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Evolution law of pulsating seepage and thermal deformation by injecting high-temperature steam into coal for thermal coalbed methane recovery

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Deep Underground Science and Engineering 2025年第1期4卷 119-131页

作者： Zhiqiang Li Junliang Li Jinsheng Chen Ali Karrech Ningchao Zhang Ju Chang Kaiqi Jin Yangyang Yu Hongbin Wang Aijie Wang MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic UniversityJiaozuoChina Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic UniversityJiaozuoChina School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuoChina Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic UniversityJiaozuoChina School of Engineering The University of Western AustraliaPerthAustralia

Chinese coal reservoirs are characterized by low pressure and low permeability,which need to be enhanced so as to increase ***,conventional methods for permeability enhancement can only increase the permeability in fractures,but not the ultra-low permeability in coal *** to enhance such impermeable structures lead to rapid attenuation of gas production,especially in the late stage of gas *** stimulation by injecting high-temperature steam is a promising method to increase gas *** critical scientific challenges that still hinder its widespread application are related to the evolution law of permeability of high-temperature steam in coal and the thermal deformation of *** this study,an experimental approach is developed to explore the high-temperature steam seepage coupled with the thermal deformation in coal under triaxial *** tests were conducted using cylindrical coal specimens of?50 mm×100 *** permeability and thermal strain in coal were investigated when high-temperature steam was injected at151.11,183.20,213.65,and 239.76°*** experimental results reveal for the first time that as the amount of injected fluid increases,the steam permeability shows periodic pulsation *** paper introduces and explains the main traits of this discovery that may shed more light on the seepage *** the injected steam temperature increases,the amplitude of pulsating permeability decreases,whereas the frequency increases;meanwhile,the period becomes shorter,the pulsation peak appears earlier,and the stabilization time becomes *** average peak permeability shows a“U-shaped”trend,decreasing first and then increasing as the steam temperature ***,with the extension of steam injection time,the axial,radial,and volumetric strains of coal show a stage-wise expansion characteristic at different temperatures of steam injection,except for the radial strains at 151.11°C.A two-phase flo

关键词： coalbed methane permeability pulsation steam thermal deformation two-phase flow

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界面角度对煤充结构体巴西劈裂特征影响的实验和数值模拟

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Journal of Central South University 2023年第1期30卷 189-201页

作者：史旭东冯国瑞白锦文朱淳王善勇王凯崔博强宋诚 College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Coal Resources in Western China Xi’an University of Science and TechnologyXi’an 710054China School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China Priority Research Centre for Geotechnical Science and Engineering School of EngineeringThe University of NewcastleCallaghanNSW 2308Australia

煤柱和充填体作为复合结构共同承担覆岩载荷。煤柱和充填体之间的界面失稳会诱发复合结构的整体失稳。本文通过室内巴西劈裂实验研究了不同界面角度煤充结构体的破坏类型,强度-声发射-数字图像相关响应特征。利用颗粒流数值模拟软件研... 详细信息

煤柱和充填体作为复合结构共同承担覆岩载荷。煤柱和充填体之间的界面失稳会诱发复合结构的整体失稳。本文通过室内巴西劈裂实验研究了不同界面角度煤充结构体的破坏类型,强度-声发射-数字图像相关响应特征。利用颗粒流数值模拟软件研究了试样的微裂纹,接触力分布和位移矢量演化规律。结果表明:不同界面角度煤充结构体共发生了三种类型破坏;随着界面角度增大,试样的破坏类型从类型Ⅰ转变为类型Ⅰ-Ⅱ,最后转变为类型Ⅲ;不同界面煤充结构体的强度-声发射-DIC特征与破坏类型相对应;随着界面角度的增大,试样内接触力的分布从加载方向向界面法向演化。煤体元件和充填体元件上的裂纹主要为拉伸裂纹,界面上的裂纹为拉伸,剪切或拉剪复合裂纹。

