Numerical modeling of a highly explosive source in an elastic-brittle rock mass

Abstract. Calcareous mountainous areas are highly prone to geohazards, and rockslides play an important role in cliff retreat. This study presents three examples of failures of limestone cliffs with subhorizontal bedding in the southwestern calcareous area of China. Field observations and numerical modeling of Yudong Escarpment, Zengzi Cliff, and Wangxia Cliff showed that pre-existing vertical joints passing through thick limestone and the alternation of competent and incompetent layers are the most significant features for rockslides. A "hard-on-soft" cliff made of hard rocks superimposed on soft rocks is prone to rock slump, characterized by shearing through the underlying weak strata along a curved surface and backward tilting. When a slope contains weak interlayers rather than a soft basal, a rock collapse could occur from the compression fracture and tensile split of the rock mass near the interfaces. A rockslide might shear through a hard rock mass if no discontinuities are exposed in the cliff slope, and sliding may occur along a moderately inclined rupture plane. The "toe breakout" mechanism mainly depends on the strength characteristics of the rock mass.

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Application of numerical modeling and genetic programming to estimate rock mass modulus of deformation

International Journal of Mining Science and Technology ◽

10.1016/j.ijmst.2013.08.018 ◽

2013 ◽

Vol 23 (5) ◽

pp. 733-737 ◽

Cited By ~ 18

Author(s):

Ebrahim Ghotbi Ravandi ◽

Reza Rahmannejad ◽

Amir Ehsan Feili Monfared ◽

Esmaeil Ghotbi Ravandi

Keyword(s):

Numerical Modeling ◽

Rock Mass ◽

Genetic Programming ◽

Modulus Of Deformation ◽

Rock Mass Modulus

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A Novel Closed-Form Solution for Circular Openings in Generalized Hoek-Brown Media

Mathematical Problems in Engineering ◽

10.1155/2014/870835 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Qing Xiang Meng ◽

Wei Wang

Keyword(s):

Rock Mass ◽

Closed Form ◽

Hydrostatic Stress ◽

Yield Criterion ◽

Closed Form Solution ◽

Form Solution ◽

Preliminary Design ◽

Exact Integration ◽

Sensitive Factor ◽

Brittle Rock Mass

A novel closed-form solution is presented in this paper for the estimation of displacements around circular openings in a brittle rock mass subject to a hydrostatic stress field. The rock mass is assumed to be elastic-brittle-plastic media governed by the generalized Hoek-Brown yield criterion. The present closed-form solution was validated by employing the existing analytical solutions. Results of several example cases are analyzed to show that, with the simplified assumption, a novel closed-form solution is derived and found to be in an excellent agreement with those obtained by using the exact integration method with mathematical software. Parametric sensitivity analysis is carried out and the parameterartends to be the sensitive factor. As a closed-form solution that does not require transformation technique and the use of any numerical method, this work can provide a better choice in the preliminary design for circular opening.

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