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Assessment of the failure mechanism of a highwall slope under spoil pile loadings at a coal mine
Abstract The design of a highwall in coal mining involves the consideration of many factors. The evaluation of a lignite strip coal mine at Yatagˇan in Southwest Turkey has provided an opportunity to combine both qualitative and quantitative factors in highwall design. In this paper an attempt has been made to illustrate an instability problem that occurred in a highwall externally loaded by a spoil pile in the southern part of the pit. Geotechnical data with slope monitoring information were evaluated, and shear strength of the highwall material was determined using non-linear failure criterion for jointed rock masses in conjunction with rock mass classification. Using a model for the loaded highwall, these studies were complemented by limit-equilibrium back analysis and finite element stress analysis incorporating the effect of the spoil pile loadings. The results of the back analysis and numerical modelling, which confirmed each other, and detailed examination of geotechnical data with movement monitoring records indicate that the instability occurred by shallow seated circular failures mainly caused by the stresses exerted by the pile. The progressive failure developed through a combination of sliding along structural discontinuities and failure through the moderate quality, low strength rock mass. In addition, the calculated slip surfaces match the actual slip surfaces, and the non-linear shear strength failure criterion confirmed that the mobilized shear strength appears realistic for design purposes.
Assessment of the failure mechanism of a highwall slope under spoil pile loadings at a coal mine
Abstract The design of a highwall in coal mining involves the consideration of many factors. The evaluation of a lignite strip coal mine at Yatagˇan in Southwest Turkey has provided an opportunity to combine both qualitative and quantitative factors in highwall design. In this paper an attempt has been made to illustrate an instability problem that occurred in a highwall externally loaded by a spoil pile in the southern part of the pit. Geotechnical data with slope monitoring information were evaluated, and shear strength of the highwall material was determined using non-linear failure criterion for jointed rock masses in conjunction with rock mass classification. Using a model for the loaded highwall, these studies were complemented by limit-equilibrium back analysis and finite element stress analysis incorporating the effect of the spoil pile loadings. The results of the back analysis and numerical modelling, which confirmed each other, and detailed examination of geotechnical data with movement monitoring records indicate that the instability occurred by shallow seated circular failures mainly caused by the stresses exerted by the pile. The progressive failure developed through a combination of sliding along structural discontinuities and failure through the moderate quality, low strength rock mass. In addition, the calculated slip surfaces match the actual slip surfaces, and the non-linear shear strength failure criterion confirmed that the mobilized shear strength appears realistic for design purposes.
Assessment of the failure mechanism of a highwall slope under spoil pile loadings at a coal mine
Ulusay, R. (author) / Aksoy, H. (author)
Engineering Geology ; 38 ; 117-134
1994-08-03
18 pages
Article (Journal)
Electronic Resource
English
Assessment of the failure mechanism of a highwall slope under spoil pile loadings at a coal mine
| Online Contents | 1994
Assessment of the failure mechanism of a highwall slope under spoil pile loadings at a coal mine
| British Library Online Contents | 1994
An initial evaluation of spoil pile failure in a strip coal mine
| TIBKAT | 1978
Highwall design for a New Zealand opencast coal mine
| Elsevier | 1985
An improved reliability method applied to coal mine spoil pile stability
| British Library Conference Proceedings | 1991