基于坡面稳定的黄土路堑高边坡优化设计

Cutting high loess slope optimization design based on slope surface stability

通过室内外黄土边坡的冲刷试验结果发现,随着坡度的增加,坡面上的最大冲沟深度呈先减少、后增大的趋势。黄土边坡坡角值越接近临界坡角,坡面产生破坏的可能性越小。根据坡面流理论,导出黄土路堑高边坡抗冲刷的临界坡角。根据调查发现,当边坡的坡角相同时,单级坡体越高,坡体(即坡长越长)越易形成明显的冲沟。根据坡角、坡面长和坡面冲刷量之间的关系,建立了基于坡面稳定的黄土路堑高边坡优化设计模型。用该模型对典型路堑高边坡进行计算验证,优化结果和实际情况吻合较好。

Laboratory and field scour testing studies for loess slope indicate that the increasing of slope angle degree causes the maximum rill depth of slope surface firstly decreases and then increases later on;the nearer of the difference between the slope angle degree with the critical angle,the smaller possibility of slope surface erosion.The theoretical formula for calculating critical angle of cutting loess slope is derived based on Gradient current theory.A conclusion drawn from investigation is that the long...