煤层瓦斯含量预测方法研究

利用矿井采掘区煤层瓦斯含量实测值，在瓦斯地质定性分析基础上，通过丰富翔实的钻孔资料建立井田未采掘区合用的煤层瓦斯含量预测公式，从而达到对井田煤层瓦斯含量预测的目的。为大型矿井煤层瓦斯含量预测提供了思路和方法。     

阳泉五矿井田瓦斯地质特征及煤层瓦斯含量预测

作者通过阳泉五矿井田瓦期地质特征的分析研究，提出了未开采区煤层瓦斯含量预测公式。     

解吸法测定煤层瓦斯压力和瓦斯含量的实验研究

本文实验研究了煤屑的瓦斯解吸规律，实验表明：煤屑的解吸瓦斯流量与煤层瓦斯含量、瓦斯压力密切相关，利用煤屑解吸瓦斯流量可准确测算煤层瓦斯压力和瓦斯含量，该方法具有测定速度快、简单易行、数据可靠等特点，可在现场推广应用。最后提出了利用煤屑解吸瓦斯流量测算煤层瓦斯压力和瓦斯含量的计算方法和计算公式。     

偏最小二乘法的煤层瓦斯含量预测模型研究

煤层瓦斯含量预测对矿井安全生产至关重要。根据煤层瓦斯含量受多种因素影响,运用偏最小二乘多元线性回归,通过交叉有效性分析,确定提取主成分个数,建立数学模型,得到最佳多元线性回归方程。研究证明:该方法配合SIMCA-P软件处理不仅可以最终以图表形式直观地反映各种因素对煤层瓦斯含量的影响程度,而且能够有效解决各种因素之间存在的严重线性相关问题,预测值比较精确,为煤层瓦斯含量预测提供了一种新途径。     

阳泉五矿井田瓦斯地质特征及煤层瓦斯含量预测

作者通过对阳泉五矿井田瓦斯地质特征的分析研究,提出了未开采区煤层瓦斯含量预测公式.     

张小楼井田煤层有机质特征及瓦斯灾害性认识

通过对张小楼井田煤层煤岩特征、有机显微组分、气体化学成分及热力学等方面的研究。论述了该井深部煤层瓦斯的灾害性。     

基于逐回归分析的瓦斯含量预测研究

为了解各影响因素对煤层瓦斯赋存特征的影响,准确预测煤层瓦斯含量,在潘三矿勘探钻孔资料的基础上,运用线性统计规律和瓦斯地质因素分析方法,确定影响11-2煤层瓦斯含量分布的主要控制因素有煤层埋藏深度、地质构造、砂泥比、煤层厚度和倾角;利用逐回归分析建立煤层瓦斯含量预测模型,并结合实际数据,对预测模型进行检验与误差分析。结果显示,模型预测精确度高,验证了基于逐步回归分析方法的预测模型的可靠性,具有很好的实用价值。     

焦西矿瓦斯地质特征与瓦斯地质模型

运用区域分析方法，对矿井进行瓦斯地质分区分带；划出瓦斯突出区，对掘进巷道运用瓦斯地质综合剖面图，圈定瓦斯突出段。从焦西矿４２０６１顺槽总结了底板隆起薄煤带瓦斯突出地质模型及正断层瓦斯扩散地质模型。这些方法对煤矿生产中瓦斯地质工作具有实用性，对瓦斯地质的模型建立具一定理论意义。     

煤力学特征的对比试验分析及其在煤与瓦斯突出研究中的应用

运用一种新的构造煤采样与加工方法，通过大量的试验测定，对比分析了原生结构煤和构造煤的力学特征；定量讨论了主要力学参数间的相关关系，给出了描述煤体破坏状态的颁上函数式，并且模拟构成煤与瓦斯突出４个主要能量体之间的相互作用，建立了简化力学模型；从理论上证明了构造煤厚度是煤与瓦斯突出的一个启动因素，讨论了计算其临界值的可能性。     

Effect of protective coal seam mining and gas extraction on gas transport in a coal seam

A gas–solid coupling model involving coal seam deformation,gas diffusion and seepage,gas adsorption and desorption was built to study the gas transport rule under the effect of protective coal seam mining.The research results indicate:(1) The depressurization effect changes the stress state of an overlying coal seam and causes its permeability to increase,thus gas in the protected coal seam will be desorbed and transported under the effect of a gas pressure gradient,which will cause a decrease in gas pressure.(2) Gas pressure can be further decreased by setting out gas extraction boreholes in the overlying coal seam,which can effectively reduce the coal and gas outburst risk.The research is of important engineering significance for studying the gas transport rule in protected coal seam and providing important reference for controlling coal and gas outbursts in deep mining in China.     

曹县地区煤层气开发

针对曹县地区的煤层气资源 ,提出了完整的开发设计方案 ,包括外部协作配套条件 ,项目建设资源条件 ,用户市场 ,气井布置 ,地面排水采气设备 ,煤层气的储存与输送以及其他相应配套工程 ,并进行了技术经济分析与评价 ;认为曹县地区煤层气开发项目配套条件可靠 ,投资效益显著 ,对该地区国民经济的发展和环境效益的提高都具有特殊重要的意义 .     

曹县地区煤层气开发

针对曹县地区的煤层气资源,提出了完整的开发设计方案,包括外部协作配套条件,项目建设资源条件,用户市场,气井布置,地面排水采气设备,煤层气的储存与输送以及其他相应配套工程,并进行了技术经济分析与评价;认为曹县地区煤层气开发项目配套条件可靠,投资效益显著,对该地区国民经济的发展和环境效益的提高都具有特殊重要的意义.     