关键词：煤充结构体界面角度巴西劈裂加载劈裂特征

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Study on the mechanism of influence of group extraction on low-temperature spontaneous combustion characteristics of lignite

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Fuel 2025年 401卷

作者： Chen, Changming Guo, Jun Wen, Hu Liu, Yin Gao, Bo Wu, Yunfei Quan, Yanping College of Safety Science and Engineering Xi'an University of Science and Technology No. 58 Yanta Mid. Rd. Shaanxi Xi'an 710054 China National Mine Rescue (Xi ’an) Research Center Xi'an 710054 China Key Laboratory of Western Mine Mining and Disaster Prevention and Control Ministry of Education Xi'an 710054 China

The reaction of microscopic active groups of coal molecules with oxygen atoms to generate heat is the internal cause of spontaneous combustion. To clarify the influence of the change of the content of key active groups of coal molecules on the spontaneous combustion of coal in the low temperature oxidation stage. There were four extraction reagents (cyclohexane, cellulase, tea polyphenols, tetrahydrofuran) chosen for the extraction experiments. Combined with FTIR, TG/DSC and temperature-programmed experiments, changes in microscopic active group content and macroscopic oxidation characteristic parameters of lignite before and after extraction were studied. The influence of solvent extraction efficiency and key active group content on the spontaneous combustion characteristic parameters was examined through correlation analysis. According to our findings, both volume fraction of oxidation products and surge point of oxygen consumption in low-temperature stage are obviously delayed, whereas reactivity and thermal physical strength are weakened. There are differences in the impacts of key active group levels in coal on the coal spontaneous combustion characteristic parameters. The weakening of coal spontaneous combustion at low temperature stage is due to the combined action of the decreased active group level in coal, the decreased reaction activity intensity, the decreased coal weight loss and the decreased thermal effect intensity. The research results provide a theoretical basis for the subsequent reduction of key active groups to block coal spontaneous combustion. © 2025 Elsevier Ltd

关键词： Coal spontaneous combustion Group content Lignite coal Low temperature stage Solvent extraction

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Preparation of a Viscous Hydrogel and Research on its Flame-Retardant Properties

SSRN

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SSRN 2022年

作者： Shi, Mengli He, Zhenglong Zhang, Qian Liang, Yuntao Tang, Hui Hu, Xiangming Xue, Di Wang, Wei Qi, Guansheng College of Safety and environmental engineering Shandong University of Science and Technology Shandong Qingdao266590 China State Key Laboratory of Mining Lab Disaster Prevention and Control Co-found by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Shandong Qingdao266590 China State Key Laboratory of Coal Mine Safety Technology China Coal Technology & Engineering Group Corp Shenyang Research Institute Fushun113122 China

The spontaneous combustion of coal restricts the development of green coal mining. Hydrogels are often used to block air leaks and prevent the spontaneous combustion of coal, but traditional hydrogels suffer from poor adhesion and mobility;therefore, to prevent the spontaneous combustion of coal and improve the utilization rate of hydrogels, this study proposes a new type of fire-extinguishing viscous hydrogel, polyacrylic acid-sodium alginate-tannic acid (PAA-SA-TA). The viscosity, air plugging and blocking characteristics, adhesion mechanism, air plugging efficiency, and thermal stability of the PAA-SA-TA hydrogel were analyzed. The results showed that the viscosity of the PAA-SA-TA hydrogel was about 70% higher, and the blocking efficiency and blocking rate were 42.90% and 39.53% higher than those of a poly acrylic acid (PAA) hydrogel, respectively. In addition, the fire extinguishing tests showed that compared with PAA and polyacrylic acid-tannic acid (PAA-TA) hydrogels, PAA-SA-TA evenly covered the surface of the burning coal body, densely wrapped the coal body, filled the cracks, and extinguished the fire without re-ignition. This study provides a new viscous hydrogel for the prevention and control of the spontaneous combustion of coal in mines. © 2022, The Authors. All rights reserved.

