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。     

永定矿区瓦窑坪矿瓦斯地质图编制及应用

本文介绍了瓦窑坪矿的矿井地质概况，探讨了该矿低瓦斯形成的原因，论述了瓦斯地质编图在矿井瓦斯管理及指导安全生产中的应用。     

孔庄煤矿瓦斯地质规律研究

分析了矿井瓦斯涌出特征，研究了矿井瓦斯地质规律，并采用瓦斯地质数学模型法对深部未采区域进行了瓦斯涌出量预测。     

焦作矿区古汉山新建矿井瓦斯涌出量预测

本文运用瓦斯地质类比法预测新建矿井的瓦斯涌出量，为设计部门提供了可靠的瓦斯参数，其论点新颖，方法简便，预测精度高。     

瓦斯地质在隧道突出危险性评价中的应用

本文运用瓦斯地质理论和方法对沁水煤田南部区域进行了系统调查分析，对区内煤层瓦斯含量、瓦斯压力、瓦斯放散速度△Ｐ、煤的坚固性系数ｆ及突出预测指标Ｋ、Ｄ值等做了测定和计算，依此为基础，应用瓦斯地质类比法对云台山隧道揭煤瓦斯突出危险性做了综合评价。     

突出采区实行分区分级管理的尝试

本文应用瓦斯地质的观点，对几个突出采区及采掘工作面进行了瓦斯地质分析和突出危险性预测，实行了煤与瓦斯突出的分区分级管理。     

应用瓦斯地质图指导安全生产

本文介绍了半罗山矿的地质概况，探讨了低瓦斯矿井瓦斯涌出的一般规律，论述了瓦斯地质编图对煤矿通风安全及生产的指导意义。     

利用瓦斯地质理论判定右江局里拉矿瓦斯性质及等级

本文应用瓦斯地质理论在里拉矿研究了瓦斯来源，评价了瓦斯等级。其结果表明，里拉矿的瓦斯系煤成气，瓦斯含量不大，没有必要建立瓦斯抽放系统。     

兖州煤田地质构造对瓦斯的控制作用

分析了兖州煤田煤层甲烷赋存特征及地质构造对煤层瓦斯的控制作用，提出应用瓦斯地质理论，加强瓦斯的预测和防治。     

应用瓦斯地质单元法划分突出危险区域

受地质条件控制,煤与瓦斯突出的发生地点呈区域性分布,瓦斯突出区域性预测要以瓦斯地质为基础.在长虹公司地质勘探时期的瓦斯地质资料统计,以及二1煤层瓦斯基础参数测定成果的基础上,运用瓦斯地质学的研究方法总结了长虹井田二1煤层瓦斯的赋存特征和瓦斯地质规律.从瓦斯地质角度对长虹公司二1煤层煤与瓦斯的突出现象进行了分析,确定了长虹公司二1煤层煤与瓦斯突出区域预测指标及其临界值,进而将井田划为3个相互独立的瓦斯地质单元;根据瓦斯地质单元法划分突出危险区域的方法,最后对该矿的突出危险区域与非突出危险区域进行了划分.     

Evaluation and intelligent deployment of coal and coalbed methane coupling coordinated exploitation based on Bayesian network and cuckoo search

Coal and coalbed methane (CBM) coordinated exploitation is a key technology for the safe exploitation of both resources. However, existing studies lack the quantification and evaluation of the degree of coordination between coal mining and coalbed methane extraction. In this study, the concept of coal and coalbed methane coupling coordinated exploitation was proposed, and the corresponding evaluation model was established using the Bayesian principle. On this basis, the objective function of coal and coalbed methane coordinated exploitation deployment was established, and the optimal deployment was determined through a cuckoo search. The results show that clarifying the coupling coordinated level of coal and coalbed methane resource exploitation in coal mines is conducive to adjusting the deployment plan in advance. The case study results show that the evaluation and intelligent deployment method proposed in this paper can effectively evaluate the coupling coordinated level of coal and coalbed methane resource exploitation and intelligently optimize the deployment of coal mine operations. The optimization results demonstrate that the safe and efficient exploitation of coal and CBM resources is promoted, and coal mining and coalbed methane extraction processes show greater cooperation. The observations and findings of this study provide a critical reference for coal mine resource exploitation in the future.     

基于数字信号处理器的激光光谱瓦斯监测系统

利用可调谐二极管激光吸收光谱(TDLAS)技术,选择不受干扰的1653.72nm波长处的吸收线监测煤矿瓦斯浓度,并结合了高性能的数字信号处理器(DSP)和二次谐波检测技术,进一步降低了检测限,使检测限低于0.074mg/m3,实现了对瓦斯浓度高稳定性和高灵敏度的实时测量。     

Phenomenon of methane driven caused by hydraulic fracturing in methane-bearing coal seams

The methane concentration of the return current will always be enhanced to a certain degree when hydraulic fracturing with bedding drilling is implemented to a gassy coal seam in an underground coal mine. The methane in coal seam is driven out by hydraulic fracturing. Thus, the phenomenon is named as methane driven effect of hydraulic fracturing. After deep-hole hydraulic fracturing at the tunneling face of the gassy coal seam, the coal methane content exhibits a ‘‘low-high-low" distribution along excavation direction in the following advancing process, verifying the existence of methane driven caused by hydraulic fracturing in methane-bearing coal seam. Hydraulic fracturing causes the change of pore-water and methane pressure in surrounding coal. The uneven distribution of the pore pressure forms a pore pressure gradient. The free methane migrates from the position of high pore(methane) pressure to the position of low pore(methane) pressure. The methane pressure gradient is the fundamental driving force for methane-driven coal seam hydraulic fracturing. The uneven hydraulic crack propagation and the effect of time(as some processes need time to complete and are not completed instantaneously) will result in uneven methane driven. Therefore, an even hydraulic fracturing technique should be used to avoid the negative effects of methane driven; on the other hand, by taking fully advantage of methane driven, two technologies are presented.     

