The analysis of radial displacements occurring near the face of a circular opening in weak rock mass

• Published in: International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 47; no. 5; pp. 771 - 783
• Main Authors: Basarir, H., Genis, M., Ozarslan, A.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.07.2010; Elsevier
• Subjects: Applied sciences; Buildings. Public works; Computation methods. Tables. Charts; Construction; Exact sciences and technology; Finite difference; Geotechnics; Longitudinal deformation profile; Mathematical analysis; Mathematical models; Normalized radial displacement; Numerical modeling; Regression; Response surfaces; Rock; Rock mass rating (RMR); Soil investigations. Testing; Stresses; Structural analysis. Stresses; Weak rock; Numerical modeling; Finite difference; Normalized radial displacement; Rock mass rating (RMR); Longitudinal deformation profile; Deformation; Rock mass; Modeling; Displacement; Circular aperture; Properties of materials; Numerical simulation; Application; Finite difference method
• ISSN: 1365-1609; 1873-4545
• DOI: 10.1016/j.ijrmms.2010.03.010

The effect of opening size, rock properties and stress conditions on the radial displacements ahead and behind of the advancing face of a circular opening is one of the most important topics in civil and mining engineering. In this paper we develop a prediction system for radial displacements around the face of an opening by combining rock mass rating classification system, a three dimensional finite difference code and multiple regression modeling. Predictive equations and response surfaces for rock mass response are proposed. By using these equations and response surfaces, it is possible to assess radial displacements around the face and to construct the longitudinal deformation profile of a circular opening with different diameters excavated in weak rock mass under different stress conditions. The predictive equations were validated by means of statistical tests and analytical solution. Proposed response surfaces and equations can provide the basis of guiding the design and construction of underground openings.