冻融作用对边坡稳定性的影响浅析

Brief Discussion on the Influence of Freeze-thaw Action on Stability of Side Slope

针对季节性冰冻地区春融期间路堑边坡的浅层滑塌破坏,分析了冻融作用对边坡稳定的影响、冻融滑坡的形成机理及影响因素,给出了冻融滑坡稳定系数的计算公式,并通过工程实例分别计算了边坡在正常工况、冻融状态下的稳定系数,说明在冻融状态下路堑边坡稳定系数会明显降低,造成边坡失稳。提出了边坡冻融破坏的几种防治措施,得出了应充分注意冰冻地区的特点,加强土体强度指标试验及排水、防护设施设计、施工等结论。

Aimed at the collapse cutting slope superficial layer in seasonal frozen region during spring thaw period,the influence of freeze-thaw action on stability of side slope and formation mechanism and influencing factors of freeze-thaw landslide are analyzed,and the calculation formula of its stabilization coefficient is given.The stabilization coefficients of side slope under normal operating condition and freeze-thaw condition are worked out through engineering projects.It is proved that stabilization coefficient of cutting slope under freeze-thaw condition decreases obviously to cause instability of side slope.Several preventive treatments for freeze-thaw damage of side slope are proposed.It is concluded that it should pay attention to the characteristics of frozen region and reinforce the strength index test of soil body and the design and construction of drainage and protection facilities.