A case study of gas drainage to low permeability coal seam

Gas drainage at low gas permeability coal seam is a main barrier affecting safety and efficient production in coal mines. Therefore, the research and application of drainage technology at low permeability coal seam is a key factor for gas control of coal mine. In order to improve the drainage effect, this paper establishes a three-dimensional solid-gas-liquid coupling numerical model, and the gas drainage amounts of different schemes are examined inside the overburden material around the goaf. The Yangquan mine area is selected for the case study, and the gas movement regularity and emission characteristics are analyzed in detail, as well as the stress and fissure variation regularity. Also examinations are the released gas movement, enrichment range and movement regularity during coal extraction. Moreover, the gas drainage technology and drainage parameters for the current coal seam are studied. After measuring the gas drainage flow in-situ, it is concluded that the technology can achieve notable drainage results, with gas drainage rate increase by 30%–40% in a low permeability coal seam.     

A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory

Coal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane (CBM) exploration as a significant basic parameter. Due to the calculation error of lost gas and residual gas in the direct method, the efficiency and accuracy of the current methods are not inadequate to the large area multi-point measurement of coal seam gas content. This paper firstly deduces a simplified theoretical dynamic model for calculating lost gas based on gas dynamic diffusion theory. Secondly, the effects of various factors on gas dynamic diffusion from coal particle are experimentally studied. And sampling procedure of representative coal particle is improved. Thirdly, a new estimation method of residual gas content based on excess adsorption and competitive adsorption theory is proposed. The results showed that the maximum error of calculating the losing gas content by using the new simplified model is only 4%. Considering the influence of particle size on gas diffusion law, the particle size of the collected coal sample is below 0.25 mm, which improves the measurement speed and reflects the safety representativeness of the sample. The determination time of gas content reduced from 36 to 3 h/piece. Moreover, the absolute error is 0.15–0.50 m³/t, and the relative error is within 5%. A new engineering method for determining the coal seam gas content is developed according to the above research.     

Study on primal CO gas generation and emission of coal seam

The main method of casting coal spontaneous combustion is prediction of index gases, with carbon monoxide(CO) commonly used as an index gas. However, coal spontaneous combustion is not the sole source of CO evolution; primal CO is generated through coalification, which can lead to forecasting mistakes. Through theoretical analysis, primal CO generation and emission from coal seams was determined.In this study, six coal samples were analyzed under six different experimental conditions. The results demonstrated the change in coal seam primal gas and concentration as functions of time, different coal samples, occurrence, various gas types and composition concentration, which are in agreement with the previous study on primal CO generation. Air charging impacts on primal gas emission. Analysis of the experimental data with SPSS demonstrates that the relationship between primal CO concentration and time shows a power exponent distribution.     

煤层注水防突最优润湿时间试验研究

煤层注水就是通过钻孔将压力水注入煤体,使煤、瓦斯和水之间产生复杂的三相耦合作用,以降低煤炭开采时煤尘生成量并防止煤与瓦斯突出.煤矿采用煤层注水防突措施后,何时进行采掘作业,长期以来缺少可靠的判断方法.针对此问题,在实验室通过测定煤层注水后不同润湿时间下预先吸附瓦斯煤样的解吸速度,根据煤、水充分润湿后水与煤体中孔隙的毛细作用和抑制瓦斯解吸效应最强原理,以第一分钟瓦斯解吸速度V1及解吸速度衰减系数k t作为研究指标,在特定试验条件下,计算得到超化、古汉山和寺河等煤矿煤样的最优润湿时间,分别为6.44,7.00,10.41 h.最后,结合各煤样的注水相关参数,论证证明最优润湿时间确定方法是可行的,该方法对煤层注水防突技术参数优化具有重要的指导意义.     

煤层瓦斯产出流态判识方法研究

针对目前评价瓦斯运移产出难易程度的方法均依据线性渗流理论,评价结果严重失真的问题,提出以雷诺理论为基础,通过实验室煤样地质强度因子(Geological Strength Index,GSI)的观测、启动压力梯度(λ)和渗透率测试方法,且初步建立了启动压力梯度法和GSI法用于判识瓦斯运移产出流态。指出当λ=0 Pa·m-1时为线性渗流;当λ≠0 Pa·m-1,瓦斯压力梯度大于λ时为低速非线性渗流,小于λ时为扩散。同时,以渗透率为桥梁建立了GSI与雷诺数的关系,通过煤心观测、煤壁观测和测井资料解释等途径获取GSI,即可判识煤的瓦斯流态。     

Characteristics of transmitting channel wave in a coal seam

An embedded underground coal seam carries channel waves of low seismic velocity along a stratigraphic rock-coal-rock sequence. In a homogeneous and isotropic seam, seismic waves propagate as trapped waves within the seam, which leads to propagation of channel waves. We describe how to set up a field test for transmission in order to acquire channel waves in a coal seam. Because channel wave signals are non-stationary in their frequencies and amplitudes, a necessary velocity spectrum and wavelet transformation analysis are applied to interpret the characteristics of channel waves. The advantage of using a wavelet transformation is that different resolutions can be obtained at different times and different frequencies. According to analysis of the seismic signals acquired in the S7 sensor hole, it was clearly shown that the characteristics of channel waves are lower frequencies and attenuation which can guide an effective wave for detecting voids, boundaries and faults in coal seams with strong roofs and floors.