Prediction analysis model for groundwater potential based on set pair analysis of a confined aquifer overlying a mining area

Shi, Shouqiao; Wei, Jiuchuan; Xie, Daolei; Yin, Huiyong; Li, Liyao

doi:10.1007/s12517-019-4267-6

Cited by 17 publications

(6 citation statements)

References 51 publications

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“…The key to introduce the set pair analysis theory [34] into the risk assessment of water inrush from coal seam roof is by forming a set pair of risk influencing factors and evaluation criteria, and the relationship between them can be divided into two types: Certainty expressed by the same degree and opposition degree and uncertainty expressed by difference degree. Through the quantitative analysis of the similarities, opposites, and differences between them, the quantitative indexes of risk assessment are obtained, and the membership function of the connection degree of each evaluation index and its corresponding grading evaluation standard is constructed [35,36].…”

Section: Establishment Of the Combination Weighting-set Pair Analysis...mentioning

confidence: 99%

Risk Assessment of Water Inrush from Coal Seam Roof Based on Combination Weighting-Set Pair Analysis

Xie

Han

Zhang³

et al. 2022

Sustainability

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When exploiting Jurassic-era coal resources in Northwest China, there are risks of water inrush and sand burst disasters from coal seam roofs. To improve the safety of coal mining, it is imperative to accurately and objectively evaluate the water inrush risk of sandstone aquifers from coal seam roofs and to reasonably and effectively prevent and control water disasters. In this paper, the 221 mining area of the Shilawusu Coal Mine was considered. By combining the basic geological condition data, hydrogeological condition data, and drilling data in the area studied, four main control factors, including the equivalent thickness of sandstone, the lithology coefficient of sandstone, the interbedded coefficient of sand and mud, and the core recovery rate, were selected as evaluation indexes for predicting the water inrush risk from the coal seam roof. A hierarchical prediction and discrimination model of water inrush risk based on combination weighting-set pair analysis was established. The combination weighting method, which is based on the sum of squared deviations, was used to optimize the subjective and objective weight values obtained by the improved analytic hierarchy process and entropy weight methods. By applying set pair analysis theory, the comprehensive connection degree was determined using the set pair connection degree function that was constructed with 31 instances of drilling data in the study area. Then, the risk grade of each drilling data instance was evaluated by the confidence criterion of set pair analysis to calculate the water inrush risk evaluation index. Finally, the obtained index was combined with the borehole pumping test data and the discharging test data to partition the water inrush risk from the coal seam roof. The results indicated that most of the 221 mining area is safe, and the small transitional and dangerous areas are only in the central and northern regions. Based on the combination weighting-set pair analysis method, the water inrush risk from the coal seam roofs in the study area was accurately and objectively classified by a discrimination model.

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Section: Establishment Of the Combination Weighting-set Pair Analysis...mentioning

confidence: 99%

Risk Assessment of Water Inrush from Coal Seam Roof Based on Combination Weighting-Set Pair Analysis

Xie

Han

Zhang³

et al. 2022

Sustainability

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“…Coal is the leading energy source in China and an important industrial raw material. , Many coal mines in China have complex geological conditions; the depth of mining has been increasing in recent years, and mine water disaster seriously restricts the safe and efficient production of coal mines, − among which fault water disaster occurs in high frequencies, is highly invisible, and causes particularly severe harm. − According to statistics, more than 80% of coal floor water inrush is caused by fracture structures such as faults. − As a typical geological structure during mine production, the fault, with crack development in the coal and rock near them and damage to the native rock structure and its integrity, is very likely to become water channels between the aquifer and the coal seam under mining disturbance conditions, posing the threat of water disaster to mine production and even causing water inrush accidents, leading to economic losses and casualties . It can be seen that the fault water disaster is a severe threat to the safety of coal mine production, and it is necessary to conduct a series of studies on the fault permeability evolution and the retention of fault waterproof coal (rock) pillars.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution of Fault Permeability and the Retention of Coal (Rock) Pillar under the Mining Conditions of Thick Coal Seam in the Footwall of Large Normal Fault

