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通过天然沉积黏土的原状样与重塑样的压缩对比试验,揭示了屈服后土结构性的渐进性破损过程以及由常规ve-lgsσ曲线确定的压缩指数cC随固结压力呈非线性变化性状给实际工程沉降计算参数选取带来不便。采用vlg(1+e)-lgsσ双对数坐标表示方法,通过不同初始结构大小的黏土试验数据证实了vlg(1+e)-lgsσ压缩曲线在屈服前后段具有良好的线性关系,实现了结构屈服应力、屈服前后压缩指标有效统一确定。在该坐标体系下给出了考虑取样扰动影响的原位压缩曲线恢复方法,建立了结构性黏土的双线性压缩模型,结合文中与文献中试验数据给出了结构屈服应力与不排水强度、屈服后压缩指标与稳定指数SI和液限wL的经验关系。研究结果可为天然沉积土地基固结沉降计算参数的合理选取提供依据。
Through the compressive contrast test of the original and remodeled samples of natural sedimentary clay, the progressive failure process of soil structure after yielding and the non-linear variation of the compressive index cC determined by the conventional ve-lgsσ curve with the consolidation pressure are revealed Actual engineering settlement calculation parameter selection inconvenience. The vlg (1 + e) -lgsσ logarithmically coordinate method was used to demonstrate that the compressive curves of vlg (1 + e) -lgsσ have good linear relationship before and after yielding with different initial structural clay test data, and the structure Yield stress, compression indicators before and after yield effectively unified determination. In this coordinate system, the method of recovering in-situ compression curve considering the influence of sampling disturbance is given, and the bilinear compression model of structured clay is established. The yield stress and undrained strength of structure are given by combining with the experimental data in the paper. EXPERIMENTAL RELATIONSHIP BETWEEN COMPRESSION INDEX AND STABILITY INDEX SI AND LIQUID LIMIT wL AFTER SUGAR. The results provide the basis for the reasonable selection of the calculation parameters of the consolidation settlement of natural soils.