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选取黄石与青岛地区软土为研究对象,进行高压固结、固结不排水剪切等结构性试验。分析土结构性对固结特性、固结系数、应力-应变特性、强度包线、孔隙水压力特性的影响,利用微观结构变化对其进行了解释。结果表明,土的结构性越强,随着压力的增加,原状土的Cv降低的幅度也越大。围压小于σk时,应力-应变曲线上出现应力平台;围压高于σk时,曲线上没有明显的应力平台。结构极疏松、孔隙比大的软土,剪切过程中可能出现剪缩的情况。U-q曲线表现出平缓—陡升—平缓的阶段性。
The soft clay in Yellowstone and Qingdao areas was selected as the research object, and structural tests such as consolidation by high pressure and consolidation by undrained shear were carried out. The influence of soil structure on the consolidation characteristics, consolidation coefficient, stress-strain characteristics, strength envelope and pore-water pressure characteristics was analyzed. The microstructure was used to explain the effect of soil structure. The results show that the stronger the structure of soil, the greater the decrease of Cv of undisturbed soil with the increase of pressure. When the confining pressure is less than σk, the stress platform appears on the stress-strain curve; when the confining pressure is higher than σk, there is no obvious stress platform on the curve. Very loose structure, large void ratio of soft soil, shearing process may occur in the case of shear contraction. The U-q curve shows a gentle-steep-gentle phase.