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SAFETY ASSESSMENT FOR THE LAND SURFACE IN THE VICINITY OF THE POTASH SHAFT NEUSTAßFURT VI

In the 70's the former potash mine Neustasfurt VI/VII located in the northeast flank of the Stasfurt Salt Anticline was flooded initiating sinkholes around the shaft Neustasfurt VI until today. At the end of the 90's a safety assessment was desired to estimate the risk for the land surface. Underground exploration found a leaching cavern in the vicinity of the shaft. To assess the stability of this cavern and of the shaft itself a comprehensive rock mechanical study based on laboratory tests and numerical investigations with 3DEC was performed. The calculations show that the overburden of the leaching cavern remains stable but the shaft stability and its surrounding is threatened when the shaft lining will be destroyed.