Article
Energy & Fuels
Fatemeh Soleimani, Guangyao Si, Hamid Roshan, Zhenyu Zhang
Summary: Coal and gas outburst is a common mining hazard that is difficult to predict due to complex processes involved. Current thresholds for outburst prediction are based on empirical methods and fail to consider the physical processes. Numerical modelling is a powerful tool to understand the physical mechanisms, but the use of thresholds for outburst initiation has not been adequately explored.
Article
Engineering, Environmental
Wencheng Song, Zhengzhao Liang
Summary: Mining activities above an aquifer, especially in the hanging wall of normal faults, carry the risk of water inrush. Research shows that fault activation is positively correlated with the advancing distance and negatively correlated with the fault dip angle, suggesting that a smaller fault dip angle may lead to an earlier formation of water-inrush channels.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Liang Cheng, Jiang Xu, Shoujian Peng, Lei Qin, Fazhi Yan, Yang Bai, Bin Zhou
Summary: Coal-and-gas outburst (CGO) is a major challenge in coal mining, and the initial gas pressure has a significant influence on the flow characteristics of CGO airflow. The study found that the gas pressure decreases periodically or continuously during the CGO process, and the static pressure in the roadway shows alternating positive-negative pressure transition. The increase in coal seam initial gas pressure leads to higher velocity and longer duration of high-speed airflow in the roadway.
NATURAL RESOURCES RESEARCH
(2022)
Article
Energy & Fuels
Zhengshuai Liu, Longyong Shu, Zhonggang Huo, Yongpeng Fan
Summary: Most coal and gas outbursts occur in the coal thickness variation zone, but it is difficult to explain the mechanism of outbursts in coal thickening areas through physical simulation experiments. By establishing a coupled multi-field model, this study investigated the evolution of stress, gas pressure, and plastic failure zones in coal seams with different variation gradients and amplitudes of coal thickness. The research provides theoretical support for preventing and controlling outbursts in coal seam thickening areas during mining.
Article
Energy & Fuels
Hui Cheng, Hongbao Zhao, Dongliang Ji, Luyang Cui
Summary: This study analyzed the stress field and control technology of stress relief gas in a coal mine, using numerical simulation, theoretical analysis, and field practice. The optimized layout of boreholes was proposed, which provided useful information for the ventilation mode selection of the working face. The technology used in the 1103 working face has practical applications and can be applied to other similar mines.
ENERGY EXPLORATION & EXPLOITATION
(2022)
Article
Geosciences, Multidisciplinary
Jinzheng Bai, Linming Dou, Jiazhuo Li, Kunyou Zhou, Jinrong Cao, Jiliang Kan
Summary: The study reveals that coal burst induced by fault slip instability under high-stress conditions is closely related to excavation disturbance and fold structure. The research contributes to a better understanding of the inducing mechanism of fault coal burst.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Geological
Yue Niu, Enyuan Wang, Zhonghui Li, Feng Gao, Zhizhen Zhang, Baolin Li, Xin Zhang
Summary: This study utilizes electric potential (EP) signals generated under the coupling action of stress and gas to real-time monitor and finely identify coal and rock dynamic disaster hazard zones. The study provides a valuable new method for accurately identifying outburst hazards and preventing coal and rock dynamic disasters in deep coal mines.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Zhiheng Cheng, Hui Pan, Quanle Zou, Zhenhua Li, Liang Chen, Jialin Cao, Kun Zhang, Yongguo Cui
Summary: With the increasing demand for coal resources, coal has been mined in deep coal seams, leading to great risks of coal and gas outburst. Protective coal seam mining, as a safe and effective method for gas control, has been widely used. This study investigated stress-seepage coupling laws and permeability characteristics of a protected coal seam during the process of protective coal seam mining.
NATURAL RESOURCES RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yanlei Guo, Haibin Liu, Xu Zhou, Jian Chen, Liwen Guo
Summary: The XGBoost-GR-stacking gas outburst early warning model proposed in this article demonstrates high accuracy and practical performance, making it suitable for gas outburst risk warning in mining safety. The model is based on gas outburst data from 26 mines and establishes a data generation model based on XGBoost. Grey correlation analysis is used to select the main control factor groups based on the sorting of correlation degrees. Comparing the actual and predicted values for each model, the stacking fusion model achieves the highest accuracy in gas outburst prediction and the best model fitting effect.
