工程科学与技术2017，Vol.49Issue(6)：73-83,11.DOI:10.15961/j.jsuese.201600767
短时冻区冰雪消融对残积土坡非平衡渗流与稳定性作用机理分析
Mechanism on the Influence of the Snowmelt Infiltration on the Non-equilibrium Flow and Stability of Residual Soil Slope
摘要
Abstract
In order to reveal the mechanism for the influence of the snowmelt infiltration on the non-equilibrium flow and stability of residual slope,the instability reason of a residual soil slope induced by snowmelt in Fujian Province was analyzed based on the unsaturated seepage model and the non-equilibrium flow model.Then,the influence laws of different diameters,distances,bending ratios and the lengths of macropores on moisture field and safety factor of the slope were also obtained based on non-equilibrium flow model.The results showed that non-equilibrium flow had a greater impact on the slope stability than that of considering unsaturated seepage.The theory of non-equilibrium flow could be adopted to reasonably interpret the instability mechanism of a residual slope induced by the snowmelt.With the increasing of the macropore diameter,the pore water pressure and the moisture exchange capacity between macropore domain and matrix domain would increase,but the priority conduction of water flow and stability for slope would decrease;the conduction route of water would be extended and water accumulation in the macropore would be decreased with the increasing of the length of the macropore.The length of the macropore played a certain part in the safety factor of slope.The bending ratio of the macropore had little influence on water content and safety factor of slope.There was a critical distance for the macropore distances which could lead to minimum safety factor of slope.The preferential flow of macropores would be restricted if the distance between macropores was too large,and the mutual superposition of non-equilibrium flow would decrease the pore water pressure in deep layer if the distance between macropores was too short.Therefore,the influence of non-equilibrium should be paid more attention for the instability of slope with macropore induced by snowmelt in the short-term frozen zone,especially in the distance between macropores and the length of macropore.关键词
残积土坡/短时冻区/冰雪消融/非平衡流/稳定性Key words
residual soil slope/short-term frozen zone/snowmelt/non-equilibrium flow/stability分类
交通工程引用本文复制引用
阙云,邓翔宇,陈嘉..短时冻区冰雪消融对残积土坡非平衡渗流与稳定性作用机理分析[J].工程科学与技术,2017,49(6):73-83,11.基金项目
国家自然科学基金资助项目(41302215 （）
41772297) （）
福建省自然科学基金资助项目(2014J01185) （2014J01185）
