Journal
COMPUTERS AND GEOTECHNICS
Volume 126, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2020.103724
Keywords
Unlined rock cavern; Viscoelastic parameters; Displacement back analysis; Heterogeneity; Successive linear estimator
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Funding
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUG170686, G1323520270]
- Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education
- National Natural Science Foundation of China [41807264, 41672313, 41807240]
- U.S. NSF [EAR1931756]
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A displacement back analysis algorithm is developed, considering the time-dependent effect of the rock mass. It can map spatially distributed the first elastic modulus (E-1), viscidity coefficient (eta(1)), and the second elastic modulus (E-2) of the Kelvin-Voigt viscoelastic constitutive model (VCM) and the Poynting-Thomson VCM in a rock mass by fusion of the observed displacement data from the excavation of an unlined rock cavern. The algorithm is tested and validated using numerical experiments with a synthetic heterogeneous rock mass. The results of the experiments show that this approach yields unbiased estimates of E-1, eta(1), and E-2 fields and quantifies their uncertainty. Further, the estimated fields closely predict shear strain distribution and displacements field in the example.
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