首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到18条相似文献,搜索用时 78 毫秒
1.
煤尘粒度分布的分形结构研究   总被引:3,自引:0,他引:3  
本文应用分形几何理论,研究了采煤工作面煤尘粒度分布的分形特征,研究发现,煤尘粒度分布具有很好的分形结构,其粒度分布可用分维值定量地描述,研究煤尘的分维值能为选择除尘方法和设备提供科学的理论依据。  相似文献   

2.
为准确预测煤与瓦斯突出灾害,作者以某矿井田为例,采用分形几何学手段研究了井田地质构造的分形特征,并将构造分维数与突出危险性作了对比分析;结果表明,该矿井田地质构造具有分形特征,构造分维数能够定量地描述地质构造的复杂程度,构造分维数与瓦斯涌出量及突出危险性间存在正相关关系.  相似文献   

3.
为准确预测煤与瓦斯突出灾害,作者以某矿井田为例,采用分形几何学手段研究了井田地质构造的分形特征,并将构造分维数与突出危险性作了对比分析;结果表明,该矿井田地质构造具有分形特征,构造分维数能够定量地描述地质构造的复杂程度,构造分维数与瓦斯涌出量及突出危险性间存在正相关关系.  相似文献   

4.
凿岩粉尘粒度分布的分形结构   总被引:1,自引:0,他引:1  
本文应用分形几何理论研究了矿山凿岩对岩粉度分布的分形特征。研究发现岩粉粒度分布具有良好的分形结构。岩粉粒度大小的分布具有良好的分形结构。岩粉粒度大小的分布可用分维值定量地描述。建立岩粉的分维值与凿岩参数的关系很有必要,它能为控制岩粉粒度和凿岩参数优化提供有效的依据。  相似文献   

5.
岩石高边坡岩体结构特征及其工程控制研究   总被引:2,自引:0,他引:2  
以某大型岩石高边坡工程为例,首先采用分形几何方法研究了边坡岩体结构分布的分形特征,总结出了边坡岩体结构分维值与岩体质量评价关系,得出了分维值与岩体波速的经验关系式.根据块体理论确定了边坡工程中的块体系统分布规律及稳定状况,并据此指导了边坡工程安全监测与合理锚固.最后研究了边坡中泥化夹层对边坡稳定性的影响及工程置换增强控制处理方法  相似文献   

6.
本文将分形见何学的原理和方法,应用于东准噶尔喀拉麦里强应变构造带金的矿源层分维特征研究,发现在研究标度范围内金矿具有统计相似性,计算了研究区内不同地层金矿分布的分维值,指出分维值与矿源层中的金品位呈正相关.  相似文献   

7.
褶曲分形特征及其与瓦斯突出关系研究   总被引:1,自引:0,他引:1  
首次提出了煤层褶曲复杂程度的分形度量方法,包括小岛法、剖面线法、轴线法.研究了褶曲剖面线、褶曲轴线分布、褶曲地形的分形特征;证实了褶曲的空间分布特征服从分形规律,为褶曲构造的研究提供了一种新方法.以某井田内的两个采区为例,探讨了褶曲分形特征与瓦斯突出的关系,对预测瓦斯突出提出了一种新思路.  相似文献   

8.
新疆西滩金矿金矿床金品位分维D值及其意义   总被引:3,自引:0,他引:3  
利用分形理论研究了新疆西滩金矿金品位分布的分维结构特征,并对分维D值的地质意义进行了讨论。研究表明,较小的分维值及具有多标度分形,是形成富矿的有利条件。  相似文献   

9.
嘉陵江流域形态及流量过程分维研究   总被引:2,自引:0,他引:2  
本文运用分形有关的基本理论和方法初步探讨了嘉陵江流域形态特征(河长、周长及河网)的分形性和分维值变化.并对控制站的日流量过程的分维进行了计算和对比分析.以利将分形理论和分维值用于水文计算和预报的进一步研究。  相似文献   

10.
岩石爆破破碎机理的分形研究   总被引:3,自引:0,他引:3  
应用分形几何理论,研究了爆炸载荷作用下岩石块度的分布特征,发现在双对数坐标下,爆破块体粒径的质量累积百分数与粒径间呈直线关系,表明其块度分布具有分形结构。根据该直线的斜率b,由公式D=3-b可求得相应的分维。分维可作为描述块度分布特征的一个有序参量,其值反映了爆破块度分布的离散程度和块度的均匀程度。  相似文献   

11.
淮南矿区井田小构造对煤与瓦斯突出的控制作用   总被引:5,自引:1,他引:5  
井田小构造要素是控制煤与瓦斯突出的主要地质因素,它综合影响其他因素,会造成不同破坏程度的煤体结构.对淮南矿区煤与瓦斯突出点构造资料的统计表明,突出点受构造控制的占近64%,而煤、岩巷中的构造控制突出占近72%,突出点由小断层引起煤层产状及煤体结构强烈揉皱的占100%.淮南矿区煤与瓦斯突出点的构造组合形式分断层构造、断层与褶皱叠加和褶皱构造三类,其中断层组合又分地堑型、阶梯型、断层交汇型、挤压构造型和顺层断层型五种.小构造发育是造成煤与瓦斯突出平面分区性和空间分带性的主要原因,构造煤发育程度是造成煤与瓦斯突出发生的直接原因;必须进一步加强小构造对构造煤发育控制范围的研究,提高煤与瓦斯突出预测预报地质构造指标的可靠性.  相似文献   

