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About the Journal

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Journal:
Coal Geology & Exploration
Establishment year:
1973
 
Periodicity:
Biomonthly
Supervised by:
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.
Sponsored by：
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.
Editor-in-chief:
 DONG Shuning
 
Associate E ditor-in-chief:

 LIU Cheng, James W. LaMoreaux 

 

Executive Editor-in-chief:
JIN Xianglan 

 

ISSN:
1001-1986
CN:
61-1155/P
Web:
www.mdkt.cbpt.cnki.net

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2009年01期目次

  • Coal-mining geological conditions and explorations of deep coal deposits: status and problems

    ZHANG Hong,XIA Yujing,ZHANG Qun,JIN Xianglan,JIN Dewu(Xi′an Branch,China Coal Research Institute,Xi′an 710054,China)

    Coal plays a leading role in both production and contribution of energy sources in China,and it provides guarantee for national economic and social development in excellent coordination.However,the shallow coal re-sources in the old coal mining areas of North and Northeast China have been nearly exhausted,and it is necessary to mine the deep coal resources.Deep coal mines are under the complex mining environment conditions of high in-situ pressure and geotherm,as well as high methane content in coalbed and pore pressure dissipation.Therefore,the exploration and development of the deep coal deposits are both the engineering and the geological problems.According to the analyses of the research status and problems in coal resource exploration and development in our country,the key scientific problems in term of the basic research of occurrence,coal mining-geological conditions and comprehensive exploration of the deep coal deposit are as follow:(i) formation,evolution and occurrence con-ditions of coal-bearing geological bodies;(ii) primary energy fields and coupling reaction of multiple energy-field in deep coal mine;(iii) the origin and source of fluid,permeable flow,occurrence and migratory concentration mechanisms,and the coupling action of multiphase mediums;and(iv) the geophysical anomaly response of the special geological bodies and multiphase mediums,and theory of comprehensive exploration.Constructing the ex-ploration theory,technology-method system of deep coal deposits,will provide the scientific basis for exploiting deep coal resource with optimum beneficial result and safety,and promote the sustainable development of the old coal mining areas in North and Northeast China.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 2709K]

  • Application of grey clustering analysis in evaluation of effective supply capacity of coal resources

    LI Lin1,SANG Shuxun1,HUANG Huazhou1,YI Tongsheng2,XU Hongjie1,LI Jun1(1.College of Mineral Resource and Geological Science,China University of Mining and Technology,Xuzhou 221008,China;2.Guizhou Bureau of Coal Geology,Guiyang 550006,China)

    On the basis of the grey system theory with the evaluation of coal resources,the paper discusses the grey characteristics of evaluation unit of coal resources,analyses the basic principles of evaluation of coal resources with grey cluster,and gives the calculating method in the evaluation of coal resources.Taking 9 evaluation units of coal resources as an example,the comprehensive subjection value was calculated based on 18 evaluation indexes and rating standard(excellent,good,acceptable,poor).The assessment results are obtained as 4 good,4 acceptable,1 poor and the sequence of exploitation is given at last.The results demonstrate that this method is reliable.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 265K]

  • Characteristic of in-situ stress field in Huainan mining area

    HAN Jun,ZHANG Hongwei(College of Resource and Environment Engineering,Liaoning Technical University,Fuxin 123000,China)

    The hollow included technique was used to measure the in-situ stress of Huainan mining area.According the analysis of the measurement data,the characteristic of in-situ stress field is obtained.The result shows that:(1) two principal stresses are nearly horizontal and one is nearly vertical among three principal stresses on all sites.The magnitude of vertical stress is equal to the weight of overburden rock mass.The horizontal principal stress in-creased with the depth;(2) The ratio of major principal stress to minor principal stress did not increase with depth evidently,the difference between major principal stress and minor principal stress is large on 50% sites;(3) The orientation of major principal stress is NE,there is some deflection localy.According to the relation of three prin-cipal stresses,the type of Huainan mining area is dynamic stress field and quasi static stress field.In-situ stress field plays a important role in coal and gas outburst in Huainan mining area.It was suggested that in-situ stress field should be considered during the gas drainage design.

