Analysis of the Mechanism of Settlement and Slip of Weak Subgrade Slope of Expressway and Micro-pile Composite Reinforcement
Based on the Ubisa-Shorapani(F3)tender section project of Georgia E60 Expressway,one of the key contribu-tion projects of China′s ″Belt and Road″ initiative,and in view of the settlement and slip of the weak subgrade slope of the highways,through on-site measurements and numerical simulations,the mechanism is explored and demonstrated,and the composite reinforcement measures with connected beam type micro-pile are proposed,and the parameters of the structure are optimized.The results are as follows.The safety and stability coefficient of the roadbed slope shows a trend of first in-creasing and then decreasing as the distance(Lx)between the first row of piles in the reinforcement area and the top of the slope increases.When Lx =2 m and pile inclination angle is 15°,the maximum safety stability coefficient is 1.542.The difference in the safety and stability coefficients for different pile diameters is small,with a maximum difference of only 0.1.Based on the sensitivity analysis optimization scheme,the maximum horizontal displacement of soil at the foot of slope after optimization is 10.8 mm.Compared with the untreated period,it was reduced by approximately 88.0 mm,a reduction of 89.1%.The maximum surface settlement on the left side of the roadbed is only 7.9 mm,which is about 12.1 mm or 60.5%less than that before the treatment.As time goes on,soil settlement gradually becomes uniform and stable.
expresswayweak subgrade slopesettlement and slipmicro-pile composite reinforcementscheme optimiza-tion
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