期刊
COMPUTERS AND GEOTECHNICS
卷 105, 期 -, 页码 249-264出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2018.10.006
关键词
Square tunnel; Rock mass; Hoek-Brown; Underground opening; Lower bound; Semidefinite programming
In this paper, the lower bound (LB) finite element limit analysis in conjunction with semidefinite programming (SDP) is developed and employed to investigate the stability of unlined square tunnels in Hoek-Brown (HB) material. Extensive parametric studies on the load factor of unlined square tunnels are conducted on practical ranges of the cover-depth ratio of tunnels, normalized uniaxial compressive strength of intact rock, geological strength index (GSI) and FIB material constant (m(i)). The presented results are useful for a reliable and accurate assessment of the stability of unlined square tunnels in rock masses in practice.
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