Slope Stability Analysis of Solidified Shield Tunneling Waste Soil
Shield tunneling produces a large amount of waste soil with a high water content,some of which are solidified and accumulat-ed in the waste disposal site.The aim of this paper is to investigate their slope stability problems.Existing triaxial shear tests carried out on solidified waste soils show stress-strain curves with an apparent strain-softening characteristic,which was modeled using the strain-softening Mohr-Coulomb constitutive model.The slope stability coefficient was calculated using the strength reduction method,in which the softening relationship of the strength parameters with the plastic strain was handled by applying a total synchronous reduction.The calculation shows that the slope slip surface is significantly influenced by the strength parameters and the constitutive model.Parametric analyses of the effect of slope gradient,drainage condition,and strength parameters on the slope stability factor were carried out.The results show that both in-creasing the slope gradient and the degree of saturation of the slope significantly reduce the slope safety factor;the slope safety factor ob-tained by considering the soil strain softening is between the results of the two cases directly adopting,respectively,the peak and residual values of the soil strength parameters.The methodology used in this research allows for more precise prediction of the factor of safety and the position of the sliding surface of slopes composed of consolidated waste soil.
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