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通过在屈服准则和剪胀性方程中引入材料状态参数,建立了一个与材料状态相关的本构模型,用于模拟不同初始孔隙比和围压下土体的应力-应变关系。基于二阶功理论,建立了饱和土体静态液化失稳理论判别准则。通过预测一系列饱和松砂三轴不排水试验结果,验证了所建立的本构模型及判别预测准则的合理性。分析结果表明,静态液化发生于土体硬化阶段,静态液化触发伴随着剪应力达到峰值,其后剪应力降低且孔隙水压力持续增长。进一步地,模拟了充分降解的城市固体废弃物在不排水条件下的应力-应变特性,并预测到了潜在失稳线及静态液化触发点。
By introducing material state parameters into the yield criterion and dilatancy equation, a constitutive model related to material states was established to simulate the stress-strain relationship of soils with different initial void ratios and confining pressure. Based on the second order theory, the criterion of static liquefaction instability of saturated soil is established. By predicting a series of three-axis undrained saturated loose sand test results, the established constitutive model and the rationality of discriminant prediction criterion are verified. The results show that the static liquefaction occurs in the soil hardening stage, the static liquefaction triggering reaches the peak value with the shear stress, then the shear stress decreases and the pore water pressure continues to increase. Further, the stress-strain characteristics of fully degraded municipal solid waste under undrained conditions were simulated, and potential destabilization lines and static liquefaction triggering points were predicted.