关键词： Hydrogels

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Novel Dynamic Multiscale Model of Apparent Diffusion Permeability of Methane through Low-Permeability Coal Seams

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Energy & Fuels 2021年第9期35卷 7844-7857页

作者： Zhiqiang Li Jiansong Peng Lin Li Lingling Qi Wai Li MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University Jiaozuo 454000 China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic University Jiaozuo 454000 China Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region (Henan Province) Henan Polytechnic University Jiaozuo 454000 China Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University Jiaozuo 454000 China School of Engineering The University of Western Australia Crawley WA 6009 Australia

The low permeability of coal seams is a key factor restricting gas extraction. The multiscale pores in low-permeability coal make coal permeability present the multiscale characteristics. However, the conventional steady-state method cannot measure the multiscale permeability of low-permeability coal well. In this study, a unidirectional multiscale dynamic apparent diffusion model is proposed as an analytical model, and a multiscale dynamic apparent diffusion coefficient is defined. In addition, an experimental method for measuring low permeability from macroscale to microscale pores is provided. The experiments of gas desorption flow in the unidirectional, radial, and spherical directions were conducted to compare with each other. The research results show that (1) the apparent diffusion coefficient and apparent permeability decrease with time because of the multiscale pore structure in coal. (2) The multiscale dynamic apparent diffusion model can accurately describe the full-time process of the unidirectional gas desorption flow in coal. (3) The proposed model shows a broader applicability with a comparison to the current models.

关键词： Transport properties Coal Desorption Diffusion Permeability

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Effect of water immersion pressure on oxidation characteristics and spontaneous combustion characteristics of long-flame coal

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Energy 2024年 291卷

作者： Lin Li Tiantian Liu Xiangjun Chen Yifan Huang Yongliang Xu Zhiqiang Li Lin Wang Lingling Qi Shufan Zhang Rongqing Zhang Xiangyang Ye College of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan 454003 China MOE Engineering Center of Mine Disaster Prevention and Rescue Henan Polytechnic University Jiaozuo Henan 454003 China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Henan Polytechnic University Jiaozuo Henan 454003 China Henan Provincial Key Lab of Gas Geology and Control-Cultivation Base of Provincial and Ministry Joint State Key Henan Polytechnic University Jiaozuo Henan 454003 China School of Engineering The University of Western Australia (UWA) Perth 6009 Australia

Coal seam water injection has an obvious effect on coal dust prevention. The high-pressure water environment of coal seam water injection changes the structure of coal which brings new effects on the characteristics of coal spontaneous combustion disaster. To reveal the effects of water immersion pressure on the oxidation characteristics of long-flame coal, coal samples immersed in water at 0.1 MPa, 2.5 MPa, 5.0 MPa, 7.5 MPa and 10.0 MPa were prepared. Four experiments were conducted to study the changes in oxidation characteristics and its main reasons. The results showed that elevated water immersion pressure promoted the spontaneous combustion tendency of coal, and the composite judgment index of coal decreased to 521.1. Coal immersed in pressurized water entered the stages of oxygen-absorbing oxidation and thermal decomposition earlier than coal immersed in atmospheric pressure water. The specific surface area and average pore diameter of coal immersed in high-pressure water increased, where the pore volume proportion of mesopores of the coal immersed in water at 10.0 MPa increased by 138.5 % compared with that of the coal immersed in atmospheric pressure water. The elevated water immersion pressure prompted coal to produce further aliphatic hydrocarbons and hydroxyl groups, which improved the low-temperature oxidation capacity.

