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天然沉积土由于结构性的影响,通常具有与相应重塑样截然不同的力学性质。利用重塑土的固有特性作为评价参考基准,通过对太湖湖沼相典型沉积土的原状样和重塑样的固结压缩试验,从压缩特性方面探讨了如何评价土结构性对天然沉积土力学性状的影响。试验结果表明:土体结构性使天然土体具有的结构屈服应力对其变形性状起控制作用,屈服应力比YSR可判断土结构性的强弱;并与度量原位状态土体结构性抗力的应力灵敏度Sσ、衡量土的结构性对变形影响的稳定指数SI结合起来,作为定量分析和评价土结构性影响的指标;评价指标揭示出太湖湖沼相天然沉积土在沉积过程以及沉积后受到土结构性的影响,具有高位结构性。同时试验结果验证了该评价方法能够适合具有不同结构形式的天然状态土体。
Naturally-deposited soils usually have a completely different mechanical property from the corresponding remodeled samples due to their structural properties. By using the inherent properties of remolded soils as the reference for evaluation, this paper discussed the compressive characteristics of undisturbed compressive properties of the typical soils in the lake and the remodeling behavior of remolded soils. Impact. The test results show that the structural yield stress of natural soils plays a controlling role on the deformation properties of the soils, and the yield stress ratio YSR can determine the strength of the soil structure. The stress sensitivity Sσ, a measure of the structural stability of soil, is combined with the stability index (SI) of deformation effects as an index for quantitative analysis and evaluation of structural effects of soils. The evaluation indexes reveal that the natural sediments in the lake facies of Taihu Lake are affected by the soil structure The impact of sex, with high structural. At the same time, the test results verify that the method can be applied to natural state soil with different structure.