培地茅根系對邊坡穩定性之加勁效果評估

An Evaluation of Reinforced Effect of Vetiver Grass Root System on Slope Stability

林德貴(Der-Guey Lin) ； 吳榮珠(Jung-Chu Wu) ； 黃伯舜(Bor-Shun Huang)

《坡地防災學報》 7卷1期 (2008/03) Pp. 22-37

https://doi.org/10.29995/JSHR.200803.0002

摘要

培地茅為聯合國在第三世界國家大力推行的水土保持植物，自1986年起推廣應用後，已引起廣泛的注意。本研究除了彙整培地茅根系相關運用資料外，為了瞭解培地茅根系對邊坡穩定性之影響，乃採用極限平衡分析法，對全尺寸培地茅植生邊坡之根系力學補強效果進行量化效益評估。由分析結果得知，培地茅植生邊坡之潛在破壞滑動面皆由培地茅根系之下方土層通過，此乃由於深入土層之培地茅根系具有相當程度之抗剪強度，能有效抑制潛在滑動面由根系通過，並驅使潛在滑動面往深層發展。此外，培地茅根系在隨時間生長之情況下，根系入土越深越能有效提升邊坡之穩定性。

關鍵字

培地茅 ； 根系 ； 潛在破壞滑動面

並列摘要

The plantation and application of vetiver grass in soil and water conservation and environmental aspects have been extensively promoted to Third World countries by United Nations since 1986. In addition to integrating the relevant applications of vetiver grass on various engineering aspects, this research carried out a series of stability analysis and parametric study on a full scale vegetated slope using vetiver grass. The analysis attempts to quantify the reinforcement effect of root system of vetiver grass on slope with various inclination angles. According to the numerical results, the development of potential sliding surface of vegetated slope is significantly dependent on the penetration depth of root system of vetiver grass. The potential sliding surface frequently slices beneath the reinforced zone of root system and this is due to the high shear resistance of root material of vetiver grass. Meanwhile, the root system is capable of restraining the occurrence of potential sliding surface and which alternately drives the sliding surface to the deeper soil stratum. Moreover, as the time elapsed, the growth of root system of vetiver grass can deeply penetrate the underlain soil layer and effectively increase the stability of hill slope.

並列關鍵字

Vetiver grass ； Root system ； Potential sliding surface