Strain Gradient Model of Zonal Disintegration of Rock Mass near Deep-Level Tunnels
C. QI1, K. LI1,2, J. BAI3, A. I. CHANYSHEV4, P. LIU1
1Beijing University of Civil Engineering and Architecture, Beijing, 100044 China
2Defense Engineering Institute, Nanjing, 210007 P R China
3University of South Wales, Pontypridd, CF37 1DL, UK
4Chinakal Institute of Mining, B, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: выработка глубокого залегания, зональная дезинтеграция, градиентная деформационная модель, deep-level tunnel, rock mass, zonal disintegration, strain gradient model
Abstract
This paper presents one strain gradient model of zonal disintegration of rock mass near deep level tunnel. The governing equations and boundary conditions of the model are established. Numerical methods (quasi-Newton method and shooting method) are adopted to solve the obtained fourth-order equilibrium equations with higher order boundary conditions in terms of displacement. The stress field in elastic and plastic zones is obtained. The effects of model parameters on stresses distribution in surrounding the tunnel rock mass are examined. The necessary conditions for the formation of zonal disintegration are elucidated.
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