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Title: Permeability variations within mining-induced fractured rock mass and its influence on groundwater inrush

Journal Article · · Environmental Earth Sciences
 [1];  [2];  [3];  [4]
  1. China Univ. of Mining and Technology, Xuzhou (China); North China Univ. of Water Resources and Electric Power, Zhengzhou (China); Univ. of the Pacific, Stockton, CA (United States)
  2. China Univ. of Mining and Technology, Xuzhou (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of the Pacific, Stockton, CA (United States)
+ Show Author Affiliations

This paper is concerned with the evaluation of permeability of fractured rock mass due to the cover stress re-establishment, which is a major factor in controlling water and gas flow rate induced by mining operations in fractured rock. The case study considered in this paper is based on the results of observations of groundwater inrush and a decrease in water inflow from the fractured roof strata due to mining advancing in the Taiping Coalmine, Shandong Province, China. A conceptual model of an effective porous media was used to assess the permeability distribution in the fractured zone induced by coal mining. The cover stress re-establishment in gob fractured rock mass was evaluated using an empirical formula based on the surface subsidence. A simplified conceptual model of the fractured zone was used to evaluate the deformation of fractured zone along with the evaluation of changes in the rock permeability above the gob due to the cover stress re-establishment. These data were then used to calculate the water inflow rate into the panel. Predicted water inflow rates have been found to be in good agreement with those from monitoring data. This study improved the understanding of the mechanisms of the post-mining cover stress re-establishment on permeability change of the overburden fracture rock strata. These results can then be applied for numerical simulations of the process of overburden failure and consequent groundwater inrush due to coal mining.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1581115
Journal Information:
Environmental Earth Sciences, Vol. 75, Issue 4; ISSN 1866-6280
Publisher:
Springer-VerlagCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (7)

Study of a roof water inrush prediction model in shallow seam mining based on an analytic hierarchy process using a grey relational analysis method journal April 2018
On prevention and mechanism of bed separation water inrush for thick coal seams: a case study in China journal November 2018
Simulation analysis of water resource damage feature and development degree of mining-induced fracture at ecologically fragile mining area journal January 2019
Shear-induced Permeability Evolution of Sandstone Fractures journal December 2018
Strata Movement and Fracture Propagation Characteristics due to Sequential Extraction of Multiseam Longwall Panels journal December 2018
The Assessment and Evolution of Water-Conducting Rules under the Influence of Mining-Induced Stress journal September 2018
Study on the Permeability of Weakly Cemented Sandstones journal January 2019

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Related Subjects

54 ENVIRONMENTAL SCIENCES
Underground coal mining
Gob
Bulking factor
Permeability of fractured rock mass
Cover stress re-establishment
Groundwater inrush rate