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Abstract
Theme of master's work:
“Determination of the regularities and factors of the disorder mechanical (straight and deformation) properties of the a file of rocks in zones of influence of the disturbance”
Leader of work: professor, doc. teach. ski. Nazimko V. V.
The general data
The increasing requirement for coal leads to necessity to develop coal layers in difficult mountain-geological conditions, and also to conduct their exploiting on the big depths. Underground exploiting of mineral deposits is accompanied with shifting a file of rocks and a terrestrial surface. It is called a result of filling of the developed space. In a zone of influence of the developed space there is a subsidence of a terrestrial surface which negatively influences safety of the artificial and natural objects existing on a terrestrial surface before conducting of clearing jobs, or erected after undermining surfaces. Thus influence of dredging of coal on a status of a terrestrial surface is marked even at depth of extraction of coal of 1000 m and more. It is natural, that owing to various dissimilarity in a file there is a situation when it is impossible to establish authentically possible shifting a terrestrial surface. In case of a prediction and an estimation disturbance a terrestrial surface uncertainty is connected with is inadmissible the big errors of calculations of parameters trough shifting. Therefore the forecast of expected indicators shifting continues to remain rather actual problem in connection with a number of unresolved problems. One of such problems is connected with that actual distributions of indicators shifting a terrestrial surface at it undermining essentially differ from expected which are defined by standard techniques. Unfortunately the majority of existing techniques consider process shifting as determined. In turn the knowledge of expected sizes convergence and deformations of a terrestrial surface will allow to plan conducting mountain jobs so that as a result to receive smaller expenses for liquidation of consequences or to develop more effective actions for protection of constructions on a terrestrial surface. Studying of physicomechanical properties of a file of rocks and establishment of their influence on expected parameters trough shifting is very important.More often for the decision of such problems use a method of final elements, a method of final differences, a method of boundary elements, a method of discrete elements. All specified methods state today the determined estimation of sizes convergence and deformations of a terrestrial surface. In all cases reliability of results of the forecast is checked by comparison of settlement indicators shifting with measurement actual in natural conditions. In most cases researchers try to explain casual deviations of settlement sizes of indicators shifting from actual measured by measurement technique errors, and, in particular, distance influence between reference points on results of definition of such derivatives of subsidence, as inclinations, curvature and so on. The given subject of job has been chosen for perfection of a technique of the account of natural disorder of indicators shifting and deformations of a terrestrial surface.
The purpose and job problems
The purpose of the given job follows from the mentioned above, which consists in an establishment of laws and indicators of disorder mechanical (straight and deformation) properties of a file of rocks. During performance of the given job it is necessary to solve the following problems: • To estimate disorder elastic and straight parameters of a file of rocks; • To prove model and to spend stochastic modelling of process shifting a file of rocks at different sets of casual values of physicomechanical indicators of a file of rocks; • To establish law of change of disorder convergence and deformations in limits trough shifting from a single lava; • To develop recommendations about the account of practical results of researches.Scientific novelty and practical result
In the given job separate influence of stochasticity deformation, straight properties of rocks and their joint influence on parameters trough shifting in a vicinity of a single lava for the first time is investigated.Laws of distribution of disorder of parameters shifting concerning the centre trough shifting will be a result established, that will allow to raise reliability of the forecast of parameters shifting, at the expense of use of the correction factors considering the stochastic nature of durability of rocks.
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