Formation mechanisms of paleokarst and karst collapse columns of the Middle Cambrian-Lower Ordovician carbonates in Huainan coalfield, Northern China

Zhang, Haitao; Xu, Guangli; Li, Mingguang; Jian, Zheng; Wang, Minhua; Liu, Mancai; Pan, Shengqiang; Wang, Nan

doi:10.1016/j.jhydrol.2021.126634

Cited by 15 publications

(8 citation statements)

References 68 publications

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“…Zhang et al (2021a, 2021b) used petrological, mineralogical, and geochemical methods to study the formation mechanism of KCCs in the Huainan coalfield, which they also divided into four stages. The first stage mainly occurred from the Middle Carboniferous to the Early Triassic.…”

Section: Resultsmentioning

confidence: 99%

“…Like other areas in Northern China, the Huainan coalfield has experienced multiple stages of tectonic activities, such as the Caledonian movement in the Early Paleozoic and the Indosinian and Yanshanian movements in the Mesozoic (Shu et al, 2017;Xu et al, 2004;Zhang et al, 2022). This formed a large number of faults, folds, and fractures that became important channels for groundwater and hydrothermal fluid migration and promoted the development of paleokarst and KCCs in the Cambrian and Ordovician (Zhang et al, 2021a(Zhang et al, , 2021b. Gao (2018) found that the Huainan coalfield has 718 faults with a drop of greater than 20 m, including 532 normal faults and 186 reverse faults.…”

Section: Geological Settingmentioning

confidence: 99%

“…Mechanical model and roof collapse criterion. Many studies have shown that the evolutionary process of KCCs in Northern China can be divided into two stages (He et al, 2009;Zhang et al, 2021b;Zuo et al, 2009). The first stage is the formation and expansion of the basement cave, which is mainly related to the dissolution of carbonate rocks.…”

Section: Kcc Formation Mechanismmentioning

confidence: 99%

“…Since 1964, KCCs have induced 22 water inrush accidents with volumes of 120-123,180 m 3 /h, which has resulted in huge losses to China and its people (Gui et al, 2017;Yin et al, 2019). Therefore, KCCs are a key concern in research on karst geology and hydrogeology in Northern China coalfields (Zhang et al, 2020a(Zhang et al, , 2021bZhao and Guo, 2014;Zhao et al, 2017Zhao et al, , 2020Zhao et al, , 2021Zuo et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical model and numerical simulation of the formation of karst collapse columns in the Huainan coalfield of Northern China

Zhang

et al. 2023

Energy Exploration & Exploitation

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Karst collapse columns (KCCs) are channels where groundwater and gas gather, and they pose a great threat to mining safety. In this study, a mechanical model and criterion for the roof collapse of KCCs were established, and simulations were performed to analyze the formation mechanism of KCCs in the Huainan coalfield of Northern China. The results showed that the roof collapse and upward development of KCCs were facilitated by increasing the cave radius of the KCC basement and decreasing the groundwater pressure, single-layer thickness of the roof strata, lateral pressure coefficient of the rock mass, and cohesion and internal friction angle between fractures. The KCC formation process in the Huainan coalfield could be divided into four stages: (I) early collapse, (II) middle-early rapid collapse, (III) middle-late slow collapse, and (IV) late filling compaction. The simulation results were generally consistent with actual KCCs observed in the Huainan coalfield, which verified the theoretical analysis. The results of this study provide an important reference for the formation mechanism and evolution of KCCs in Northern China.

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Section: Resultsmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Kcc Formation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical model and numerical simulation of the formation of karst collapse columns in the Huainan coalfield of Northern China

Zhang

et al. 2023

Energy Exploration & Exploitation

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“…With the improvement of research methods and technologies, the formation mechanism, water inrush characteristics, and water disaster prediction and prevention were analyzed. The controlling factors of paleokarst and KCCs in Huainan Mining Area were considered as strata lithology, limestone crack structure, corrosive fluids, and geological structures [10].…”

Section: Introductionmentioning

confidence: 99%

Mechanism Analysis of Delayed Water Inrush from Karst Collapse Column during Roadway Excavation Based on Seepage Transition Theory: A Case Study in PanEr Coal Mine

et al. 2022

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Water inrush disaster is one of the major disasters affecting the production safety of coal mines following roof caving, fire, gas outburst, and dust explosion disasters. It is urgent to reveal the water inrush mechanism and take effective measures to prevent the disasters. More than 80% of water inrush accidents occur around geological structural zones such as faults and karst collapse columns (KCCs). The water inrush events from KCCs caused huge economic losses and heavy casualties, and the water inrush process often shows certain hysteresis characteristics. Taking the water inrush disaster from a KCC during roadway excavation in PanEr Coal Mine of Huainan Mining Area as the case study, the delayed inrush mechanism of KCC was analyzed from the aspects of floor failure, KCC activation, seepage transition, and water inrush development characteristics. The results show that the rock mechanical properties and the excavation depth are the main factors affecting the floor failure characteristics. The seepage transformation from pore flow to fracture flow and pipeline flow, with the change in internal composition structure, is the internal mechanism of the delayed water inrush from KCC. The research is of great significance for the prediction and prevention of water inrush disasters from KCCs.

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Distribution, sources, and ecological risk assessment of HCHs and DDTs in water from a typical coal mining subsidence area in Huainan, China

Chen

Gao

et al. 2022

Environ Sci Pollut Res

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Formation mechanisms of paleokarst and karst collapse columns of the Middle Cambrian-Lower Ordovician carbonates in Huainan coalfield, Northern China

Cited by 15 publications

References 68 publications

Mechanical model and numerical simulation of the formation of karst collapse columns in the Huainan coalfield of Northern China

Mechanical model and numerical simulation of the formation of karst collapse columns in the Huainan coalfield of Northern China

Mechanism Analysis of Delayed Water Inrush from Karst Collapse Column during Roadway Excavation Based on Seepage Transition Theory: A Case Study in PanEr Coal Mine

Distribution, sources, and ecological risk assessment of HCHs and DDTs in water from a typical coal mining subsidence area in Huainan, China

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