12.
In this study,differences of signal characteristics between mine shocks and coal and gas outbursts in coal mines were examined with the micro-seismic monitoring technique and time–frequency analysis.The duration of the mine shock is short while the coal and gas outburst lasts longer.The outburst consists of three stages:the pre-shock,secondary shock and main shock stage,respectively.The velocity amplitude of the mine shock is between 10~(-)5and 10~(-3)m/s,which is higher than that of the outburst with the same energy level.In addition,in both cases,the correlation between the velocity amplitude and energy is positive while the correlation between the signal frequency band distribution and energy is negative.The signal frequency band of the high energy mine shock is distributed between 0 and 50 Hz,and the low energy mine shock is between 50 and 100 Hz.The fractal characteristics of mine shocks were studied based on a fractal theory.The box dimensions of high energy mine shocks are lower than the low energy ones,however,the box dimensions of outbursts are higher than that of mine shocks with the same energy level.The higher box dimensions indicate more dangerous dynamic events.  相似文献   

13.
Based on the principle of Bayesian discriminant analysis, we established a model of Bayesian discriminant analysis for predicting coal and gas outbursts. We selected five major indices which affect outbursts, i.e., initial speed of methane diffusion, a consistent coal coefficient, gas pressure, destructive style of coal and mining depth, as discriminating factors of the model. In our model, we divided the type of coal and gas outbursts into four grades regarded as four normal populations. We then obtained the corresponding discriminant functions through training a set of data from engineering examples as learning samples and evaluated their criteria by a back substitution method to verify the optimal properties of the model. Finally, we applied the model to the pre-diction of coal and gas outbursts in the Yunnan Enhong Mine. Our results coincided completely with the actual situation. These results show that a model of Bayesian discriminant analysis has excellent recognition performance, high prediction accuracy and a low error rate and is an effective method to predict coal and gas outbursts.  相似文献   

14.
A large number of spatial and attribute data are involved in coal resource evaluation. Database is a relatively advanced data management technology, but its Major defects are the poor graphic and spatial data functions, from which it is difficult to realize scientific management of evaluation data with spatial characteristics and evaluation result maps. On account of these deficiencies, the evaluation of degree of complexity of mining fault network, based on GIS, is proposed, which integrates management of spatial and attribute data. Fractal is an index which can reflect the comprehensive information of faults' number, density, size, composition and dynamics mechanism. Fractal dimension is used as the quantitative evaluation index. Evaluation software has been developed based on a component GIS-MapX, with which the degree of complexity of fault network is evaluated quantitatively using the quantitative index of fractal dimensions in Liuqiao No.2 coal mine as an example. Results show that it is effective in acquiring model parameters and enhancing the definition of data and evaluation results with the application of GIS technology. The fault network is a system with fractal structure and its complexity can be described reasonably and accurately by fractal dimension, which provides an effective method for coal resource evaluation.  相似文献   

15.
Single-phase low current grounding faults areoften seen in power distribution system of coal mines. These faults are difficult to reliably identify. We propose a new method of single-phase ground fault protection based upon a discernible matrix of the fractal dimension associated with line currents. The method builds on existing selective protection methods. Faulted feeders are distinguished using differences in the zero-sequence transient current fractal dimension. The current signals were first processed through a fast Fourier transform and then the characteristics of a faulted line were identified using a discernible matrix. The method of calculation is illustrated. The results show that the method involves simple calculations, is easy to do and is highly accurate. It is, therefore, suitable for distribution networks having different neutral grounding modes.  相似文献   

16.
以煤体结构为基础的煤与瓦斯突出简化力学模型   总被引:8,自引:0,他引:8  
从能量的角度分析计算了煤与瓦斯突出中作用于煤体的动力和煤体本身的阻力,建立了以煤体结构为基础的煤与瓦斯突出简化力学模型,定量讨论了煤与瓦斯突出的力学过程,并给出了其构造煤临界厚度判据  相似文献   

17.
断层是诱发矿井突水事故的重要影响因素,新汶煤田受奥灰岩溶突水威胁严重,针对断层诱发突水问题,在系统总结新汶煤田矿井断层构造分布特征基础上,建立了断层对奥灰岩溶突水影响定量化分析体系。引入断层影响因子概念,对底板突水危险性进行了定量分析;采用非线性理论对煤矿地质构造发育特征进行定量化研究,揭示了矿井断层分维特征,提出了断层分维特征及其对突水影响危险性分区的原则及方法。采用断层影响因子等值线和断层分维等值线相互融合技术,得到新汶煤田协庄煤矿奥灰岩溶裂隙分布规律。根据不同单元岩溶的富水性,圈定出煤层突水危险区,对煤炭开采防治突水灾害具有指导意义。  相似文献   

18.
Spontaneousoutburstsareanintricatephenomenonofgasdynamicsandoneofthemostseriousdisastersincoalmining.Theoccurrenceofcoalandgasoutburstsisunevelydistributedbothinareaandgeologicalcrosssection.Theresultsofextensivescientificstudiesconductedintheworldshowthattheplacewherecoalandgasoutburstsoccurismainlyinthepeculiarzones.Thesezoneshavesoftbandssufferingfromseriousgeologicaldisturbances.ThedistructionofcoalmasstextureisaprerequisitetocoalandgasoutburstsLlj.Someresearcherspredictandforecastoutburs…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号