APPLIED SCIENCES-BASEL
(2023)
Article
Geosciences, Multidisciplinary
Hai Rong, Shiqi Yu, Weihua Song, Guoshui Tang, Yadi Wang, Dequan Sun, Bingjie Huo
Summary: With the increasing of mining depth and intensity, coal and gas outburst has become one of the most destructive and harmful dynamic disasters in coal mines. This study aims to investigate the correlation between coal and gas outburst and natural earthquakes, using the principles of disaster prevention, seismology, statistics, and geophysics. The research results show that natural earthquakes can induce abnormal gas emissions in coal mines, especially in weak plane structures. There is a unified mechanism for the occurrence of natural earthquakes and coal and gas outburst, and there are correlations between space and intensity. The findings provide new insights for predicting these two types of disasters.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Environmental
Wei Yang, Wenxiao Zhang, Baiquan Lin, Guangyao Si, Jianguo Zhang, Jianli Wang
Summary: The paper demonstrated a novel integrated mining system in the 12th coal mine of the Pingdingshan coalfield, which extracted two panels simultaneously to effectively mine thin protective coal seams and control gas outbursts. This system not only increased mining efficiency, but also reduced surface mining footprint and cost of gangue handling.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Geosciences, Multidisciplinary
Shaoyong Shang, Qinghua Zhang, Yinghua Zhao, Yong Diao, Jiakuan Yin, Yuheng Che, Xiaotong Kang, Bo Zhao
Summary: In this study, a large-scale true triaxial apparatus was developed to investigate the mechanism of coal and gas outbursts and the evolution of mining-induced stress. The experiments showed that coal and gas outbursts occur within a limited balance area due to both stress and gas pressure. Under mining-induced stress, the compression of surrounding rock and coal accumulates elastic potential, providing energy for outbursts. The development and expansion of fractures in the coal body caused by mining-induced stress result in coal wall deformation and damage. This study contributes to a classification scheme and management strategies for outbursts.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Qingyi Tu, Yuanping Cheng, Sheng Xue, Ting Ren
Summary: The study reveals that the particle size of tectonic coal decreases during the formation process, leading to significant changes in pore structure and initial gas desorption characteristics. The reduction in particle size has a crucial impact on the initial gas desorption capacity of tectonic coal, making it essential for gas energy release in the outburst process.
Article
Geosciences, Multidisciplinary
Zhuang Lu, Liang Wang, Mingzhe Lv, Yang Lei, Hao Wang, Qingquan Liu
Summary: This study provides new insights into the theoretical study of coal and gas outburst in serious outburst coal seams and the control of coal and gas outburst by hydraulic measures.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Environmental
Wei Yang, Wenyuan Wang, Ru Jia, Gabriel Walton, Sankhaneel Sinha, Qinghe Chen, Baiquan Lin, Xiangdong Jiao
Summary: This paper systematically investigates the effects of different parameters on de-stress blasting performance. The study finds that filling the blast hole with water greatly improves blasting power and reduces blast wave transmission. Forward blasting enhances the transmission of the blasting wave deeper into the coal seam and increases the length of the stress relief zone in front of the coal face.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Zheng Shang, Haifeng Wang, Yuanping Cheng, Bing Li, Jun Dong, Qingquan Liu
Summary: This study examined the effective range, efficiency, cost, and applicable conditions of surface well drilling and net-like penetrating boreholes for pressure-relief gas extraction. The results showed that surface wells have higher gas extraction concentration and purity compared to NPB.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Xiangjun Chen, Liyang Li, Yuanping Cheng, Lingling Qi
Summary: This study investigates the influence of water injections on coalbed methane recovery. The results show that the injected water can replace the adsorbed methane, and the replacement ratio and quantity of methane increase with the increasing quantities of injected water. This suggests that water injections can further enhance CBM recovery.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Congmeng Hao, Yuanping Cheng, Hongyong Liu, Liang Wang, Qingquan Liu
Summary: The new technology, assisted by mechanical cutting with waterjet, effectively increases gas drainage efficiency in coal seams and reduces mining costs.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Chemistry, Physical
Gernot Rother, Siddharth Gautam, Tingting Liu, David R. Cole, Andreas Busch, Andrew G. Stack
Summary: The adsorption behavior of water vapor in silica nanopores with different pore morphologies and surface hydrophilicities was studied. The study found that the adsorption isotherms are largely independent of pore size at low pressure, and the adsorbed amounts scale with the surface hydroxyl density. Patchy adsorbed layers were found in narrow pores, while a second adsorbed water layer was formed on larger pores and planar quartz surfaces. Molecular dynamics modeling revealed two preferential orientations for water molecules adsorbing to surface hydroxyl groups.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Chemical
Amirsaman Rezaeyan, Vitaliy Pipich, Jingsheng Ma, Leon Leu, Timo Seemann, Gernot Rother, Lester C. Barnsley, Andreas Busch
Summary: In this study, small-angle neutron scattering experiments were conducted on 71 samples from 13 different sets of mudrocks across the globe to capture the pore structure and develop fractal models to predict transport properties based on pore size distributions. The results show that transport phenomena in mudrocks are pore size-dependent, with different flow regimes developing in micropores, meso- and macropores based on hydrostatic pore pressures. The new model of pore size-dependent transport and integrated transport properties using fractal models provides a systematic approach to better understand fluid flow and transport phenomena in mudrocks on the reservoir and basin scale.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Engineering, Chemical
Amanzhol Kubeyev, Nathaniel Forbes Inskip, Tomos Phillips, Yihuai Zhang, Christine Maier, Kevin Bisdom, Andreas Busch, Florian Doster
Summary: This paper presents a computational model based on digital image processing techniques for the stress-permeability relationship of fractures. Using a first-principle contact mechanics approach, numerical simulations are conducted to investigate the effects of fracture surface roughness and shifting on permeability evolution under applied stress. The results are compared with laboratory experiments, and empirical stress-permeability relationships are provided for fractured geological formations.
