Lushnikov V.N.,Engineering science Australian Mining Consultants Pty Ltd. AMC |
Sandy M.P.,Engineering science Australian Mining Consultants Pty Ltd. AMC |
Eremenko V.A.,Russian Academy of Sciences |
Kovalenko A.A.,Yakutniproalmaz Institute |
Ivanov I.A.,ALROSA JSC
Gornyi Zhurnal | Year: 2013
Understanding of processes and development scales of rock failure zone around the underground mine working is an important aspect during the assessment of rock massif stability and choice of the type of support for guaranteeing of mine personnel work safety. The following basic reasons of rock failure zone formation around the underground mine workings are defined: -cracking, caused by blasts; -brittle fracture of unmined massif under the influence of high concentration of stresses around the mine working; -shear fracture of massif along the heterogeneities and neogenic cracks. Drilling of measuring (observation) wells and drilling with selection and analysis of core-sample (or exploration (test) drilling) are the most acceptable methods of measuring of rock failure zone sizes during the underground mining. The staff of Australian Mining Consultants Pty Ltd (AMC) have developed the easy way of calibration of tensile elastic strain by the depth of rock failure zone range, mapped by means of tape-measure. The drafts of measured distances to cracks are combined with the contours of tensile strains, obtained by three-dimensional modeling by boundary elements method, using the Map3D program. Correspondence of tensile strains' contours to the drafts of distances to cracks is defined by variation of rocks' elastic properties (E and ). Criterion of fracture by tensile mechanism for certain mine area is defined as a result of carrying out of such calibration. Formation of rock failure zone around chambers, working excavation and worked-out area is complex, because, as a rule, ore bodies mining is carried out simultaneously on several floors in different order. Development of easy calibrated models makes it possible to do the mine operations planning with minimization of development processes of rock failure zones. This article shows the experience of numerical models calibration, which has the following content: - measurement and mapping of cracks in wells in the massif around mine working, chamber and working excavation; - comparison of obtained pictures of fracture in the form of system of cracks with contours of tensile strains, calculated by numerical modeling. Correctly calibrated models make it possible to carry out the reliable forecast of the depth of rock failure zone range on the stage of projecting of mining operations.
Kuznetsov N.M.,North-Eastern Federal University |
Semenov A.S.,North-Eastern Federal University |
Bebikhov Yu.V.,North-Eastern Federal University |
Rybnikov A.V.,ALROSA JSC
Gornyi Zhurnal | Year: 2014
This article is devoted to development and application of system of monitoring of electric power quality indicators at mining enterprises. There are considered the questions of provision of quality standards of electric power. There was defined the equipment of mining enterprises, which creates the electromagnetic interferences and makes a negative influence on electric power quality. There are set the tasks of monitoring of quality indicators. There are considered various means of measurement for the control quality. There are shown new standards, which regulate methods of measurement of electric power quality indicators. Underground diamond-bearing rocks' extraction mine was chosen as an object for creation and application of system of monitoring of electric power quality indicators. List of measured characteristics was defined according to requirement of the State Standard 13109-97. There are considered various schemes of connection of analyzer to three-phase circuit. There was carried out the analysis of results of researches and indicators of quality of electric power, obtained during the use of monitoring system.
Pismennyy A.V.,ALROSA JSC |
Chaadaev A.S.,ALROSA JSC |
Montyanova A.N.,Tekhnologii Zakladki Vyrabotannogo Prostranstva LLC |
Zyryanov I.V.,ALROSA JSC |
Kisilichin A.I.,ALROSA JSC
Gornyi Zhurnal | Year: 2013
Large-scale development of underground method of ore extraction, in connection with reaching of open pits' limiting contours, is the distinguishing characteristic of modern status of mining operations on large diamond deposits of Far North. This article describes the peculiarities, improvement and practice of stowing operations on diamond-bearing pipes «Internatsionalnaya» , «Aykhal» and «Mir». In particular, it is singled out, that for the relatively short period from the beginning of stowing operations, a new scientific-methodical approach to explanation of parameters of stowing and coal face operations was developed and realized on the Far North pits of «ALROSA» JSC. This approach consists in accounting of geothermal interference of artificial and rock massif by the development of extraction and stowing operations on deposits. Scientific-methodical provision of technologies of formation of stowing massifs is realized in the form of published technological regulations on production of stowing operations on «Aykhal», «Internatsionalnyy» and «Mir» pits. The following methods are included in the practice and are used on mines: methods of calculation of regulations of materials' consumption; methods of quality control of stowing massifs, including the non-fracture methods; method of calculation of junctions during the continuous breaking. The stowing compound compositions, where 30% of cement is replaced by homeland zeolite rocks, without loss of stowing durability, were developed, patented and implemented on «Mir» pit. There is proved the possibility of efficient and safe application of development systems with stowing in extreme conditions, as well as with negative temperatures of rock massif and mine air. The following factors are shown as priority directions of development of stowing operations on considered deposits: -possibility of complete exclusion of consumption of imported cement due to manufacturing of clinkerless stowing compounds on the basis of homeland materials; -optimization of stowing operations from the position of geomechanics; -expansion of the area of efficient usage of zeolite rocks as means of decreasing of cement consumption; -construction of water-proof stowing massif on the «Mir» pit as one of means of prevention of natural water inflows in the regions, where mining operations are carried out.