Abstract
Facing the problem of the expropriation of the Shipitull village and the non-advancement of mining activity in the direction of the frontal work for the removal of the clay overburden for the use of coal, geo-mechanical drilling was performed to determine the most accurate physical-mechanical parameters to calculate the height of the partial and generals slopes with the safety factor Fs> 1.2, to create optimum conditions for the use of the detected coal reserves of 15 million tons of coal with the general 18° degree angle with safety factors Fs ≥ 1.27 according to the geotechnical standards. As the basis for calculating the slopes were taken physical-mechanical drilling parameters that were realized in 2015-2017, the tests were performed in the geotechnical laboratory at the INKOS Institute which is licensed to ISO 9001/2015 according to geotechnical standards. Based on the obtained results, statistical processing was performed for the classified parameters (physical) and the mechanical parameters obtained with the triangle test, the direct test and the tensile test. By comparing the physicochemical parameters based on the drilling of 2015 and 2017, there is change of values of angle I0 and cohesion C in the lithological layers due to the presence of moisture. The calculations were carried out with Slide v6 and Geo5 Fine software. Two methods were used during calculation: Circular and Polynomial methods for partial angle of height (h)=30 m and angle (α)=48° with the safety factor Fs<1 and for a general angle of height (h)=55 m with angle (α)=13° with current useable reserves of 6.8 million tons of coal having Safety factor Fs ≥ 1.27.
Highlights
The area where research for the removal of coal coverings has been conducted and the possibilities for coal exploitation consist of a surface area of 4 km2
Due to the change of the parameters, statistical processing of the physical and mechanical parameters with the safety factor permissible according to the geotechnical standards was done to preserve the stability of the mine and at the same time the Shipitull village, where the importance and purpose of this work was the use of coal without risking the inhabitants of the village
While the remaining reserves of 6.2 million tons of coal can be exploited only when the expropriation of the Shipitull village is done based on the low, the mining activity in the village is started, creating technological conditions for operations, each time preserving the factor safety according to the geotechnical criteria according to the Table 1 [2]
Summary
The area where research for the removal of coal coverings has been conducted and the possibilities for coal exploitation consist of a surface area of 4 km. Due to the change of the parameters, statistical processing of the physical and mechanical parameters with the safety factor permissible according to the geotechnical standards was done to preserve the stability of the mine and at the same time the Shipitull village, where the importance and purpose of this work was the use of coal without risking the inhabitants of the village. While the remaining reserves of 6.2 million tons of coal can be exploited only when the expropriation of the Shipitull village is done based on the low, the mining activity in the village is started, creating technological conditions for operations, each time preserving the factor safety according to the geotechnical criteria according to the Table 1 [2]
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