土壤與補強物之力學效應

THE EXPERIMENTAL STUDY ON THE SOIL STABILITY IN THE SLOPE FAILURE AREA: Physical Effect of Soils & Reinforcements

李正義(Cheng-I Li)

《中華水土保持學報》 13卷1&2期 (1982/12) Pp. 95-120

https://doi.org/10.29417/JCSWC.198212_13(1_2).0004

摘要

本研究係根據六十八年度與前農復會合作“坡地土壤安定度試驗”第二年計劃。以東部花蓮光豐路、台東利嘉林道及中部苗栗明德之“道路邊坡”；中部台中德基水庫及南部台南烏山頭水庫之“岸壁邊坡”；北部桃園龍潭大北坑地滑地之“自然邊坡”。由上述之冲蝕、崩壞地土壤與棕索、玻璃纖維塑膠及鋼索等補強物，作力學性試驗分析。探討坡地土壤與補強物間之強度效應，俾進一步驗證添加補強物具有增強土壤穩定之效力。並擬定適當之處理方式，以供邊坡穩定施工之參考。分析結果如后：1.以棕索、玻璃纖維塑膠（GFRP）及鋼索等補強物處理冲蝕、崩壞地土壤，顯示能增強土壤之穩定效力。2.以鋁箔片爲補強物處理乾細砂，於低圍壓力下，其強度隨鋁箔片加入量（密度）之增加而增強。3.於最佳含水量（O.M.C.）條件之土樣，以直接剪力試驗法測定不同補強物對參試坡地土壤之摩擦適應性，結果以玻璃纖維塑膠爲佳，棕索次之，鋼索較差。

並列摘要

This is a continuation of the 1979 project entitled ＂The Experimental Study on the Soil Stability in the Slope Failure Area＂. The objective of this study is to find out the stress difference among the soils with various reinforcements in order to propose feasible methods to reinforce the stability of soils in the slope failure .areas. Soil samples at the side slopes of mountain roads, reservoir shorelines and natural slopes and reinforcements of palm, glass fabric reinforced plastics and steel were prepared for compaction test, triaxial compression test, extension test and modified direct shear test. The results obtained are summarized as follows: 1. Positive effects were measured on the stability of the soils treated by palm strand, glass fabric reinforced plastics (GFRP) and steel strand. 2. The strength of the dry sand treated with aluminium foil disc is reinforced in proportion to the amount of aluminium foil disc inserted into the soil samples. 3. The results of the modified direct shear tests at optimum moisture content indicate that the relative adaptability of the reinforcements are in the order GFRP, Palm and Steel.