Study on the Deformation Characteristics and Disposal Scheme of High-filled Subgrade in the Northeast of the Qinghai-Xizang Plateau
For the high filling of the K44+920～K45+020 section of Tongsai Highway,after filling the upper non-wet collapses loess-like soil during construction,it was found that there was water seepage at the bottom.During construction,the groundwater and the covering layer were insufficient,resulting in large-scale deformation of the slope when the filling side was about 4m high.To this end,it is analyzed from the cause,geological characteristics and geometric characteristics of landslides,and the limit equilibrium method is used to analyze and calculate the stability of the current and post-construction saturation and seismic conditions.It is proposed to set a interception blind ditch with a depth of about 3m in the lower part of the side groove of the filling body,and the base of which is located in the lower mudstone with a depth of not less than 0.5m.Unload the current filling,then completely remove the weak saturated water layer,and set up the necessary drainage blind ditch before re-filling.Set up a disposal plan for partition anti-slip piles or foot protection walls at the foot of the slope.After disposal,the landslide is in a stable state,and the treatment effect is good.
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