- WANG Hua,ZHENG Yun tao (China University of Geosciences,Wuhan 430074,China) YANG Hong (Xibei Petroleum Geology Office,Wulumuq 830011,China)
Based on the analysis of the abundant sedimentary indicators of the thick coalbeds in three coal forming faulted basins on the Massif Central of France,the distinct accumulation pattern of thick coalbeds and sedimentary conditions are discussed.A new formation mechanism for the intramontagneous thick lacustre coal (peat) accumulation model is demonstrated.The subaquatic gravitary current transported the organic (peat) and inorganic clasts formed in lakeshore swamp were formed in active clastic environment,and were associated with various gravity influenced mudstone and sandstone interlayers.The new thick coalbeds accamalation model can provide reasonable interpretation to genesis of the intramontagneous thick coal beds.
2001 01 [Abstract][OnlineView][Download 278K] - FAN Shi yan,TANG Zhen qing (Exploration Institute of Shandong Coal Geology Bureau,Taian 271000,China)
On the basis of the introduction of the location,condition of strata,and the development of the coal bearing strata of Achibo Sombo area of Yayu coal field in Ethiopia,the distributing regularities,thickness,physical and chemical characteristics,of the oil shale in this area have been of industrial utilization studied.And the reserves of the oil shale has been calculated.Finally,the ways of industrial utilization have been put forward in this paper.
2001 01 [Abstract][OnlineView][Download 289K] - CAO Dai yong,MU Xuan she (China University of Mining and Technology,Beijing 100083,China) WU Qin hai,GUO Zeng chang,LI Zhen sheng,ZHANG Jian jun (Hebei Coal Geology Bureau,Xingtai 054000,China)
Based on mathematical statistics of the data concerning fault structures,the correlation between fault elements and mechanical properties of faults are analyzed.The empirical formulas for relation between drop height and strike length of different types of faults are established,and the distribution regularity of faults in mine area is shown.This paper emphasizes on the significance of slightly dipping reverse faults in the structure framework in Yuxian Mine Area.
2001 01 [Abstract][OnlineView][Download 162K] - DAI Shi feng,AI Tian jie,JIAO Fang li,HOU Hui min,MAO He ling (China University of Mining and Technology,Beijing 100083,China) MA Feng xue,LI Bao chun,XIN Ze shi (Inner Mongolia Wuda Coal Mining Administration,Wuhai 016040,China)
The coal washability is controlled by coal accumulating area.The research on relationship between characteristics of pyrite and clay mineral distribution and the coal genesis types of main minable coal seams No.9, No.10, No.12, No.13,and No.15,in the Wuda mining area,Inner Mongolia,indicated that the coal seams formed in a fluvial dominated delta plain are characterized by low pyrite content,high clay mineral content and better washability,but the coal seams formed in tide dominated delta plain are characterized by high sulfur,low clay mineral content and the mid degree of washability.In addition,the washability of pyrite and clay mineral of the coal seam formed in tidal flat is the worst.
2001 01 [Abstract][OnlineView][Download 123K] - LI Chao feng 1,SHI Ming ying 2,WANG Gui liang 1 (1.College of Mineral Resource and Environment Sciences,CUMT,Xuzhou 221008,China; 2.Zhengzhou Institute of coal Geology,Zhengzhou 450000, China)
A new method of illumination and dynamic display of 3D model is introduced.The triangular network and surface spline interpolation algorithms are proposed.It is discussed that the visibility test,the calculation method appropriate to 3D model.The dynamic display of model and auto drawing of profile are successfully realized.
2001 01 [Abstract][OnlineView][Download 388K]
2001 01 [Abstract][OnlineView][Download 168K] -
2001 01 [Abstract][OnlineView][Download 168K] - TONG Hong shu 1,WU Su zhen 2 (1.Renlou Coal Mine,Northern Anhui Administration,Suzhou 234001,China; 2.Technique Department,Northern Anhui Administration,Suzhou 234001,China)
The orientation and amplitude of thinning and thickening zones of main mining coal seams in some mining areas of Qianling coal mine are studied,through observation and research on the features and distribution regularities of slip sheet structures.The results indicated the development situation of soft beds and slip sheet structures in coal seams No.3 1-5 and the thinning or thickening regularities in the coal seam No.4,which provided geological information.
