In the Huainan mining area, the floor limestone water of coal group A is the main potential safety hazard threatening coal pro duction. Thus, to prove up and drain floor limestone water with accuracy has guiding significance to coal safe working in the area.Through mining area previous geological exploration data analysis, on the basis of the typical Panji No.2 coalmine section linking bore holes V east 02 and C3-Ⅲ modeled a three-layered numerical model to simulate floor aquiferous abnormal bodies in the area. Under the condition of device type and line polar moment changes, using two electrical parameters of resistivity and polarizability carried out numerical simulation study. The result has shown that when depth of abnormal body relatively deep or number of electrode is limited,tri-electrode arrangement is preferred. Using small electrode spacing can improve vertical resolution effectively. Responsibility of po larizability on abnormal body is weaker than resistivity. Moreover, to improve research level, indoor project site model established and carried out experiment with the Wenner tri-electrode arrangement, the result has shown that relation between the sizes of apparent re sistivity and polarizability and water yield is rather obvious, the method is an aid to the assessment of floor limestone water.

Aiming at the evolution of resistivity and permeability during loading process in rock failure,it is shown that there is a close relationship between resistivity and permeability under saturated state.The mathematical expression of resistivity and permeability based on equations of Archie and Carman-Kozeny was obtained.The micro-mechanism evolution of resistivity and permeability can be described as follows: the expanding and interaction of micro-cracks lead change.The application of the related model is also discussed.

Through the establishment of the model for groundwater seepage-electric test,mine roof water-inrush was simulated and coarse-grained sand,medium-grained sand and fine-grained sand were partly used as aquifer media.The properties of transient response of parameters of the geoelectric field are real time monitored by network parallel electrical equipment.Through analyzing the variation curves of spontaneous potential,exciting voltage and exciting current with time and the pictures of apparent resistivity with time,the authors have found that the experiments on three different kinds of aquifer media show apparent response and basically have the same regularity.In the process of water-inrush,the spontaneous potential of coarse sand and medium sand are significantly lower than that of the two stages before and after water-inrush.The spontaneous potential of fine sand keeps growing and shows significant changes in the water-inrush point.And the exciting voltage and exciting current keep the same changes.Compared with the stages before and after water-inrush,the exciting voltage shows great reduction and the exciting current shows dramatic rise.The apparent resistivity section diagram can clearly show the change process at seepage,water-inrush and post-water-inrush stages,which can be applied to judge the water capacity of aquifer.The study is of practical significance for the study of mine flood forecast and prevention.

Multi-scale wavelet analysis theory is applied to study water inflow in mine face,spontaneous potential and water level of directly water-charged aquifer.It is found that there exists close relationship among these three types of data by wavelet decomposition and reconstruction.The regularity in the 2nd signal of the low-frequency reconstructing is that spontaneous potential rises due to water level fall,causing increased water inflow when the water level rebounds and spontaneous potential reduces as well as the corresponding water inflow reduces.The regularity in the 2nd reconstructed signal of low frequency is that high water level and low spontaneous potential are corresponding with small water inflow,low water level and high spontaneous potential are corresponding with large water inflow.

煤炭是我国的支柱能源及重要的化工原料,时社会经济发展贡献非常突出,通过对近几年来中国煤炭资源的发展状况分析,本文阐述了中国煤炭资源的现状,分析了中国煤炭资源存在的问题,指出了中国煤炭资源面临的危机,提出了中国煤炭资源的战略选择.