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非饱和湿陷性土与湿胀性土分别具有亚稳态孔隙比结构和超稳态孔隙比结构,广义吸力是维持这种结构稳定的主要因素。随着广义吸力的丧失,两种结构均处于一个不稳定的孔隙状态,土体会向一个更加稳定的孔隙比结构发展。超孔隙比结构孔隙比增大,土体产生膨胀,亚稳孔隙比减小,土体产生收缩。基于这一稳态孔隙比理论,建立了广义吸力丧失引起的孔隙比的增量方程,来统一考虑非饱和土的湿陷性和湿胀性变形特性,并通过经典试验数据验证了增量方程的合理性。
Unsaturated collapsible soil and wetting expansive soil respectively have a metastable pore ratio structure and a super stable pore ratio structure. The generalized suction is the main factor to maintain the stability of this structure. With the loss of generalized suction, both structures are in an unstable pore state, and the soil will develop toward a more stable pore structure. The ratio of excess pore to the structure increases, the soil expands, the ratio of metastable porosity decreases, and the soil shrinks. Based on the steady-state porosity ratio theory, the incremental equations of void ratio caused by the loss of generalized suction are established to consider the collapsibility and wetting deformation characteristics of unsaturated soils uniformly. The incremental equations The rationality.