2001 01 [Abstract][OnlineView][Download 413K] - LI Shu gang 1,QIAN Ming gao 2,SHI Ping wu 1 (1.Xi′an University of Science Technology,Shaanxi Xi′an 710054,China; 2.China University of Mining and Technology,Jiangsu Xuzhou 221008,China)
With the Electro hydraulic Servocontrolled Rock Mechanics Testing System,the permeability of soft coal sample related to complete stress strain path is experimented with instantaneous permeating method of data auto control.An annular strain sensor is set up firstly in testing,and the curves,reflecting the relationship between permeability of coal sample and principal stress difference,axial strain and volumetric strain,as well as the relevant equations are established.Thus it can be seen the coal sample permeability coefficient is twofold function of volumetric strain.It is binomial equation when the sample volume decreased,and five polynomial one when the volume increased.The equation can be applied to the numerical analysis of the coupled stress field and the fluid flow field,and the calculated results agree well with those observed.
2001 01 [Abstract][OnlineView][Download 139K] - XIA Yu cheng (Geology Department,Xi′an University of Science and Technology,Xi′an,710054,China)
The automation technique of quantitative prediction of mine structure,such as automatic dissection of assessment units,access of information,digitizing of assessment indexes,are introduced to easily use the method of quantitative prediction of mine structure in more coal mines
2001 01 [Abstract][OnlineView][Download 332K] - GUO Bin wu(The3 rd Mine of Yaojie Mining Administration,Gansu,Lanzhou,730080,China)
Based on experiences of geological work in the 3 rd Mine of Yaojie Mining Administration,the characteristics of structural coal in the mine are analyzed.The relationships between coal characteristics and mechanics of carbon dioxide outburst.The results show that the most important control factors include geological structures,coal texture and coal thickness variations.The forecast for outburst potential areas can be conducted according to distribution regularities and thickness variations of structural coal.
2001 01 [Abstract][OnlineView][Download 292K] - WANG Wen xiang YANG Wu yang TANG Fang tou(Xi′an Branch,CCRI,Xi′an 710054,China)
The maps of stress measurements for two physically different target seams in front and after fracturing are presented.The maps show differences of extending ways and influence scopes of artificial fractures in two different seams.This method provides some useful geological information for well design in coalbed methane (oil,gas)development.
2001 01 [Abstract][OnlineView][Download 254K] - DU Wen tang(Hebei Institute of Architectural Science and Technology,Handan 056038,China)
In order to design the width of barrier pillar reasonably,the “JC” method for reliability is used.Limit state equations for reliability of barrier pillar are given after analzing randomness of hydraulic pressure,tensile strength of coal bed and coeffcient of water inrush.This paper calculates reliability index,lose efficacy probability and safety coefficient corresponding to the width of different barrier pillar.In contrast with other accidents,the lose efficacy probability of the barrier pillar ranges suitably in 1×10 -5 ～1×10 -6
2001 01 [Abstract][OnlineView][Download 256K] - NIU Jian guo(No.185 Team,Shaanxi Bureau of Coal Geology,Yulin 719000,China)
The coal seam roof of Huojitu Mine is the burnt rock,which is the water impregnated aquifer,is dangerous to mine safety.The burnt rock distributed widely.The regularities of fracture development are vertically apparant,for example,the fractrues decrease upwards.The water abundance of the rock is controlled not only by structures,geographic and surface features,but also controlled by the recharge condition from other aquifer.The water quality of the rock can meet the drinking water standards of the state.Therefore,the water control combining dewatering and water supply is the effective way.
2001 01 [Abstract][OnlineView][Download 140K] - JIA Xi rong,LI Lin tao,NING Jian hong,GU Guang ming,LI Yun chao (Xi′an Branch,CCRI,Xi′an 710054,China)
Coal is one of the unregenerate natural resources.The many environmental problems caused by the coal extraction have not be coordinated with the sustainable development of the national economy,and have become the comprehensive restrictive factor against the our society,economy,and regional ecological environment development.For reason given above,it is necessary to realize and analyze the restriction or relation among the essential environmental factors,to take the systematical and the sustained environmental protection measures,and to make the coal mine area′s environment continued improvement from the point of view of the coal mine area′s sustainable development.
