An anisotropically elastoplastic solution to excavation responses of a circular opening considering three-dimensional strength.
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| Title: | An anisotropically elastoplastic solution to excavation responses of a circular opening considering three-dimensional strength. |
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| Authors: | Chen, Haohua1,2 (AUTHOR) howardchen@email.arizona.edu, Feng, Ce1 (AUTHOR), Li, Jingpei2 (AUTHOR) |
| Source: | Acta Geotechnica. Sep2022, Vol. 17 Issue 9, p3995-4011. 17p. |
| Subjects: | Initial value problems, Earth pressure, Excavation (Civil engineering), Soil particles, Petroleum engineering, Soil mechanics, Clay |
| Abstract: | Circular opening is commonly encountered in wellbore drilling of petroleum engineering, boring for cast-in situ pile installation, and tunneling excavation. This paper presents a rigorous solution for the elastoplastic responses of the anisotropic soft soil mass around a circular opening excavated under undrained and drained conditions. Both the anisotropic elastoplastic behavior and the 3D strength of the soft clay are incorporated in the present solutions. The well-established anisotropic critical state elastoplastic model S-CLAY1, which can represent the initial fabric anisotropy and stress-induced anisotropy of soft soil, is further modified by the Spatially Mobilized Plane criterion to consider the 3D strength of geomaterials. Then, the investigated problems, excavation of a circular opening under both short-term (undrained) and long-term (drained) conditions, are formulated as a system of first-order differential equations and are solved as initial value problems. The distributions of stress components and anisotropy parameters around the opening, the stress trajectory of a soil particle at the opening wall, as well as the stress–displacement curve at the opening wall are presented to investigate the elastoplastic responses of the opening. Extensive parameters show that the overconsolidated ratio and coefficient of earth pressure at rest (K0) have remarkable effects on the elastoplastic responses around a circular opening. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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