Influence of mining induced subsidence on groundwater resources

Derek Elsworth, Jishan Liu

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

An approach is developed to quantify the impact of longwall mining on the potential disruption of groundwater resources. The underlying premise of the method is to assume that the primary mechanism causing dewatering is the development of new fractures or the dilation of existing fractures, as a result of mining induced displacements. From this assumption it is possible to evaluate the potential influence on groundwater resources by; (1) evaluating the anticipated distribution of strain that will accompany mining advance; (2) from this strain distribution, quantify the magnitude and spatial distribution of modified permeabilities; and (3) use this modified hydraulic conductivity field to define changes in the hydrologic budget, thereby defining the potential for, and extent of, any dewatering. Numerical simulation, using the finite element method, is used to both determine the mining induced distribution in strain and to complete hydrologic budget calculations with the revised conductivity field. This approach is applied to mining geometries representative of the eastern United States to define the anticipated sensitivity of these systems to changes in overburden thickness and topography. Results indicate that observed trends in dewatering behaviour may be explained on the basis of zones of contiguous extensile strain, induced within the overburden as a result of mining.

Original languageEnglish (US)
JournalIAHS-AISH Publication
Issue number234
StatePublished - Dec 1 1995

Fingerprint

groundwater resource
subsidence
dewatering
overburden
longwall mining
dilation
finite element method
hydraulic conductivity
conductivity
topography
permeability
spatial distribution
geometry
simulation
distribution
budget

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Water Science and Technology

Cite this

@article{d17f97b7a1e1475fb6eb454ec105c903,
title = "Influence of mining induced subsidence on groundwater resources",
abstract = "An approach is developed to quantify the impact of longwall mining on the potential disruption of groundwater resources. The underlying premise of the method is to assume that the primary mechanism causing dewatering is the development of new fractures or the dilation of existing fractures, as a result of mining induced displacements. From this assumption it is possible to evaluate the potential influence on groundwater resources by; (1) evaluating the anticipated distribution of strain that will accompany mining advance; (2) from this strain distribution, quantify the magnitude and spatial distribution of modified permeabilities; and (3) use this modified hydraulic conductivity field to define changes in the hydrologic budget, thereby defining the potential for, and extent of, any dewatering. Numerical simulation, using the finite element method, is used to both determine the mining induced distribution in strain and to complete hydrologic budget calculations with the revised conductivity field. This approach is applied to mining geometries representative of the eastern United States to define the anticipated sensitivity of these systems to changes in overburden thickness and topography. Results indicate that observed trends in dewatering behaviour may be explained on the basis of zones of contiguous extensile strain, induced within the overburden as a result of mining.",
author = "Derek Elsworth and Jishan Liu",
year = "1995",
month = "12",
day = "1",
language = "English (US)",
journal = "IAHS-AISH Publication",
issn = "0144-7815",
number = "234",

}

Influence of mining induced subsidence on groundwater resources. / Elsworth, Derek; Liu, Jishan.

In: IAHS-AISH Publication, No. 234, 01.12.1995.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Influence of mining induced subsidence on groundwater resources

AU - Elsworth, Derek

AU - Liu, Jishan

PY - 1995/12/1

Y1 - 1995/12/1

N2 - An approach is developed to quantify the impact of longwall mining on the potential disruption of groundwater resources. The underlying premise of the method is to assume that the primary mechanism causing dewatering is the development of new fractures or the dilation of existing fractures, as a result of mining induced displacements. From this assumption it is possible to evaluate the potential influence on groundwater resources by; (1) evaluating the anticipated distribution of strain that will accompany mining advance; (2) from this strain distribution, quantify the magnitude and spatial distribution of modified permeabilities; and (3) use this modified hydraulic conductivity field to define changes in the hydrologic budget, thereby defining the potential for, and extent of, any dewatering. Numerical simulation, using the finite element method, is used to both determine the mining induced distribution in strain and to complete hydrologic budget calculations with the revised conductivity field. This approach is applied to mining geometries representative of the eastern United States to define the anticipated sensitivity of these systems to changes in overburden thickness and topography. Results indicate that observed trends in dewatering behaviour may be explained on the basis of zones of contiguous extensile strain, induced within the overburden as a result of mining.

AB - An approach is developed to quantify the impact of longwall mining on the potential disruption of groundwater resources. The underlying premise of the method is to assume that the primary mechanism causing dewatering is the development of new fractures or the dilation of existing fractures, as a result of mining induced displacements. From this assumption it is possible to evaluate the potential influence on groundwater resources by; (1) evaluating the anticipated distribution of strain that will accompany mining advance; (2) from this strain distribution, quantify the magnitude and spatial distribution of modified permeabilities; and (3) use this modified hydraulic conductivity field to define changes in the hydrologic budget, thereby defining the potential for, and extent of, any dewatering. Numerical simulation, using the finite element method, is used to both determine the mining induced distribution in strain and to complete hydrologic budget calculations with the revised conductivity field. This approach is applied to mining geometries representative of the eastern United States to define the anticipated sensitivity of these systems to changes in overburden thickness and topography. Results indicate that observed trends in dewatering behaviour may be explained on the basis of zones of contiguous extensile strain, induced within the overburden as a result of mining.

UR - http://www.scopus.com/inward/record.url?scp=0029539748&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029539748&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0029539748

JO - IAHS-AISH Publication

JF - IAHS-AISH Publication

SN - 0144-7815

IS - 234

ER -