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室内试验成果表明,上海粘土的准先期固结压力较天然有效上复压力大得多。本文根据临界状态原理来讨论准先期固结压力对土特性的影响。通过室内三轴试验测定出上海粘土的正常固结线、临界状态线及天然强度线,并给出各线的表达式。从土的固结、强度、应力—应变关系及孔隙压力的变化规律说明天然地基具有轻度的准超压密特性。最后,我们认为在进行此类地基的沉降计算及稳定分析时,应考虑准先期固结压力的作用,以提高设计水平。
Indoor test results show that the quasi-early consolidation pressure of Shanghai clay is much greater than the natural effective recovery pressure. This paper discusses the effect of quasi-early consolidation pressure on soil properties based on the critical state principle. The normal consolidation line, critical state line and natural intensity line of Shanghai clay were determined by indoor triaxial tests, and the expressions of each line were given. From the soil’s consolidation, strength, stress-strain relationship, and pore pressure changes, the natural base has a slight quasi-ultra-compacting property. Finally, we believe that in the calculation of the settlement of such foundations and the stability analysis, the effect of quasi-early consolidation pressure should be considered in order to improve the design level.