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Evaluation of mine scale longwall top coal caving parameters using continuum analysis

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Mining Science and Technology 2011年第6期21卷 787-796页

作者： manoj khanal Deepak Adhikary Rao Balusu Earth Science and Resource Engineering Commonwealth Scientific and Industrial Research OrganizationQueensl and Center for Advanced Technology1Technology CourtPullenvaleQLD4069Australia

A mine-scale analysis of Longwall Top Coal Caving (LTCC) is performed using a continuum mechanics finite element solver called COSFLOW. The uniqueness of COSFLOW is that it incorporates Cosserat continuum theory in its formulation for describing the load deformation of bedded rocks. It is shown that such a continuum based code is valuable for assessing the feasibility of introducing LTCC in any mine. Various LTCC parameters, for example chock convergences, top coal failure behavior, strata cavingmechanism, abutment stresses and vertical stresses, were evaluated for a mine using COSFLOW.

关键词：综放开采技术连续分析技术参数评价矿井 LTCC 连续介质力学连续理论

Numerical analysis and geotechnical assessment of mine scale model

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International Journal of Mining Science and Technology 2012年第5期22卷 693-698页

作者： khanal manoj Adhikary Deepak Balusu Rao Earth Science and Resource Engineering Commonwealth Scientific and Industrial Research OrganizationQueensland Center for Advanced TechnologyTechnology CourtPullenvale QLD 4069Australia

Various numerical methods are available to model,simulate,analyse and interpret the results;however a major task is to select a reliable and intended tool to perform a realistic assessment of any *** a model to be a representative of the realistic mining scenario,a verified tool must be chosen to perform an assessment of mine roof support requirement and address the geotechnical risks associated with longwall *** dependable tools provide a safe working environment,increased production,efficient management of resources and reduce environmental impacts of *** various methods,for example,analytical,experimental and empirical are being adopted in mining,in recent days numerical tools are becoming popular due to the advancement in computer hardware and numerical *** rules based on past experiences do provide a general guide,however due to the heterogeneous nature of mine geology(i.e.,none of the mine sites are identical),numerical simulations of mine site specific conditions would lend better insights into some underlying *** paper highlights the use of a continuum mechanics based tool in coal mining with a mine scale *** continuum modelling can provide close to accurate stress fields and *** paper describes the use of existing mine data to calibrate and validate the model parameters,which then are used to assess geotechnical issues related with installing a new high capacity longwall mine at the mine site.A variety of parameters,for example,chock convergences,caveability of overlying sandstones,abutment and vertical stresses have been estimated.

关键词：岩土工程问题缩尺模型工程评估数值分析选择工具长壁开采连续介质力学数值方法

Effect of strata properties and panel widths on chock performance

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第S1期3卷 407-414页

作者： manoj khanal Deepak Adhikary Rao Balusu Earth Science and Resource Engineering Commonwealth Scientific and Industrial Research Organization (CSIRO) ClaytonVIC 3169Australia Queensland Center for Advanced Technology Commonwealth Scientific and Industrial Research Organization(CSIRO)Pullenvale QLD 4069Australia

The selection of optimum chock (support) capacity is very crucial for a successful longwall mining. The selection of chock capacity depends on the site-specific geotechnical parameters, constraints and longwall panel geometry, which are generally not known in detail in priority. Hence, based on the field and laboratory data, various possible combinations should be analyzed to cater for the unforeseeable mining conditions. This paper discusses the use of numerical model for selecting an appropriate chock capacity based on the site-specific geological and geotechnical information and longwall panel geometry. The fracture mechanisms of immediate and main roofs are also discussed for various panel widths and support capacities. For the models considered, the chock convergence is predicted to increase by about 33% due to the increase in face width from 100 to 260 m. Similarly, the massive roof strata are found to yield higher chock convergence compared to bedded strata.

关键词： chock capacity longwall simulation underground mining