川西季节性冻土区土钉支护边坡冻融效应研究

Study on Freeze-thaw Effect of Soil Nailing Supporting Slope in Seasonal Frozen Soil Region in Western Sichuan

以川西季节性冻土区土钉支护边坡受冻融作用而产生破坏、滑塌等工程灾害为例,分析冻融作用对季节性冻土区土钉边坡的影响机理;基于水热力耦合理论建立土钉支护边坡模型,研究季节性冻土区土钉支护边坡的应力-应变规律。结果表明:在冻融作用下,土钉在钉头处的轴力变化最大,沿土钉方向轴力变化值不断减小,在冻结期轴力处于最大值;坡体水平位移随坡高增加不断增大,且冻结期的水平位移为最大值。

In relation to the slope engineering of soil nailing in seasonal frozen regions damaged and collapsed due to freezing and thawing in western Sichuan,the influence mechanism of freezing-thawing action on soil nailing slope in seasonal frozen region is analyzed.A soil nailing slope model has been established based on the water-thermal coupling theory,and the stress-strain law of soil nailing slope in seasonal frozen region has been studied.The results show that the axial force of soil nailing at the nailing head changes the most under the action of freeze-thaw,and decreases along the direction of soil nailing,and the axial force reaches the maximum value during the freezing period.The horizontal displacement of slope increases with the increase of slope height and reaches the maximum value in freezing period.