Fracturing, caving propagation and influence of mining on groundwater above longwall panels–a review of predictive models

Published on Jan 1, 2020in International journal of mining science and technology4.084
· DOI :10.1016/J.IJMST.2019.12.001
Bruce Hebblewhite20
Estimated H-index: 20
(UNSW: University of New South Wales)
Sources
Abstract
Abstract Historically there have been a number of different hypotheses and empirical models developed in an attempt to describe the nature of fracturing above longwall panels in underground coal mining. The motivation for such models varies, ranging from understanding the impact of mining on surface subsidence, to back-analysis of caving behaviour in the immediate roof behind the longwall face. One of the most critical motivating factors that is taking on increased importance in many coalfields, is the need for better understanding, and hence prediction of the impact of mining on overlying strata, particularly strata units acting as aquifers for different groundwater horizons. This paper reviews some of the major prediction models in the context of observed behaviour of strata displacement and fracturing above longwall panels in the southern coalfields of New South Wales, south of Sydney. The paper discusses the parameter often referred to as “height of fracturing” in terms of the critical parameters that influence it, and the relevance and appropriateness of this terminology in the context of overlying sub-surface subsidence and groundwater impact. The paper proposes an alternative terminology for this parameter that better reflects what it is and how it is used. The paper also addresses the potential role of major bedding shear planes mobilised by mining and their potential influence on overlying subsidence and groundwater interference.
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References3
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#1Paul Tammetta (Coffey International)H-Index: 2
The height of complete groundwater drainage above subsided longwall panels (referred to as H) at underground mines is determined using a data base of hydraulic head measurements made with multiple devices down the depth profile at each of a number of sites worldwide. H is shown to be relatively independent of most parameters except the geometry of the mined void and the overburden thickness. An empirical equation linking H to these parameters is developed using hydraulic head data, and confirmed...
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#1Javad Ashjari (UT: University of Tehran)H-Index: 3
An aquifer test is used mostly to determine the storage coefficient and transmissivity. Although residual drawdown data are widely used in estimating the transmissivity of aquifers, the estimation of storage coefficients with recovery data is controversial. Some researchers have proposed methods to estimate storage coefficients with recovery data by assuming equality of storage coefficients for the recovery and pumping periods (S = S′). The aim of this study is to determine storage coefficients ...
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#2Vice PresidentH-Index: 1
Over the past 25 years, the present author has written with several co-authors a series of papers beginning with the landmark paper in the 1 st International Conference on Ground Control in Mining in 1981, in turn, based upon U. S. Bureau of Mines (USBM) funded contract research managed by the author with a final report issued in 1979, all concerning this paper’s title subject, Effect of FullExtraction Underground Mining on Ground and Surface Waters. Initially the work was a summary of British, ...
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#1Xin Wang (CUMT: China University of Mining and Technology)H-Index: 3
#2Zhimin Xu (CUMT: China University of Mining and Technology)H-Index: 3
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Abstract null null As a new technical means that can detect abnormal signs of water inrush in advance and give an early warning, the automatic monitoring and early warning of water inrush in mines has been widely valued in recent years. Due to the many factors affecting water inrush and the complicated water inrush mechanism, many factors close to water inrush may have precursory abnormal changes. At present, the existing monitoring and early warning system mainly uses a few monitoring indicator...
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#1Wojciech WitkowskiH-Index: 15
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Last. Ryszard HejmanowskiH-Index: 8
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Horizontal strains related to mining-induced subsidence may endanger infrastructure and surface users’ safety. While directional horizontal strains should be well determined, appropriate solutions for a complete assessment of the terrain surface deformation field are still required. As a result, the presented study examined a new method for calculating horizontal strain tensor based on the decomposition of satellite radar interferometry (InSAR) observations into vertical and azimuth look directi...
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#2Hai Pu (CUMT: China University of Mining and Technology)H-Index: 16
#7Ziheng Sha (CUMT: China University of Mining and Technology)H-Index: 2
Abstract null null Bulking characteristics of gangue are of great significance for the stability of goafs in mining overburden in the caving zones. In this paper, a particle discrete element method with clusters to represent gangue was adopted to explore the bulking coefficient time effect of the broken rock in the caving zone under three-dimensional triaxial compression condition. The phenomena of stress corrosion, deformation, and failure of rock blocks were simulated in the numerical model. M...
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#1Feng CuiH-Index: 3
#2Chong JiaH-Index: 2
Last. Shuai DongH-Index: 1
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The western region of China is rich in mineral resources. The vigorous development of mineral resources has exacerbated the environmental and safety problems in the region. One of the important links to solve this problem is to control the development laws and distribution characteristics of the overburdened cracks in the mining of this area. In this paper, the Xiashijie coal mine 3-2 coal seam and 4-2 coal seam are examples of repeated mining, and are examined as the background, through theoret...
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#1Jinjin Tian (SDUST: Shandong University of Science and Technology)H-Index: 1
#2Dongjing Xu (SDUST: Shandong University of Science and Technology)H-Index: 3
Last. Tianhao Liu (SDUST: Shandong University of Science and Technology)H-Index: 1
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Abstract The distribution characteristics and evolution law of rock mass fissures induced by mining are a key scientific issue in the study of deep rock mechanics. In this study, a series of uniaxial compression experiments was conducted on rock-like specimens containing double V-shaped prefabricated fissures at dip angles of α = β = 45°, α = 45°
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The environmental impact assessment of underground mining usually includes the direct effects of exploitation. These are damage to rock mass and land subsidence. Continuous dewatering of the aquifer system is, however, necessary to carry out underground mining operations. Consequently, the drainage of the aquifer system is observed at a regional scale. The spatial extent of the phenomenon is typically much wider than the direct impact of the exploitation. The research presented was, therefore, a...
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