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工程中如何考虑复杂应力路径对地基土压缩性状的影响是岩土工程中一个关键的问题。然而目前土体压缩性状的研究通常采用一维压缩和三向等压压缩试验,没有考虑应力路径的影响。通过对天然沉积土进行不同应力路径下的GDS三轴压缩试验,研究不同应力比对天然沉积土压缩性状的影响规律。结果表明:不同应力路径下天然沉积结构性土的平均结构屈服应力和结构屈服后的压缩性参数均先随应力比的增大而增大,达到最大值后又随着应力比的进一步增大而减小。通过对比分析不同应力路径下的GDS三轴压缩屈服性状与一维压缩屈服性状,得出天然沉积土的静止土压力系数在屈服过程中并非常数,而是呈现由小到大的变化,在屈服后趋于恒定。
How to consider the impact of complex stress paths on the compressibility of foundation soil is a key issue in geotechnical engineering. However, at present, the research on soil compressive properties usually adopts one-dimensional compression and three-dimensional isostatic compression tests without considering the influence of stress paths. Through the GDS triaxial compression tests of natural sediment under different stress paths, the effects of different stress ratios on the compressive properties of natural soils were studied. The results show that both the mean structural yield stress of natural soils and the compressive parameters after structural yielding increase with the increase of stress ratio under different stress paths, and then increase with the increase of stress ratio And reduce. Through comparative analysis of the triaxial compression yielding characteristics and the one-dimensional compression yielding characteristics under different stress paths, it is concluded that the static earth pressure coefficient of natural soils is not constant in the yielding process, but shows a small to large change in After yield tends to be constant.