The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Laura Cornish - One of the best experts on this subject based on the ideXlab platform.
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A Canadian upgrade - revolutionising Shaft Sinking in South Africa : underground development
Inside Mining, 2012Co-Authors: Laura CornishAbstract:South Africa may have the world's respect for its deep level Shaft Sinking project expertise, but the same cannot be said for its safety statistics. "Our local Shaft Sinking model needs to be modernised," TWP Mining general manager, Murray Macnab, tells Laura Cornish.
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Sasol Mining's flagship replacement project : prestigious projects of 2011 / 2012
Inside Mining, 2012Co-Authors: Laura CornishAbstract:The Shaft Sinking contract and decline development contract were awarded in May 2011 to Murray & Roberts Cementation, a division of major engineering firm, Murray & Roberts Group.
Robert Duda - One of the best experts on this subject based on the ideXlab platform.
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methods of determining rock mass freezing depth for Shaft Sinking in difficult hydrogeological and geotechnical conditions określenie glebokości zamrazania gorotworu dla potrzeb glebienia szybow w trudnych warunkach hydrogeologicznych i geotechniczny
Archives of Mining Sciences, 2014Co-Authors: Robert DudaAbstract:Methods of determining the depth of rock mass freezing for the purpose of Shaft Sinking in solid rocks in difficult hydrogeological and geomechanical conditions are analyzed in this paper. There are presented factors on the basis of which the freezing depth can be determined in heterogeneous rocks media. The author focuses on the source of problems with establishing parameters used for defining the freezing depth. A method of interpreting hydrogeological and geomechanical source data is presented on two examples of weak and medium compact sandstones freezing for the purpose of Shaft Sinking in the Legnica-Glogow Copper Mining District, south-western Poland. Moreover, a general algorithm for determining the rock mass freezing depth is given. The following main criteria of freezing depth evaluation have been assumed: hydraulic conductivity values, porosity, rock quality designation index (RQD) and Protodiakonow’s rock compaction index. The outflow of drilling fluid in the exploration borehole was taken into account as a complementary criterion. The practical use of the algorithm was exemplified by a geological profile.
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Methods of Determining Rock Mass Freezing Depth for Shaft Sinking in Difficult Hydrogeological and Geotechnical Conditions/Określenie Głębokości Zamrażania Górotworu Dla Potrzeb Głębienia Szybów W Trudnych Warunkach Hydrogeologicznych I Geotechniczny
Archives of Mining Sciences, 2014Co-Authors: Robert DudaAbstract:Methods of determining the depth of rock mass freezing for the purpose of Shaft Sinking in solid rocks in difficult hydrogeological and geomechanical conditions are analyzed in this paper. There are presented factors on the basis of which the freezing depth can be determined in heterogeneous rocks media. The author focuses on the source of problems with establishing parameters used for defining the freezing depth. A method of interpreting hydrogeological and geomechanical source data is presented on two examples of weak and medium compact sandstones freezing for the purpose of Shaft Sinking in the Legnica-Glogow Copper Mining District, south-western Poland. Moreover, a general algorithm for determining the rock mass freezing depth is given. The following main criteria of freezing depth evaluation have been assumed: hydraulic conductivity values, porosity, rock quality designation index (RQD) and Protodiakonow’s rock compaction index. The outflow of drilling fluid in the exploration borehole was taken into account as a complementary criterion. The practical use of the algorithm was exemplified by a geological profile.
Ding Yong - One of the best experts on this subject based on the ideXlab platform.
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Technology for Sinking of 221.86 m-deep Ventilation Shaft of Underground Powerhouse
Tunnel Construction, 2010Co-Authors: Ding YongAbstract:In Xiluodu Hydropower Project,a ventilation Shaft with more than 200 m depth has been designed for the main transformer chamber of the underground powerhouse.Many unexpected problems,which have never been encountered in previous similar projects,have occurred during Shaft Sinking due to the high technological requirements,great construction difficulties,poor operating conditions and extreme safety risks.Shaft Sinking sequences,Shaft Sinking methods,blasting parameters and survey points/lines have been determined on basis of the site resources and the geological conditions.The countermeasures for the geologic risks at the bottom opening of the Shaft have also been fully considered.Thus,the Sinking of the 221.86m-deep vertical Shaft has been completed with high quality.The Sinking of the ventilation Shaft in Xiluodu Project is universe in hydropower fields,therefore the experience may serve as reference for the Sinking of other Shafts of future hydropower projects.
Zongjin Wang - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation and measurement analysis of the temperature field of artificial freezing Shaft Sinking in cretaceous strata
AIP Advances, 2019Co-Authors: Xiaojian Wang, Zongjin WangAbstract:Targeting the challenging analysis of the temperature field of the artificial freezing Shaft Sinking projects in Cretaceous strata, this study used the Hongqinghe air Shaft freezing project as an example to perform a numerical simulation and measurement analysis of the temperature field of Shaft Sinking via the artificial freezing method in Cretaceous strata. First, the thermal physical parameters and mechanical properties of frozen Cretaceous rock were measured in the lab. Based on the engineering geological conditions and test parameters, the Hongqinghe air Shaft freezing parameters were designed, and the preliminary scheme of the freezing project was obtained, in which a single ring of freezing holes was arranged in Cretaceous strata, the freezing wall had a design thickness of 3.7 m, and the average temperature was -12°C. Next, a numerical model for the temperature field of the freezing project was established to predict and analyze the effective thickness, average temperature, and Shaft wall temperature of the frozen wall at different depths of Shaft excavation. Finally, a comparison and analysis of field temperatures measured at the inspection holes and Shaft walls showed that the numerical simulation results generally agreed with the field measurements. The field measurements showed that at the initial stage of freezing, the cooling rates of fine-, medium- and coarse-grained sandstones were 0.364 °C/d, 0.397 °C/d and 0.440 °C/d, respectively. Informatized construction enabled the air Shaft freezing project in the Hongqinghe coal mine to be completed successfully.
Zhang Guo-yong - One of the best experts on this subject based on the ideXlab platform.
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Research on site measurement of outer Shaft wall stressing in freezing Sinking Shaft in special thick alluvium
Coal science and technology, 2004Co-Authors: Zhang Guo-yongAbstract:In order to solve the technical problems of freezing Shaft Sinking in special thick alluvium in Main and Auxiliary Mine Shafts, site measurements of inner and outer stresses of the outer Shaft wall were conducted during the Shaft Sinking. The site measured data of freezing clay pressure below 400 m were obtained. After the information feedback, a dynamic design and informational construction was made for the two mine Shaft construction.