Deformation mode ； Shear Strength