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The Role of fracture structure in Leachate Pollution at Landfills:A Case Study of a Landfill in Chongqing City

Acta Geologica Sinica(English Edition) 2008年第5期82卷 1020-1026页

作者： LUO Yunju LIU Dongyan LI Xiulan ZHU Zhengwei College of Civil Engineering Chongqing University Chongqing 400045

This paper studies a landfill where there are three faults running through. As serious pollution has occurred to the geological environment, the landfill is to be closed up and renovated. The paper aims to explore the role of fracture structure in leachate pollution at the landfill. The research was carried out in several stages. First, mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established. And then, the boundary conditions and parameters of the two mathematical models were determined. The groundwater level of the landfills was simulated in order to modify the two mathematical models. As a result, a feasible mathematical model was achieved. Based on this model, a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly, the impacts of the fracture structure on the pollution of leachate at the landfills could be identified. The study results show that while faults contribute to the migration of ieachate, they also serve as a confluence of leachate, thus further deteriorating the environment. The COD concentrations of the inside leachate and the outside leachate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post-renovation landfill. Therefore, measures must be taken to handle the ieachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control.

关键词： landfill fracture structure leachate COD concentration seepage

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Experimental study of coal flow characteristics under mining disturbance in China

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International Journal of Coal Science & Technology 2022年第5期9卷 32-47页

作者： Lei Zhang Zihao Kan Cun Zhang Jun Tang State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou 221116JiangsuChina School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

With annually increased coal mining depth,gas extraction becomes more and more *** gas extraction efect depends on coal seam permeability,which,in turn,is afected by many factors,including loading and unloading stresses and strains in the coal *** induce internal cracks,resulting in cleats and gas emission channels,the coal seam permeability permanently changes *** clarify the stress-induced efects on coal seam permeability,this survey summarized the available approaches used to link the stress path and seepage law in the coal body seepage law,which can be classifed into two design methods:single load variation and combined feld mining *** characterization methods used to observe the surface of coal samples and three-dimensional reconstruction include electron microscopy,CT scanning,and Nuclear Magnetic Resonance(NMR).According to the stress paths designed by the above two approaches,the seepage laws and similarities of three kinds of coal samples with the fractured structure were summarized in this *** following directions are recommended to study the seepage law of coal bodies with three kinds of fractured structures under ***,the stress path of the experimental coal body should be designed by the combined feld mining *** stressed environment of a deep coal seam is complicated,and the axial and confning pressures change ***,one cannot fully refect the real situation on-site by studying permeability evolution ***,during the coal seam mining,the stressed state changes from time to time,and the development of coal seam fractures is afected by *** studying the stress efect on seepage of coal samples,the fractured structure of coal samples should be ***,the available structural characterization methods of coal samples can be combined with the 3D printing technology,which would produce artifcial samples with the fractured structure characteristics of na

关键词： Stress loading and unloading Structural characterization Permeability fracture structure Broken coal

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A Grey Fuzzy Comprehensive Model for Evaluation of Geological structure Complexity

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Journal of China University of Geosciences 2008年第4期19卷 436-440页

作者：周云霞周永章谢淑云曹代勇邱向荣 School of Geographical Science and Planning Sun Yat-Sen University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Department of Earth and Space Science and Engineering York University College of Resources & Safety Engineering China University of Mining and Technolog South China Engineering and Geophysics Technology Development Co.

Several structure sets （faults and folds） are characterized by their self-similarity properties. Herein, we discuss the degrees of complexity of fractures by introducing the box-counting fractal dimension of faults as a key criterion to be used in comprehensive fuzzy analysis model for evaluation of the complexity of structures. Totally, eight criteria including density, intensity, length of faults, types and box-counting fractal dimension of faults, the intersection angle between faults and coal beds, gradient coefficients, dip angles of the coal beds, and variation coefficients of dip angles of the coal seams, were used for the evaluation purpose. The grey fuzzy comprehensive assessment model was used to rank the relative importance of these criteria. Scores indicating the complexity of structure were calculated on the base of criteria values and their weights for each sub-area of the study area in the Pansan （潘三） coal mine district in the southern Anhui （安徽） Province, China. The result on the calculated complexity of structure is useful for mining planning in the study area.

关键词： fracture structure fractal dimension fuzzy comprehensive evaluation

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