2/19/2024 0 Comments Process Monitor 3.95 free instals![]() ![]() It is a first such case in Polish coal mining. One of the biggest innovations is application of the same head frame for both processes of sinking and regular operation of Grzegorz shaft. However, Grzegorz shaft sinking is characterized by high level of innovativeness. Shaft sinking is a huge and complicated venture, especially in terms of difficult geological conditions. Ordinate of surface level is +258,0 m and its depth is 870,0 m. Its inner cross-section is circle with a diameter of 7,5 m. Grzegorz shaft was designed as a downcast, man and material shaft. Principles of ground freezing method and solution used for Grzegorz shaft sinking was described in details in following sections. It can also play a role of sidewall’s support, as frozen rocks and soils are characterized by higher strength than those in natural state. Column of frozen soils and rocks prevents shaft heading from flooding. Mine shaft is sunk in such prepared rock mass using traditional methods, such as drill sand blasts. Its essence is creating a column of frozen ground and it is realized by pumping freezing medium to boreholes. As the most effective, safe and reliable, ground freezing method was chosen for purpose of Grzegorz shaft sinking. Utilization of different methods, such as rock mass drainage and grouting, were analyzed, but expected low effectiveness effected in their abandonment. Īpplication of typical shaft sinking method in case of Grzegorz shaft is impossible because of high rock mass’ water accumulation and rock’s low soaking resilience. Company has got 75 years of experience in shaft sinking, including projects in extremely hard conditions, as well as in use of ground freezing method. This venture was entrusted to Shaft Sinking Company (PBSz S.A.), part of the JSW Group and a leader of highly specialized mining services market in Poland. This method was in common use in Silesian Coal Basin back in the days, but nowadays it is rarely used, mostly because of a small number of new shafts sunk. ![]() Difficult conditions in its geological cross-section forced application of special shaft sinking method, which is ground freezing. Grzegorz shaft is one of the biggest today’s projects in Polish mining industry. ![]() Grzegorz shaft: The first shaft in Silesian Coal Basin sunk using ground freezing method in 21st century ![]()
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