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Test research on advance abutment pressure caused by coal mining based on optical fiber monitoring

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IOP Conference Series: Earth and Environmental Science 2021年第4期861卷

作者： Wengang Du Jing Chai Dingding Zhang Zhe Ma Yongliang Liu College of energy engineering xi'an university of science and technology xi'an 710054 China College of safety science and engineering xi'an university of science and technology xi'an 710054 China Xi'an university of science and technology ministry of education of the western mining and mine disaster prevention and control of key laboratory xi'an 710054 China

The strata movement and deformation caused by underground mining activities is a typical 'black box' problem, it is difficult to grasp the structural characteristics of complete overburden and the law of ground pressure. Abutment pressure is the vertical supporting force acting on coal and rock mass due to the redistribution of surrounding rock stress caused by underground engineering excavation. The distributed optical fiber and fiber Bragg grating are implanted into the physical similar model to monitor the distribution characteristics of abutment pressure in front of the working face during the whole excavation process. The results show that FBG monitoring to reach the peak strain needs to meet two conditions: the working face passes under it, and the cantilever beam structure above the working face is unstable and collapses, and the grating is located at the end of the suspended fixed beam. When FBG is located in front of the working face, the whole process is divided into four stages: 150-81 m from the grating is the weak influence area; 81-49.5 m is the significant influence area; 49.5-21 m from the grating is the severe influence area; 21-0 m from the grating is the influence recovery area. Based on this, the abutment pressure distribution model of FBG sensing detection is given. The influence range is within 81 m, the peak value is 21 m in front of the working face, and the pressure relief area is directly above the working face. The distributed optical fiber monitoring results show that the upward compressive stress value of the abutment pressure affected area decreases rapidly, and enters into the high roof tensile stress affected area. The tensile stress distribution presents a single peak shape, and gradually decreases after reaching the peak until it returns to the elastic area. The research results provide a new research idea for abutment pressure monitoring caused by mining.

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Mechanism and control of spalling for friable sandstone pillars in a room and pillar mine

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Journal of Engineering Science and Technology Review 2018年第6期11卷 197-205页

作者： Ziwei, Ding Jindui, Jia Amirhossein, Bagherieh Ji, Li Yue, Song School of Energy Xi'an University of Science and Technology Xi'an710054 China Anhui Province Key Lab. of Mining Response and Disaster Prevention Control in Deep Coal Mine Anhui University of Science and Technology Huainan232001 China Department of Mineral engineering New Mexico Institute of Mining and Technology SocorroNM87801 United States

The ability to efficiently control sandstone pillar spalling is extremely important in ensuring the safety and highefficiency production of sandstone mines. The increase in size is usually suggested as a remedy for pillar spalling, but none of the suggested remedies reflect the influences of geotechnical properties of rock mass on stability control. Some sandstone mining practices have proven that increasing the size of pillars cannot effectively control pillar spalling. The relationship between the strength of St. Peter sandstone pillar and pillar loads was theoretically analyzed in the current study, in order to examine the influences of geotechnical parameters of sandstone on the stability of pillars and control pillar spalling. The key geotechnical parameters that influence the stability of sandstone pillars were also examined. Subsequently, the pillar instability mechanism and influences of geotechnical parameters on pillar stability were investigated by Finite Difference Method. Finally, a ground control method using shotcrete on pillar was proposed for increasing the stability of pillars. Results demonstrate that compressive stress on the St. Peter sandstone pillar is considerably larger than the compressive strength after mining, resulting in the evident deformation of most regions. The relation curves of displacement at the pillar top with internal friction angle and cohesion are in the power functional distributions, but the change of cohesion is more significant in the pillar strength. The displacement at the pillar top gradually decreases with the increase in internal friction angle, whereas the plastic failure regions of pillars gradually decrease from the bottom to the upper parts with the increase in cohesion. A field industrial test proves that shotcrete on pillars can increase pillar strength, which effectively controls the pillar spalling. Research results provide theoretical and practical guidelines to enhance the stability of pillars under the sa

关键词： Rock mechanics

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Elastic-plastic analysis of surrounding rock in deep roadway considering shear dilatancy property under non-uniform stress field

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Journal of Engineering Science and Technology Review 2017年第4期10卷 16-24页

