Deformation Characteristics of Fly Ash Cement Soil
The Yanpingba Tunnel's fly ash stratum soil was selected as the base material for this study.The stress-strain properties,deformation behavior,and failure modes of fly ash cement soil were investigated using unconsolidated and undrained triaxial tests with varying cement mixing ratios,confining pressures,and curing ages.The results indicate that with an increase in cement mixing ratio and curing age,the strain softening of fly ash cement soil specimens under the same confining pressure becomes more pronounced,while the brittleness increases and strength decreases rapidly after failure.The confining pressure has a significant impact on the strain,peak strength,and residual strength of the fly ash cement soil specimen at failure,with an increase in confining pressure leading to a corresponding increase in these values.The secant modulus E50 was found to increase with increasing cement mixing ratio,confining pressure,and curing age.The results presented in this paper provide valuable insights for the design of cement-soil rotary jetting piles in engineering applications.
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