Stability Analysis of Circulating Fluidized Bed Fly Ash Subgrade Covered by Loess
Taking the circulating fluidized bed fly ash subgrade of G307 Fenyang reconstruction and expansion project in Shanxi Province as an example,the geotechnical properties and microstructure of circulating fluidized bed fly ash are studied and analyzed by means of indoor geotechnical test and optical microscope.The results show that circulating fluidized bed fly ash has high shear strength and compression modulus and can be used as subgrade filler.However,in order to ensure the stability of embankment,cover loess protection should be set on both sides of slope.Based on the finite element strength reduction method,the effects of the shear strength of fly ash,the thickness of cover soil and the shear strength of cover soil on the stability of circulating fluidized bed fly ash subgrade are analyzed.The results show that with the increase of maintenance days of circulating fluidized bed fly ash subgrade,its shear strength and subgrade stability will increase;with the increase of the thickness of the cover soil,the plastic zone in the subgrade gradually changes from the inside of the fly ash subgrade to the inside of the edging soil,the subgrade stability coefficient gradually decreases,and the appropriate thickness of the cover soil is 2.0 m～3.0 m;and improving the shear strength of the bound soil is helpful to improve the stability of the subgrade.
subgrade engineeringcirculating fluidized bed ashloess coversubgrade stabilitystrength reduction method
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