2001 01 [Abstract][OnlineView][Download 164K] - FU Pei he,FU Pei yu,GAO Qing tao (Qiwu Coal mine,Shandong,Weishan 277606,China)
The calculation method of mining subsidence is used to determine the mining influence scope to investigate the relationship between room crevice phenomenon and subsurface mining in Qiwu mining district.Based on comprehensive comparison and analysis of geologic conditions and mining method,reasonable calculation parameters are determined,the final boundary of mining influence is detemined with adjustment for calculated boundary and the boundary determined with other method.The result confirmed that there is no relationship between room crevice and subsurface mining.The analysis indicated that the room crevice is caused by regional structure movement,engineering geology and building quality.
2001 01 [Abstract][OnlineView][Download 129K] - ZHOU Cheng gang,GAO Jun liang (Hydrogeology and Engineering Geology Surveying Institute, China National Administration of Coal Geology,Handan 056004,China)
Grouting soil stirring for foundation improvement is one of techniques of foundation treatment.The intensity of consolidated mixture of cement and soil is controlled by water content,the volume of blended cement and the kinds of subsoil.The laboratory and in situ experiment results show that the water content influences the intensity of grouting soil negatively;the relationship between intensity of grouting soil and the volume of blended cement is not simple positive correlation,and the influence of soil kinds is relatively larger.The intensity of sludge and mud is lower,because of their large content of organic matter,but the intensity of grouting soil formed by silt and clay is larger.
2001 01 [Abstract][OnlineView][Download 148K] - ZHOU Ya tong 1,DONG En qing 1,HE Zhen hua 2 [WT5,5”BZ](1 Xi′an Jiaotong University,Xi′an 710049,China;2 Chengdu University of Technology,Chengdu 610059,China)
Based on the seismic positioning principle we can do 3D prestack forward modeling by one way acoustic wave equation in complex geological conditions.This method has very high caculating efficiency and hasn't multi reflections in the seismic records.But unsuitable velocity in model usually result in frequency and wave number's lossing of wave field that cause wave field's aberration and reduce quality of seismic forward records.This paper proposes wave field replacement technology which uses new wave field formed by zero phase wavelet to replace old aberrant wave field and keep old one's dynamical and spacial characteristic at the same time.It is very suitable to use this technology in 3D prestack forward modeling because the wave field of focus and receiver's response are similar in shape and every trace's amplitude envelope in wave field only has one extreme value.The simulation shows that the record's quality is improved when using wave field replacement technology.
2001 01 [Abstract][OnlineView][Download 218K] - HAN De pin,SHI ya ding,LIU Qing wen (Xi′an Branch,CCRI,Xi′an 710054,China)
From researching the electrical penetration field theory between two roads of panel and it's one dimension numerical modeling,it is indicated that six electrical penetration techniques have obvious reflection to the change of electrical characters in roof and floor of the panel,but less reflection to the coal seam itself.The research provides the theory basis for detecting water bearing and water conductive structures in the roof or floor of panels.
2001 01 [Abstract][OnlineView][Download 243K] - LI Shi,LI Chuang she,ZHANG Yan peng,ZHANG Peng fei,SONG Jian ping (Xi′an Jiaotong University,Xi′an,710049,China)
Transient Electromagnetic Method(TEM) is a kind of promising measure method in the shallow geophysical soundings.As an important detecting tool,there are many key technology to be solved,So TEM soundings is limited in the shallow geologic structure exploration.In this paper,the key technology of hardware and software design in TEM.A new program controlled antenna and early signal detecting are put forward.
2001 01 [Abstract][OnlineView][Download 329K] -
2001 01 [Abstract][OnlineView][Download 129K] - YAO Ai guo,YAN Tai ning,GONG Yuan ming,Wu xiang (Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
This paper proposes an optimum drilling method with the help of the drilling field database.The database collects the drilling parameters from a drilling computer monitor system in real time and gathers the information of encountered formations,drilling cost and other drilling relevant data by manual input.Because of the connection of drilling parameters with the data of the formation and drilling cost,the goal of optimum drilling especially minimum cost drilling can be easily achieved.
2001 01 [Abstract][OnlineView][Download 268K] - TENG Zi jun (Shandong Bureau of Coal Geology,Taian 271000,China)
Our bureau exploited the intelligentizing managing system of hole technical information which can store,inquire,gather,print,analyze,optimize data.This paper introduces the methods of design and realization.
2001 01 [Abstract][OnlineView][Download 205K]
2001 01 [Abstract][OnlineView][Download 118K]