et al. 2023

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As a typical geological structure, the fault often threatens the safe mining of coal mines. In order to investigate the permeability evolution of the significant normal fault under the mining disturbance of the thick coal seam of the fault footwall and to propose a scientific and reasonable coal (rock) pillar retention plan, this paper took the YinJiaWa Fault (YJW Fa), a large normal fault, in Fucun Coal Mine, Shandong Province, China, as a research object, conducted a coupled fluid and solid simulation study on permeability evolution of the fault using COMSOL Multiphysics, based on the revealed geological data and rock mechanical parameters, and combined the theoretical calculation results to determine the width of the waterproof coal (rock) pillar. The results show that the width of the waterproof coal (rock) pillar of YJW Fa is negatively correlated with the porosity, permeability, and flow velocity of each monitoring point. With the width of 60 m as the dividing point, as the width left less than 60 m and gradually reduced to 30 m, its water-blocking capacity is destroyed, increasing the seepage velocity in the water-flowing fractured zone, forming a water channel, causing water inrush accidents. The formula and numerical simulation results are used to determine the width of the waterproof coal (rock) pillar of the YJW Fa to be 74.44−84.08 m, to ensure the safe mining of the fault footwall. This paper provides a theoretical basis for further understanding of the fault permeability development rules and safety guidance for coal seam mining of the fault footwall.

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“…The distribution of sand bodies was complex, the sand bodies were spatially superimposed on each other, and the sedimentary facies transition was rapid. With the large-scale mining of coal, water inrush accidents in coal mines frequently occur . The fundamental reason for these accidents is poor understanding of the reserved capacity and distributed rule of aquifers. , In addition, the mineralization of sandstone-type uranium deposits is also controlled by the distribution of aquifers., The perspective of sedimentary genesis can well predict the spatial distribution of aquifers and explain the hydrodynamic properties of aquifers; thus, sedimentology studies can provide geological guarantees for the safe production of coal mine and the in situ leaching of sandstone-type uranium…”

Section: Introductionmentioning

confidence: 99%

3D Quantitative Prediction of the Groundwater Potential Area─A Case Study of a Simple Geological Structure Aquifer

Xia

Liu

et al. 2022

ACS Omega

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The Ordos Basin is a sedimentary basin located in Inner Mongolia, China, where coal and uranium coexist. Water inrush disasters have always been one of the main disasters that threaten the safety of coal mine production, and thus, the study and division of groundwater potential regions are of great significance for the prevention of water inrush disasters and in situ leaching of sandstone-type uranium ore. A new method combining truncated Gaussian simulation and sedimentary facies control was established to predict the groundwater potential area. Taking a typical aquifer, the Zhiluo Formation, as an example, based on high-resolution sequence stratigraphy, geophysics, sedimentary geology, and geostatistical theory, the plane distribution of sand bodies was predicted. Furthermore, the relationship between rock porosity and electricity porosity was established to calculate the regional porosity. Combined with truncated Gaussian simulation and facies-controlled modeling methods, a facies-controlled heterogeneous property model was established to analyze the heterogeneous effective porosity of the aquifer in the study area. Groundwater potential areas were quantitatively evaluated by 3D modeling analysis. The results of the evaluated model were verified by actual data and provide a geological guarantee for the accurate mining of deep coal and uranium ore. A 3D distributed model of chemical elements, which is meaningful for in situ leaching uranium mining, is expected in future research.

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Prediction analysis model for groundwater potential based on set pair analysis of a confined aquifer overlying a mining area

Cited by 17 publications

References 51 publications

Risk Assessment of Water Inrush from Coal Seam Roof Based on Combination Weighting-Set Pair Analysis

Risk Assessment of Water Inrush from Coal Seam Roof Based on Combination Weighting-Set Pair Analysis

Study on the Evolution of Fault Permeability and the Retention of Coal (Rock) Pillar under the Mining Conditions of Thick Coal Seam in the Footwall of Large Normal Fault

3D Quantitative Prediction of the Groundwater Potential Area─A Case Study of a Simple Geological Structure Aquifer

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