    2009 01 [Abstract][OnlineView][Download 862K]

  • Detachment structures in Lianghuayuan field, Huaibei coalfield

    LIU Chun1,2,SONG Chuanzhong1,ZHANG Wenyong3,ZHAO Yinmu3(1.Hefei University of Technology,Hefei 230009,China;2.Anhui Center for Public Geological Survey and Administration,Hefei 230001,China;3.The Third Exploration Team of Anhui Coalfield Geological Bureau,Suzhou 234000,China)

    In order to find the basic structure framework of Lianghuayuan field for coal resources exploration,the comprehensive and systematic analysis methods are performed by using detachment structure theoretical explana-tion and combined with borehole data,logging data,strata,coal seams and faults were compared.The obtained re-sults indicated that the previous conclusions of horst-graben structures are not correct.The new review is that a detachment structure is the main structure in Lianghuayuan field;two faults(F1 and F8) in eastern and western Li-anghuayuan field are the same concave arc-shaped detachment structure.The Lianghuayuan field is actually a whole mineral production area according to the regional geological background and dynamic feature.These obtained results are of more significance for expanding coal reserve calculation scale and avoiding resources loss.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 438K]

  • Prediction method of coal and gas outburst by distance discriminant analysis

    LIU Jinhai1,2,FENG Tao1,2,XIE Donghai2,LIU Hui2(1.Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China;2.School of Energy and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

    The prediction of coal and gas outburst is taken as the research object.Ten factors such as geological structure,mining depth,initial speed of methane diffusion and so on were selected as prediction indexes.Prediction model of coal and gas outburst was established by using distance discriminant analysis method.The model was trained and tested with the practical data.Finally,the method was applied to example.And the prediction result accords with the fact.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 328K]

  • The effects of stress on fracture and permeability in coal bed

    LI Xiangchen,KANG Yili,LUO Pingya(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

    The development of coalbed methane shows that fracture and permeability of coal bed are two key fac-tors on the success development of China's CBM resource.The paper systematically studied the change law of fracture width and permeability as stress varied in laboratory experiments.The results showed that fracture width and permeability continuously decreased in the process of increasing effective stress;fracture width and perme-ability changed very slowly when stress reached to 8 MPa.Thus,fracture and permeability of coal bed are very sensitive to stress.Results showed that coal bed had strong stress-sensitivity.

    2009 01 [Abstract][OnlineView][Download 1415K]

  • Depositinonal structure planes and their influence on the mechanical properties of sedimentary rock mass

    MENG Zhaoping1,2,LU Pengqing1,HE Xiaohei1(1.Department of Resources and Geoscience,China University of Mining and Technology,Beijing 100083,China;2.China Three Gorges,Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang 443002,China)

    Based on the genetic types of depositional structure planes,the deformation and failure characters are analyzed and their mechanical characteristics and mechanical effects are studied through theoretical analysis and experimental investigation.It is shown that the weak plane of sedimentary structure such as the bedding of weak plane type,sets or cosets plane,bedded plane and unconformity interface will produce main influence on the mechanical properties of sedimentary rock mass.The differences of rock mass’s mechanical properties in parallel and vertical directions of bedding plane are analyzed too.It is displayed that the compressional wave velocity and elastic modulus are lower in vertical directions compared with that of parallel,correspondingly the tensile strength is smaller while the compressive strength and cohesion are contrary.The sedimentary rock mass is prone to produce tensile failure in vertical directions of structure planes and shear failure in parallel directions.Therefore,the rock mass of coal roof tends to generate the destruction phenomenon of separation layer in the direction of stratification plane under the effect of mining.Further,the deformation and failure mechanism is revealed.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 456K]

  • Elastic-viscoplastic analysis of explicit FEM for simulating wave motions in rock mass

    LIU Hongshuai1,2,TANG Liqiang1,BO Jingshan2,3,FENG Zhiren2(1.School of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;2.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;3.Institute of Disaster-prevention and Science and Technology,Sanhe 065201,China)

