Title of Paper:Numerical modeling of failure process of underground tunneling considering the effect of support

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Date of Publication:2007-01-01

Included Journals:CPCI-S

Page Number:1376-+

Abstract:This paper outlines the construction process mechanics principle for analyzing the stability of underground opening and presents numerical simulation and prediction on the deformation and failure of the rock masses surrounding opening under excavating and support conditions. Stress redistribution induced by excavation of underground engineering results in the unloading zone in parts of surrounding rock masses. A micromechanics model has been proposed for brittle rock material undergoing irreversible changes of their microscopic structures due to existing of the support. Based on numerical modeling, a series of predicting plots are obtained. The numerical simulation and computation show that different schemes of construction have significant impact on underground opening stability and deformation. Therefore, the numerical analyses should be performed before construction to select optimal construction schemes, especially for poor rock condition. Based on the results of the in situ stress measurements and other field investigations as well as numerical tests, a numerical modeling analysis by RFPA methods was completed. The analysis proved the feasibility of the support and provided a series of suggestions on maintaining stability of the underground opening. The part of lining should be strengthened specially.