作者： Chuan-Ming, Li Wen-Bao, Shi Wan-Rong, Liu Rui-Min, Feng School of Resource and safety Engineering Anhui University of Science and Technology Huainan Anhui232001 China Anhui Province Key Lab. of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and Technology Huainan Anhui232001 China School of Physics Science and Information Engineering Liaocheng University Liaocheng Shandong252059 China Department of Mining and Mineral Resources Engineering Southern Illinois University CarbondaleIL62901 United States

The surrounding rock of deep engineering roadway is under the complicated mechanical environment of non-uniform stress distribution, and the stress mechanical model of uniform distribution is obviously different from the surrounding rock of roadway in real stress state. Thus, accurately evaluating the stress and deformation state of surrounding rock is infeasible in non-uniform stress field when employing the mechanical model developed for uniform stress conditions. To reflect the real mechanical state of the roadway surrounding rock accurately and calculate the radius of the plastic zone in roadway surrounding rock precisely, a mechanical model of roadway surrounding rock under non-uniform stress conditions was established in this study based on unified strength theory. One floor roadway of 1231 (1) working face in Panyi coal mine of Huainan coal field was considered as an example. The influences of side pressure coefficient and intermediate principal stress on the scope of the plastic zone in surrounding rock were analyzed. The effect of shear dilatancy property on the deformation and failure process of surrounding rock was discussed, and the field monitoring and verification of the scope of the plastic zone in surrounding rock were conducted on the floor roadways of 1231 (1) and 1252 (1) working face in this mine. Research results indicate that the displacement of the plastic zone enlarges by nearly thrice while the side pressure coefficient increases, and the radius of the plastic zone in roadway surrounding rock in the vertical direction is obviously larger than that in the horizontal direction, which reflects an anisotropic characteristic of the surrounding rock of deep roadway. The displacement of the plastic zone in the surrounding rock enlarges by at least 60% while the shear dilatancy parameter increases, but the morphological change of the plastic zone is minor. Furthermore, the displacement of the plastic zone in the surrounding rock reduces by nearly 35

关键词： Floors

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Elastoplastic analysis of tunnel surrounding rocks based on the statistical damage constitutive model

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Journal of Engineering Science and Technology Review 2016年第3期9卷 27-34页

作者： Zhu, C.Q. Yin, Z.Q. Li, C.M. Feng, R.M. Anhui Province Key Lab. of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and Technology Huainan Anhui232001 China School of Resource and Safety Engineering Anhui University of Science and Technology Huainan Anhui232001 China Department of Mining and Mineral Resources Engineering Southern Illinois University Carbondale CarbondaleIL62901 United States

Accurately determining the stress status of surrounding rocks is difficult as stress in surrounding rocks is redistributed after tunneling. A constitutive model selection of surrounding rocks based on the pre-peak strain hardening characteristics of surrounding rocks is considered to further analyze the mechanical characteristics of tunnel surrounding rocks. Theoretical analysis and analytic calculation were conducted on the stress distribution and the deformation characteristics of tunnel surrounding rocks in this study. The evolution laws of stress, as well as the strain of the elastoplastic zone of tunnel surrounding rocks, and the plastic zone radius along with strain hardening and other relevant factors were also analyzed. Results show that, in view of strain hardening, the mechanical characteristics of surrounding rocks increasingly approaches that of reality and the plastic zone radius achieved is larger than the result of the Kastner solution. Moreover, when the strain hardening stage is shortened, the plastic zone radius initially decreases and then slightly increases;tangential strain and displacement increase in varying degrees as the radial strain gradually decreases;tangential stress peak gradually increases and the sudden change of its distribution curve becomes increasingly evident although radial stress changes are less obvious;and sensitivity of the radius and displacement of the surrounding rock plastic zone that support resistance increase with the increase in mining depth. As a result, the research findings solve, to a certain degree, the problem that the constitutive model of surrounding rocks failed to reflect the true characteristics of surrounding rocks, providing the theoretical foundation of stability analysis and supporting the design of tunnel surrounding rocks.

关键词： Strain hardening

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