Characterization of initial structural strength of soils and its numerical determination method
[Objective]Quantitative analysis of geotechnical material structures is of great significance for identifying the engineer-ing properties.To describe the structural strength of soils,[Methods]the relationship between traditional pre-consolidation pres-sure and that of structural geotechnical materials is firstly analyzed,and the initial structural strength characterization of geotech-nical materials is presented.Following this,a lateral compression test was conducted on Hantai loess from Qinghai Province,and its initial structural strength was obtained based on a modified version of the Casagrande numerical determination method.Subse-quently,a calculation framework for assessing the initial structural strength of geotechnical material is developed and its validity is confirmed through examples.[Results]The results indicate that,the initial yield stress under confined compression is a repre-sentation of the initial structural strength of geotechnical material.The strength of unstructured soil is only contributed by physical compaction.Conversely,the strength of structured soils and sedimentary rocks originates from both physical compaction and dia-genesis.The proposed compression-hard boundary condition can be used to select a more suitable fitting model for the compres-sion curve,which is the pore ratio decreases consistently with the logarithmic increase of vertical stress,when this stress lies be-tween 0 and the last order load.[Conclusion]The enhanced numerical determination method proposed in this study exhibits high accuracy and applicability.This research provides a rapid and precise approach for determining the initial structural strength of geotechnical materials,thereby laying a solid theoretical foundation for the design in geotechnical engineering.
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