    The analysis method that can exactly reflect the characteristics of ground motion transmitting is the basis for describing seismic response of rock mass.Based on explicit wave motion finite element method(FEM),a new method was suggested by using an elastic-viscoplastic constitutive model which considered the effect of strain rate on dynamic properties of rock mass.According to this method,a computation program was compiled and was ap-plied in the analysis of uniform rock slope.The slope displacement and stress response to the input of EL-CENTRO wave were calculated.Through comparison with the results of visco-elastic model,the validity of program was verified.The results showed that the new method could be reasonably applied to the calculation of permanent dis-placements and residual stresses of rock slope under earthquake ground motion.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 544K]

  • Characters of sliding soil of the loess landslide: A case study from Jiaoshushuwan, Tianshui

    LI Ruie1,2,XU Haoming3,WANG Juanjuan1(1.Key Laboratory of Structural Engineering and Earthquake Resistance,Ministry of Education,3.Shaanxi Provincial Highway Survey and Design Institute,Xi′an 710068,China) Xi′an University of Architecture and Technology,Xi′an 710055,China;2.Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang′an University,Xi′an 710064,China;

    Loess landslide is the main factor which influences the infrastructure construction such as highway,railway and so on.In certain extent,the formation of the loess landslide is the deformation and destruction of slid-ing soil.The paper made a systemic study including the classification,physical and mechanical properties,the mi-crocosmic and macroscopic properties of the sliding soil.And the deformation and destruction of sliding soil mechanism are explored.At last,the loess landslide case of Tianshui,Gansu Province was analysed.

    2009 01 [Abstract][OnlineView][Download 1100K]

  • Extenics evaluation of the anti-disturbance capability of geological environment

    XIA Yucheng,TANG Lijun,ZHANG Hailong(Department of Geological and Environmental Engineering Xi’an University of Science and Technology,Xi'an 710054,China)

    The reasonable planning of mining strength based on anti-disturbance capacity of geological environ-ment is a precondition to ensure harmonic development of resources exploitation and environmental protection.The anti-disturbance capacity of geological environment depends on tectonic setting elements which include structural medium,shape,fractures and tectonic stress,and is affected by groundwater.Thus the evaluation index system is established including quantitative index and qualitative index.Classification assessment on anti-disturbance ca-pacity of geological environment is essentially a problem of fuzzy pattern recognition.The study application method of extension theory based on matter-element theory and extension set was used to transform contradiction problem into compatible.This method to process the qualitative index quantitatively and to express,the qualitative results quantitatively produced an ideal approach for accurate evaluation of anti-disturbance capability of geologi-cal environment in coal mining area.

    2009 01 [Abstract][OnlineView][Download 216K]

  • Orthogonality analysis of sensibility on factors of slope stability in opencast coal mine

    LI Rongwei1,2,HOU Enke3(1.Baoding water Resources and Hydropower Survey and Design Institute,Baoding 071000,China;2.Sichuan Mine Safety Technology Training Center,Chengdu 610000,China;3.Dept.of Geology and Environment Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

    The stability of composite slope,within first mining area in the 3rd Baiyinhua opencast coal mine,was analyzed.By using the Lizheng software,the stability factor,which was calculated by adopting traditional limit equilibrium method,was considered as an indicator,and the sensitivity of factors,such as seismic effect,cohesion,friction angle,ground-water level and density is smaller in order to the slope stability according to multi-factor sensitivity analysis.The research conclusion coincides with engineering actuality.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 278K]

  • Prediction of water inrush through coal floor based on binary logistic regression model and CART

    LIU Zaibin,JIN Dewu,LIU Qisheng(Xi'an Branch,China Coal Reaserach Institute,Xi'an 710054,China)

    To quantitatively evaluate the information of water inrush through coal floor,and get rules of water inrush,binary logistic regression and classification and regression tree were used to predict water inrush through coal floor.Based on the analysis of water inrush information,a probabilistic predicting model which contained all selected fac-tors was established,a simplified model which contained six main factors was established based on backward stepwise regression method.Rules of coal floor water bursting were found by classification and regression tree method,the re-sult of classification test showed that the classification accuracy of water inrush achieves up to 91.67%.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 293K]

  • The method of resolution matching and depth correction in image logging data processing

    YAN Jianping,CAI Jingong,ZHENG Deshun,SUI Luning(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China)

    Imaging log has been used widely used due to its high resolution and abundant information capacity.Nevertheless,the difficulties may arise from the resolution matching in data processing with the conventional log-ging data,because of high sampling density of imaging log.Traditional interpolation method can not resolve this problem.Conventional logging GR(gamma ray) curve is interpolated by using the Akima interpolation method with high efficiency and precision,and then,the depth displacement of image logging GR curve is calculated by using correlation analysis.The method developed in the present study has the advantages of fast resolution match-ing and depth correction,and will better improve the image interpretation of image logging.

