Mining of Mineral Deposits

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Analysis of the stress deformed state of rocks around the haulage roadway of the Beskempir field (Kazakhstan)

Abdrakhman Begalinov1, Talgat Almenov1, Raissa Zhanakova1, Bakytbek Bektur1

1Satbayev University, Almaty, 50013, Kazakhstan

Min. miner. depos. 2020, 14(3):28-36

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      Purpose. To perform research and detailed analysis of the stress deformed state of rocks around the haulage roadway based on the numerical modeling with the purpose to select the rational type and design of the haulage roadway support at the Beskempir field.

      Methods. A comprehensive research method has been used: review and generalization of references related to the study of the stress deformed state of a rock mass, improvement of the walling technology, in-situ and laboratory tests in the research and testing of rock samples strength; application of mathematical statistics and processing of experimental data using software products. The numerical modeling of the stress deformed state was done using the Examine 2D application with due account for the shape of broken rocks area, which is a 138х138х138 m regular triangle. Barton’s Q-system was used to the RQD assessment.

      Findings. The numerical modeling of the stress deformed state of rocks in the tectonic fault zone of the haulage roadway at +230 m was performed, and the rock mass deformation zones were defined around the mine contours. The charts showing displacement of roof rocks and walls of the haulage roadway were built, where it was established that the maximum displacement was manifest over the tectonic fault zone. The following zones were identified: the rock mass instability zones, the rock mass instability zones with due account for its fracturing, the zones of stable and unstable rock masses of the haulage roadway. It was established that 41.6% of the working with the fault zone is unstable, and 58% of it is a more stable part. It is proposed to divide the haulage roadway into three sections depending on the rock stability with a certain type of support.

      Originality.. Based on the study of the stress deformed state of the rock mass in the conditions of the Beskempir field, site-specific unstable sections were identified. They ensured the selection of the support design with adjustable resistance.

      Practical implications. The application of support with adjustable resistance depending on the rock mass stability ensures minimization of costs for roadway support, maintenance of extensive sections of the working as well as enhanced mining safety in specific mining and geological conditions of the Beskempir field.

      Keywords: stress deformed state, rock mass, support, fault zone, support design, construction, tectonic faults, underground workings


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