Integrated Monitoring and Modelling of Ground Subsidence in Potash Mines

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• 作者：Chrzanowski ; A. ; Monahan ; C. ; Roulston ; B. ; Szostak-Chrzanowski ; A.
• 关键词：subsidence ; deformation ; monitoring ; numerical modelling ; case history ; time dependency ; salt rocks
• 刊名：International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
• 出版年：1997
• 出版时间：April 6, 1997
• 年：1997
• 卷：34
• 期：3-4
• 页码：621
• 全文大小：94.0 K

文摘

The New Brunswick Division of the Potash Corporation of Saskatchewan (PCS) and the Potacan Mining Company mine two potash deposits in southern New Brunswick. Although the two mines are located only 30 km apart, their geological and mining conditions are quite different. From the very begining of their operation (the mid 1980s), both mines have put considerable effort into studying the mechanism of the rock's response to the mining operation including the time dependent response of the ground's surface. Systematic monitoring of ground subsidence was initiated by Potacan and PCS mines in cooperation with a research team from the University of New Brunswick (UNB) in 1986 and 1989, respectively. The newest geodetic techniques such as digital levels, electronic distance and angle measurements, and the satellite Global Positioning System (GPS), as well as the most recent statistical methods of deformation analysis are employed in the study. So far, the most interesting and rather unexpected findings of the 8-10 yr subsidence monitoring are: (1) almost linear in time response of the surface to underground mining (in both mines), (2) faster than expected response (acceleration of subsidence) of the surface to expanded mining at Potacan, and (3) larger than expected horizontal displacements which reach the same values as vertical displacements.