Long-term hydromechanical behaviour of a deep cavity taking into account a simplified sequence of life stages. (April 2023)

• Record Type: Journal Article
• Authors: Sun, Y.; Wong, H.; Pardoen, B.; Deleruyelle, F.; Dufour, N.
• Is Part Of: Computers and geotechnics. Volume 156(2023)
• Publication Date: 2023-04
• Subjects: Viscoplasticity -- Dilation -- Clayey rock -- Quasi-analytical -- Excavation Damaged Zone; Engineering geology -- Data processing -- Periodicals; Soil mechanics -- Data processing -- Periodicals; Rock mechanics -- Data processing -- Periodicals; 624.1510285
• DOI: 10.1016/j.compgeo.2023.105256
• Languages: English
• ISSNs: 0266-352X

Abstract

Abstract: This study first presents an analytical approach for the hydromechanical behaviour of a deep spherical cavity during different stages of its simplified life cycle. The underground cavity is assumed to be excavated in a dilatant poro-viscoplastic rock mass, and viscoplasticity is modelled based on the Perzyna's overstress concept. The dilation is incorporated by assuming that the volumetric viscoplastic strain rate is a linear function of the Frobenius norm of the deviatoric plastic strain rate. Some numerical examples are performed to examine the applicability of the model. Then, a sensitivity analysis is conducted on the time-dependent development of the Excavation Damaged Zone (EDZ) around an unsupported deep cavity. The von Mises equivalent strain is used as a criterion to assess the time–dependent extension of the damaged area. The conclusions provide some useful guidelines for the engineering design of underground openings.