TRANSPORT IN POROUS MEDIA
(2022)
Article
Green & Sustainable Science & Technology
Jeroen Snippe, Niko Kampman, Kevin Bisdom, Tim Tambach, Rafael March, Christine Maier, Tomos Phillips, Nathaniel Forbes Inskip, Florian Doster, Andreas Busch
Summary: In this paper, the DETECT experimental-modelling workflow is applied to the Green River site in Utah to analyze a rare case of natural CO2 reservoir leakage. The methodology accurately predicts leakage locations and rates, providing valuable insights into CO2 leakage mechanisms along faults.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Environmental Sciences
Kaiqing Xu, Wei Qiao, Guanghui Zhu, Lushun Feng, Zhiwen Wang, Wenping Li
Summary: This study conducted research on the groundwater system in the Yanzhou coalfield. The results showed that the groundwater in the area is alkaline and the Ordovician limestone aquifer is different from other aquifers. During the hydrogeochemical evolution of the groundwater, carbonate and sulfate dissolution occurred more frequently, cation exchange was more pronounced, while silicate weathering and halite dissolution were less significant.
Article
Chemistry, Physical
Zaid Jangda, Hannah Menke, Andreas Busch, Sebastian Geiger, Tom Bultreys, Helen Lewis, Kamaljit Singh
Summary: This study investigates the pore-scale displacement processes in H-2-brine systems in a porous sandstone. The findings suggest that underground H-2 storage may be a suitable strategy for energy storage, but further research is needed to fully understand the pore-scale interactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Geology
Andreas Busch, Suzanne Hangx, Stephanie Vialle, Roberto Emanuele Rizzo, Niko Kampman
Summary: The long-term interaction of CO2-charged fluids with low permeability cap rocks is important for seal integrity assessment. A study on a natural CO2 analogue near Green River, Utah, USA, showed that over time and small distances, mechanical weakening of the cap rock due to fluid-rock interactions can occur, leading to loss of cohesion, compaction, and formation of fractures. However, considering the thickness of cap rocks above CO2 storage reservoirs, the risk of losing containment integrity over hundreds to thousands of years is not significant.
Article
Environmental Sciences
Yuguang Lyv, Wei Qiao, Weichi Chen, Xianggang Cheng, Mengnan Liu, Yingjie Liu
Summary: The new Shanghai No. 1 Coal Mine is located in a dry and semiarid region with limited water resources. The high-intensity coal mining has caused damage to groundwater resources. To quantify the impact of mining on underground water resources, water release tests were conducted and a three-dimensional numerical model of the groundwater system was established to simulate the drainage phenomenon and predict the discharged water under safe mining conditions.
Article
Energy & Fuels
Amirsaman Rezaeyan, Niko Kampman, Vitaliy Pipich, Lester C. Barnsley, Gernot Rother, Clayton Magill, Jingsheng Ma, Andreas Busch
Summary: The pore structure of mudrocks plays a vital role in evaluating flow behavior, and the relationship between porosity evolution and flow and transport in mudrocks remains insufficiently understood. Organic-rich mudrocks mainly contain large pores, which favor production from unconventional reservoirs. The research findings are of great significance for understanding fluid imbibition and flow properties in mudrocks.
Article
Geosciences, Multidisciplinary
Paula Sofia Gonzalez Samano, Roger Daniel Beckie, Andreas Busch, Aaron Graham Cahill
Summary: Oil and gas wells can experience integrity failure, leading to the release of fugitive gas into the subsurface and atmosphere. This study focuses on understanding the factors influencing fugitive gas migration in the shallow sedimentary rocks of British Columbia, Canada, and developing methods to detect and monitor these gases. Laboratory techniques and analytical calculations were used to characterize flow properties of rock cores and assess the relationship between petrophysical characteristics and flow propensity. Results indicate that capillary pressure and heterogeneity play significant roles in controlling gas migration in the region.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Instruments & Instrumentation
Nick Harpers, Ming Wen, Paul Miller, Suzanne Hangx, Andreas Busch
Summary: This study introduces the Harpers THMC Flow Bench, a multi-cell, flow-through reactor system for the scientific analysis of coupled thermo-hydro-mechanical-chemical processes in rocks. The setup allows long-term testing on rock samples and includes features such as high pressure and axial load capacity, temperature control, and fluid mixing capabilities. Various tests, including permeability measurements, chemical analysis, and mechanical testing, can be performed using the setup.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Geology
Andreas Busch, Suzanne Hangx, Stephanie Vialle, Roberto Emanuele Rizzo, Niko Kampman
Summary: This study investigates the long-term geomechanical changes in a reservoir seal due to fluid-rock interactions with CO2-charged fluids. The study finds that low permeability cap rock undergoes mechanical weakening over time, resulting in the formation of bedding-parallel fractures. However, these mechanical weakening processes only occur over long time scales and small distances, suggesting that the threat to containment integrity is not considerable.