陕北水平梯田埂坎经济安全侧坡分析

Analysis of Economic and Safe Side-slope of Earthbank of Terraced Field in North Shaanxi Province

陕北水平梯田埂坎常因设计不合理或施工质量较差而坍塌。在土质和培埂质量一定的情况下,影响埂坎稳定的因素主要是地坎坡度。侧坡陡,占地少,稳定性差;侧坡缓,稳定性好,但占地较多。通过稳定分析,求出陕北砂壤土、轻粉质壤土和中粉质壤土不同坎高的经济安全地坎侧坡。

The earthbank of terraced field in North Shaanxi Province often collapsed due to irrational design and poor quality of construction. The main factor influenced the stability of earthbank is the gradient of side-slope under the condition of a certain soil texture and same quality of cultivation of earthbank. The steeper the side-slope is, the less it takes up the land and the poor the stability is; while the gentler the side-slope is, the better the stability is and the more it takes up land. Through analysing the stability, economic and safe side-slopes of the earthbank with different heights, composed of sandy loam, light silty loam and medium silty loam in Shaanxi Province are obtained.