Investigations into Mining-Induced Stress–Fracture–Seepage Field Coupling in a Complex Hydrogeology Environment

A Case Study in the Bulianta Colliery

Tong Zhang* (Corresponding Author), Yixin Zhao, Quan Gan, Xiaodong Nie, Guangpei Zhu, Yong Hu

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The effect of mining-induced multi-physics coupling, characterized by stress–fracture–seepage field coupling (SFCC), is critical to safe mining and environmental protection. We investigated the spatiotemporal characteristics of the SFCC at the #31401 panel of the Bulianta Colliery. Changes in overburden movement, groundwater level, and groundwater inrush were monitored by means of borehole and working face observations, water leakage, and real-time video imaging. The results indicate that the distribution of mining-induced fractures was dominated by the key stratum, distributed as a “ladder shape” 30–75 m above the coal seam. The fracture penetrated into the lower key stratum and developed into the confined aquifer with a height of 140.5–154.0 m, while being truncated by the higher key stratum. Horizontal and vertical fractures developed sequentially in the confined aquifer-disturbed zone. Initiation, propagation, and interconnection of the seepage channel occurred in the fracture field, mediated by the redistributed stress. An abnormal discharge of 120–300 m3/h along the direction of mining commenced at the transition of the lower key stratum to the higher key stratum, and concentrated below the Bulian Gully. A fracture height model was developed based on the vertical fracture propagation, and mining parameters were modified, including reducing the mining height and increasing the advance rate and support resistance of the longwall mining face to effectively reduce the SFCC effect.

Original languageEnglish
Pages (from-to)632-642
Number of pages11
JournalMine Water and the Environment
Volume38
Issue number3
Early online date30 May 2019
DOIs
Publication statusPublished - Sep 2019

Fingerprint

Hydrogeology
hydrogeology
confined aquifer
Aquifers
Groundwater
Longwall mining
advance rate
longwall mining
fracture propagation
groundwater
Ladders
Seepage
gully
Environmental protection
Boreholes
overburden
coal seam
leakage
seepage
environmental protection

Keywords

  • China
  • Confined aquifer
  • Fracture height model
  • Key stratum
  • Seepage channel
  • SFCC

ASJC Scopus subject areas

  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Investigations into Mining-Induced Stress–Fracture–Seepage Field Coupling in a Complex Hydrogeology Environment : A Case Study in the Bulianta Colliery. / Zhang, Tong (Corresponding Author); Zhao, Yixin; Gan, Quan; Nie, Xiaodong; Zhu, Guangpei; Hu, Yong.

In: Mine Water and the Environment, Vol. 38, No. 3, 09.2019, p. 632-642.

Research output: Contribution to journalArticle

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title = "Investigations into Mining-Induced Stress–Fracture–Seepage Field Coupling in a Complex Hydrogeology Environment: A Case Study in the Bulianta Colliery",
abstract = "The effect of mining-induced multi-physics coupling, characterized by stress–fracture–seepage field coupling (SFCC), is critical to safe mining and environmental protection. We investigated the spatiotemporal characteristics of the SFCC at the #31401 panel of the Bulianta Colliery. Changes in overburden movement, groundwater level, and groundwater inrush were monitored by means of borehole and working face observations, water leakage, and real-time video imaging. The results indicate that the distribution of mining-induced fractures was dominated by the key stratum, distributed as a “ladder shape” 30–75 m above the coal seam. The fracture penetrated into the lower key stratum and developed into the confined aquifer with a height of 140.5–154.0 m, while being truncated by the higher key stratum. Horizontal and vertical fractures developed sequentially in the confined aquifer-disturbed zone. Initiation, propagation, and interconnection of the seepage channel occurred in the fracture field, mediated by the redistributed stress. An abnormal discharge of 120–300 m3/h along the direction of mining commenced at the transition of the lower key stratum to the higher key stratum, and concentrated below the Bulian Gully. A fracture height model was developed based on the vertical fracture propagation, and mining parameters were modified, including reducing the mining height and increasing the advance rate and support resistance of the longwall mining face to effectively reduce the SFCC effect.",
keywords = "China, Confined aquifer, Fracture height model, Key stratum, Seepage channel, SFCC",
author = "Tong Zhang and Yixin Zhao and Quan Gan and Xiaodong Nie and Guangpei Zhu and Yong Hu",
note = "This paper was supported by the Anhui Provincial Natural Science Foundation (nos. 1908085QE183 and 1808085QE177), Anhui University Scientifc Research Foundation (no. QN2018108), Anhui Province Science and Technology Plan Foundation (nos. 1704a0802129), and the National Key Research and Development Program of China (nos. 2016YFC0801401 and 2016YFC0600708).",
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AB - The effect of mining-induced multi-physics coupling, characterized by stress–fracture–seepage field coupling (SFCC), is critical to safe mining and environmental protection. We investigated the spatiotemporal characteristics of the SFCC at the #31401 panel of the Bulianta Colliery. Changes in overburden movement, groundwater level, and groundwater inrush were monitored by means of borehole and working face observations, water leakage, and real-time video imaging. The results indicate that the distribution of mining-induced fractures was dominated by the key stratum, distributed as a “ladder shape” 30–75 m above the coal seam. The fracture penetrated into the lower key stratum and developed into the confined aquifer with a height of 140.5–154.0 m, while being truncated by the higher key stratum. Horizontal and vertical fractures developed sequentially in the confined aquifer-disturbed zone. Initiation, propagation, and interconnection of the seepage channel occurred in the fracture field, mediated by the redistributed stress. An abnormal discharge of 120–300 m3/h along the direction of mining commenced at the transition of the lower key stratum to the higher key stratum, and concentrated below the Bulian Gully. A fracture height model was developed based on the vertical fracture propagation, and mining parameters were modified, including reducing the mining height and increasing the advance rate and support resistance of the longwall mining face to effectively reduce the SFCC effect.

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