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Experimental investigation of noncoaxial behavior of natural granite residual soil
https://orcid.org/https://orcid.org/0000-0002-8165-2259
https://orcid.org/http://orcid.org/0000-0002-0283-4493
https://orcid.org/https://orcid.org/0000-0001-9654-8414
https://orcid.org/https://orcid.org/0000-0003-2462-1971
Noncoaxiality is critical for predicting accurately the constitutive relationships of soils. Although the noncoaxiality of sand and clay has been studied extensively, such information for residual soil is far from sufficient. The mechanical behavior of residual soil differs from that of sedimentary soil, thus the applicability of the existing results is yet to be confirmed. This paper reports systematic undrained hollow-cylinder torsional shear tests performed on specimens of natural granite residual soil (GRS). The tests involve shear paths of monotonic shear with fixed principal-stress direction (fixed-α) as well as rotation of the principal-stress direction at constant deviator stress (α-rotation). The results show that the noncoaxial behavior of GRS depends on the principal-stress direction as well as the deviator stress. In the fixed-α tests, the soil tends to become more coaxial when approaching an ultimate state. The higher deviator stress during the α-rotation tests results in reduced noncoaxiality, but no obvious reduction in noncoaxiality is induced by α-rotation. This paper correlates soil’s inherent anisotropy with its noncoaxial behavior. For sand, the initial and maximum noncoaxiality degree correlate well with the initial anisotropy, and two corresponding empirical relationships are proposed. However, they do not apply to natural GRS and soft clay. The ultimate noncoaxiality degree correlates poorly with the inherent anisotropy because of the damage to the latter. For GRS, the inherent anisotropy declines when soil particles rearrange during shear, which damages the bridge-form iron-bearing minerals.
Experimental investigation of noncoaxial behavior of natural granite residual soil
https://orcid.org/https://orcid.org/0000-0002-8165-2259
https://orcid.org/http://orcid.org/0000-0002-0283-4493
https://orcid.org/https://orcid.org/0000-0001-9654-8414
https://orcid.org/https://orcid.org/0000-0003-2462-1971
Noncoaxiality is critical for predicting accurately the constitutive relationships of soils. Although the noncoaxiality of sand and clay has been studied extensively, such information for residual soil is far from sufficient. The mechanical behavior of residual soil differs from that of sedimentary soil, thus the applicability of the existing results is yet to be confirmed. This paper reports systematic undrained hollow-cylinder torsional shear tests performed on specimens of natural granite residual soil (GRS). The tests involve shear paths of monotonic shear with fixed principal-stress direction (fixed-α) as well as rotation of the principal-stress direction at constant deviator stress (α-rotation). The results show that the noncoaxial behavior of GRS depends on the principal-stress direction as well as the deviator stress. In the fixed-α tests, the soil tends to become more coaxial when approaching an ultimate state. The higher deviator stress during the α-rotation tests results in reduced noncoaxiality, but no obvious reduction in noncoaxiality is induced by α-rotation. This paper correlates soil’s inherent anisotropy with its noncoaxial behavior. For sand, the initial and maximum noncoaxiality degree correlate well with the initial anisotropy, and two corresponding empirical relationships are proposed. However, they do not apply to natural GRS and soft clay. The ultimate noncoaxiality degree correlates poorly with the inherent anisotropy because of the damage to the latter. For GRS, the inherent anisotropy declines when soil particles rearrange during shear, which damages the bridge-form iron-bearing minerals.
Experimental investigation of noncoaxial behavior of natural granite residual soil
https://orcid.org/https://orcid.org/0000-0002-8165-2259
https://orcid.org/http://orcid.org/0000-0002-0283-4493
https://orcid.org/https://orcid.org/0000-0001-9654-8414
https://orcid.org/https://orcid.org/0000-0003-2462-1971
Noncoaxiality is critical for predicting accurately the constitutive relationships of soils. Although the noncoaxiality of sand and clay has been studied extensively, such information for residual soil is far from sufficient. The mechanical behavior of residual soil differs from that of sedimentary soil, thus the applicability of the existing results is yet to be confirmed. This paper reports systematic undrained hollow-cylinder torsional shear tests performed on specimens of natural granite residual soil (GRS). The tests involve shear paths of monotonic shear with fixed principal-stress direction (fixed-α) as well as rotation of the principal-stress direction at constant deviator stress (α-rotation). The results show that the noncoaxial behavior of GRS depends on the principal-stress direction as well as the deviator stress. In the fixed-α tests, the soil tends to become more coaxial when approaching an ultimate state. The higher deviator stress during the α-rotation tests results in reduced noncoaxiality, but no obvious reduction in noncoaxiality is induced by α-rotation. This paper correlates soil’s inherent anisotropy with its noncoaxial behavior. For sand, the initial and maximum noncoaxiality degree correlate well with the initial anisotropy, and two corresponding empirical relationships are proposed. However, they do not apply to natural GRS and soft clay. The ultimate noncoaxiality degree correlates poorly with the inherent anisotropy because of the damage to the latter. For GRS, the inherent anisotropy declines when soil particles rearrange during shear, which damages the bridge-form iron-bearing minerals.
Experimental investigation of noncoaxial behavior of natural granite residual soil
Acta Geotech.
Liu, Xinyu (author) / Zhang, Xianwei (author) / Kong, Lingwei (author) / Zhang, Shixing (author) / Wang, Gang (author)
Acta Geotechnica ; 18 ; 1289-1303
2023-03-01
15 pages
Article (Journal)
Electronic Resource
English
Cementation , Granite residual soil , Hollow-cylinder torsional shear test , Inherent anisotropy , Noncoaxial behavior , Shear strength Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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