Abstract
Because of complex mechanical properties and deformation mechanism, gravel soil mixture is an important medium of concern in the field of geotechnical engineering. Based on the continuous-discontinuous coupling algorithm formed by the structure shell elements and the particle discrete element method (PFC3D), the soft servo loading of the sample is realized, and the typical triaxial compression test data are used to calibrate mesoscale parameters. Furthermore, the numerical tests under different rock contents and confining pressure are carried out. The change rule of shear strength of mixed medium is discussed. It shows that the continuous-discontinuous coupling algorithm achieves a good effect in reflecting the deformation process. Under the mechanism of the flexible servo, the failure mode of the sample takes on drum-failure mode, and the internal of the damaged sample forms an obvious asymmetric X-shaped shear band. With the increase of stone content, the internal friction angle and cohesive force distribution of the sample have certain discreteness, but on the whole, the internal friction angle and cohesive force increase with the increase of stone content. The results can provide a reference for the parameter determination of mixed mediums such as gravel soil.
Highlights
Gravel soil mixed strata are generally formed by Quaternary alluvial deposits and ice water deposits, which are widely distributed in riverbeds, floodplains, and low terraces; generally derived from the diluvium of the Quaternary alluvium; and formed by the outwash deposits
With the development of computer software, scholars analyze the mechanical properties of miscellaneous fill from the microperspective by numerical simulation method; the influence of rock content, water content, density, gravel shape, and other factors on the strength characteristics of miscellaneous fill was studied; and the corresponding prediction model is established to Geofluids laser scanning technology and random construction method
Biaxial test and direct shear test of the mixed medium are simulated by two-dimensional particle flow, and influence rule of rock content, shape, and roughness of block stone on friction angle and cohesion in miscellaneous fill was analyzed [15]
Summary
Gravel soil mixed strata are generally formed by Quaternary alluvial deposits and ice water deposits, which are widely distributed in riverbeds, floodplains, and low terraces; generally derived from the diluvium of the Quaternary alluvium; and formed by the outwash deposits. With the development of computer software, scholars analyze the mechanical properties of miscellaneous fill from the microperspective by numerical simulation method; the influence of rock content, water content, density, gravel shape, and other factors on the strength characteristics of miscellaneous fill was studied; and the corresponding prediction model is established to Geofluids laser scanning technology and random construction method. Biaxial test and direct shear test of the mixed medium are simulated by two-dimensional particle flow, and influence rule of rock content, shape, and roughness of block stone on friction angle and cohesion in miscellaneous fill was analyzed [15]. The flexible loading characteristics of rubber film on confining pressure in the indoor triaxial test cannot be reasonably simulated by using the rigid cylindrical wall in the discrete element. A discrete element numerical model of the gravel-soil mixture is established based on three-dimensional
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