Analysis of Deformation and Stability of Loess Gully Filling Section Subgrade Reinforced by Grouting
The reinforcement of diseases subgrade of a highway in Shanxi Province was taken as an example.Based on the analysis of subgrade diseases cause,the disease was treated by cement-loess grout grouting and ash soil ex-trusion pile method.Through the combination of field test and numerical simulation,the technical parameters of treatment were determined.The deformation and stability of the subgrade after reinforcement were analyzed,and the reinforcement effect was evaluated by long-term monitoring.The results show that the ultimate load of the reinforced soil is 358 kPa,the deformation modulus is 25.38 MPa;The maximum settlement of the subgrade surface is 84.6 mm,the maximum horizontal displacement of the slope foot is 4.13 mm,the maximum settlement of the slope foot is 12.56 mm,and the safety factor of the slope stability is 1.746;The maximum cumulative settlement value is 65 mm and the maximum differential settlement one is 12 mm.All meet the requirements and the reinforcement effect is obvi-ous.The research results can provide certain reference for the prevention and treatment of subgrade disease in future.
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