A Study of Water-Inrush Mechanisms Based on Geo-Mechanical Analysis and an In-situ Groundwater Investigation in the Zhongguan Iron Mine, China

A Study of Water-Inrush Mechanisms Based on Geo-Mechanical Analysis and an In-situ Groundwater... The Zhongguan iron mine is strongly threatened by water inrushes because of the thick Ordovician limestone aquifer and a variety of concealed faults. An inrush event occurred at −260 m below sea level (bsl), inundating the mine during the mineral deposit developing stage. It was very important to understand why and how this occurred to prevent its recurrence. A numerical simulation of a process-based model of the excavation, together with an in-situ groundwater investigation, showed that the event was related to the normally impermeable X1 fault, which was gradually activated from the bottom of the aquifer to the mine roof as excavation developed. The activated fault transformed into an inrush channel, hydraulically connecting the aquifer and the roadway. Thus, faults and other geological structures have to be mapped before mining. Moreover, sealing possible water channels before excavation in potential inrush areas is much better than advance dewatering because of the aquifer’s transmissivity and the limited effectiveness of grout curtains. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mine Water and the Environment Springer Journals

A Study of Water-Inrush Mechanisms Based on Geo-Mechanical Analysis and an In-situ Groundwater Investigation in the Zhongguan Iron Mine, China

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Earth Sciences; Geology; Water Quality/Water Pollution; Hydrogeology; Mineral Resources; Ecotoxicology; Industrial Pollution Prevention
ISSN
1025-9112
eISSN
1616-1068
D.O.I.
10.1007/s10230-017-0429-5
Publisher site
See Article on Publisher Site

Abstract

The Zhongguan iron mine is strongly threatened by water inrushes because of the thick Ordovician limestone aquifer and a variety of concealed faults. An inrush event occurred at −260 m below sea level (bsl), inundating the mine during the mineral deposit developing stage. It was very important to understand why and how this occurred to prevent its recurrence. A numerical simulation of a process-based model of the excavation, together with an in-situ groundwater investigation, showed that the event was related to the normally impermeable X1 fault, which was gradually activated from the bottom of the aquifer to the mine roof as excavation developed. The activated fault transformed into an inrush channel, hydraulically connecting the aquifer and the roadway. Thus, faults and other geological structures have to be mapped before mining. Moreover, sealing possible water channels before excavation in potential inrush areas is much better than advance dewatering because of the aquifer’s transmissivity and the limited effectiveness of grout curtains.

Journal

Mine Water and the EnvironmentSpringer Journals

Published: Feb 17, 2017

References

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