    2009 01 [Abstract][OnlineView][Download 265K]

  • 3D seismic exploration technology for lower coal group in gob area

    ZHANG Guangzhong1,ZHANG Yuncheng2,LI changhe1,SUN yongliang2(1.Xi′an Branch,China Coal Geology Institute,Xi′an 710054,China;2.Xinlong Coal Industry Corporation,Xuchang 461000,China)

    Using 3D seismic exploration technology to survey the location and scope of gob area has achieved good results,but prospecting lower coal group in gob area is still in the exploratory stage.The paper summarized the geophysical characteristics of lower coal group in gob area and analyzed the main factors influenceing exploration results.After multiple tests,we adopted "multiple stacks,single deep-well exciting,large-volum,low-frequency detector,variable parameter of viewing system",the high signal-to-noise ratio seismic information of lower coal group was achieved,indicating that using 3D seismic exploration technology to survey lower coal group is feasible.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 4372K]

  • F-K dispersion analysis of Love guided waves in three layered symmetry model

    REN Yaping,LI Dechun,KANG Yonggan(China University of Mining and Technology,XuZhou 221008,China)

    Due to the long persistent time of the energy of guided waves(including Love and Rayleigh waves) going through the wave guid,the structure parameters the wave brought are more interesting.The paper focuses on Love waves based on F-K method.After calculating the dispersion curve and having got the synthesis records of Love guided waves at a given frequency,having been transforming the synthesis records,we can get the velocity pa-rameters of the wave guide through analyzing.The results are consistent with the parameters we gave before.It is indicated that the F-K method can be used for dispersion analysis of guided wave.

    2009 01 [Abstract][OnlineView][Download 348K]

  • The factors affecting the precision of Rayleigh wave exploration instrument in coal mine

    WANG Xiaobo,WANG Yong(Xi′an Branch,China Coal Research Institute,Xi′an 710054,China)

    Rayleigh wave detection as a shallow seismic detection method,characterized by advantenges of being simple and convenient,has been applied in many fields.The paper analyzes the factors affecting the precision of Rayleigh wave exploration in coal mine and gives construction technology,setting parameters and problem to pay attention to.According to actual situation,channel interval,offset,sampling rate,magnification,hammer-blow times,seismic line layout and reliable collection window were determined.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 207K]

  • Application of polar stereographic projection in the well trajectory design and calculation of directional drilling

    HU Erzhong,PENG Zhenbin(School of Geo-science and Environmental Engineering,Central South University,Changsha 410083,China)

    The stereographic projection is research way through the object three-dimensional space geometry es-sential factors(line,surface) reflected in the projection plane.The article is a research on application of the stereo-graphic projection method to the directional drilling in the trajectory design and calculation,transforms the space problem as the plane question,carries out computation using the spherical triangle related formula,then obtains a series of characteristic parameter formula.The results show that the design method which unifies the stereographic projection and the spherical triangle analytic geometry is one kind of both simple and the quick methods.

    2009 01 [Abstract][OnlineView][Download 399K]

  • The sampling technique analysis and improvement of drilling crumbs

    XU Wenquan,ZHAO Enlai,MA Yankun,SONG Dazhao,BAI Huimin,XU Xiaoyang(Faculty of Safety Engineering,China University of Mining and Technolgy,Xuzhou 221008,China)

    As result of backward equipment and wrong operation,the forecast results become unreliable when the index of drilling yields is used in forecasting coal or rock outburst.The paper analyzed the main reason for those mistakes in the aspect of actual operation and proposed technological improvement on the basis of present equip-ment,and verification by experiments.Experiment showed that improved anti-burst sampling drilling rig improved significantly accuracy and efficiency.

    2009 01 v.37;No.211 [Abstract][OnlineView][Download 302K]