Prabhakar, B and Chakraborty, A.K. (2008) Application of numerical methods. Indian Mining & Engineering Journal , 47 (5). pp. 28-32. ISSN 0019-5944

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To design underground openings such as tunnels, pillars, panels, stope, cavern, rock slopes and others, is one of the vital challenges at present. Several factors affect the stability of underground openings such as rock properties and stresses in the rock mass, design geometry, rate of extraction and others. Any rational procedure for the design of openings, should include field, laboratory and theoretical studies of rock behavious. One of such design requirements of underground openings, involves stability analysis in which the stress distribution and the displacement of various points around the opening should be evaluated. Closed-form solutions are available for regular geometry shapes of the opening such as circular, rectangular and elliptical based on the theory of elasticity for idealized rock conditions. classical closed-form analysis, however, is based on two main assumptions namely the rock behaves as a continuum and other discontinuum. Numerical modeling, however, is essential for the rock behaves as discontinuum. This is advantageous for complex geometry and three dimensional numerical modeling. The paper also presents a case study of maneri bhali Hydel tunnel by applying one of the numerical methods. At the Dhanarigad site, up-stream face of tunnel has exhibited extremely difficult tunneling conditions. the closures were very high and rock loads appeared to be enormous. The supports got twisted very badly and the excavated portion near the face collapsed. Some collapsed portion had been cleared and fresh supports had been installed. These fresh supports have also experienced closures to the closures occurred soon after initial excavation. Due to continuous closures and heavy inrush of water, all installed steel supports were failed and buckled. Lastly, for completion, tunnel alignment has been changed. This paper presents a typical case study of hydel tunnel and its problems also.

Item Type: Article
Subjects: Blasting
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 14 Dec 2011 12:25
Last Modified: 14 Dec 2011 12:25

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