Research on fault mode and diagnosis of methane sensor

To improve the reliability of coal mine safety monitoring systems we have analyzed the characteristics of a methane sensor, an important component of the monitoring system of production safety in a coal mine and studied the main type and mode of faults when the sensor was used on-line. We introduced a new method based on artificial neural network to detect faults of me-thane sensors. In addition, using the output information of a single methane sensor, we established a sensor output model of a dy-namic non-linear neural network for on-line fault detection. Finally, the fault of the heating wire of the sensor was simulated, indi-cating that, when the methane sensor had a fault, the predicted output of the neural network clearly deviated from the actual output,exceeding the pre-set threshold and showing that a fault had occurred in the methane sensor. The result shows that the model has good convergence and stability, and is quite capable of meeting the requirements for on-line fault detection of methane sensors.     

差分红外型甲烷浓度光纤网络传感系统的研究

基于甲烷气体在其特征吸收波长下光的吸收程度随浓度变化的机理和差分吸收测量方法,结合空分复用技术和长光程吸收池技术,并考虑煤矿矿井中环境的特点,复用多个气体吸收型光纤传感器.介绍了利用差分红外光谱方法测量矿井中甲烷浓度的光纤网络传感系统的工作原理,给出了系统的结构框图.实验表明,吸收气室光程长为20 cm时,该传感器的检测限为4.278 mg/m3,精确度和稳定性可以满足实际要求,可在不同场合进行多点在线测量.     

石门沟煤矿3号煤层瓦斯赋存规律探究

煤层瓦斯质量体积（含量）是煤层瓦斯主要参数之一,是矿井进行瓦斯涌出量预测、煤与瓦斯突出预测和瓦斯抽放设计的重要依据.只有摸清矿井瓦斯赋存规律,才能对采掘面瓦斯抽放制定合理的技术措施.为避免石门沟煤矿瓦斯治理的盲目性,笔者通过分析煤层瓦斯质量体积与埋藏深度的关系,并结合矿井地质构造,研究了煤层瓦斯赋存规律,总结得出石门沟煤矿3号煤层瓦斯质量体积受地质构造控制,在远离地质构造区域,瓦斯质量体积与埋藏深度呈正相关,并推出其关系式,为矿井瓦斯治理提供可靠数据.     

石门沟煤矿3号煤层瓦斯赋存规律探究

煤层瓦斯质量体积(含量)是煤层瓦斯主要参数之一,是矿井进行瓦斯涌出量预测、煤与瓦斯突出预测和瓦斯抽放设计的重要依据.只有摸清矿井瓦斯赋存规律,才能对采掘面瓦斯抽放制定合理的技术措施.为避免石门沟煤矿瓦斯治理的盲目性,笔者通过分析煤层瓦斯质量体积与埋藏深度的关系,并结合矿井地质构造,研究了煤层瓦斯赋存规律,总结得出石门沟煤矿3号煤层瓦斯质量体积受地质构造控制,在远离地质构造区域,瓦斯质量体积与埋藏深度呈正相关,并推出其关系式,为矿井瓦斯治理提供可靠数据.     

煤层注水促抽瓦斯及其影响因素的数值模拟

为有效预防煤矿瓦斯灾害,获取煤层注水促抽瓦斯的合理参数,以常村煤矿2103工作面为例,依据多相渗流理论,采用Fluent软件的VOF模型及多孔介质模型耦合求解,对煤层注水促抽瓦斯技术及其影响因素进行数值模拟,并将模拟结果应用于现场,对比分析数值模拟与现场实测数据,二者基本吻合.研究结果表明:煤层瓦斯含量以注水孔为中心径向逐步降低,以抽采孔为中心径向逐步升高;注水前抽采阶段,随着抽采时间的增加,抽采范围逐渐增大,抽采孔瓦斯流量先快速下降,后逐步缓慢降低;注水促抽阶段,随着注水时间的增加,注水范围逐渐增大,注水流量逐步降低,煤层瓦斯含量缓慢升高,抽采孔瓦斯流量逐渐增加;注水后抽采阶段,随着抽采时间的增加,压力水覆盖范围持续增大,煤层瓦斯含量逐渐降低,抽采孔瓦斯流量逐渐减小.注水时机、注水时间、注水压力、注水方式、布置方式及钻孔间距是影响煤层注水促抽瓦斯效果的6个主要因素.瓦斯正常抽采20 d后,按照一注一抽方式及5 m间距布置注抽钻孔,在8 MPa煤层注水压力下间歇注水10 d,煤层注水促抽瓦斯效果较好.     

平顶山矿区煤层气赋存特征及开发潜力

平顶山矿区二1煤层富含煤层甲烷气体,其资源量估算达302亿m3以上．本文通过对控制煤层气赋存的二1煤层的传层几何形态、地质特征、煤质变化、特别是物性特征的研究,指出本区二1煤层渗透性较好,渗透率随着围限压力增加而降低,且与判及发育程度、构造应力变化有密切关系．而二1煤层中的煤层气含量与煤层理深有着密切关系,随着深度增加而增加．通过综合分析指出了开发潜力较好的区块．     

Application of gas wettability alteration to improve methane drainage performance: A case study

Hydraulic fracturing technique is widely used for methane drainage and has achieved good effects in numerous coal mines, but negative effects may occur as the fracturing fluids are absorbed into the coal seam. Gas wettability alteration(GWA) technology can be used as it can enhance the gas and water mobility during dewatering process as a result of capillary pressure change. However, there have been few reported field tests in coal mines using GWA technology. This paper describes a pilot-scale field test in Xinjing coal mine, Yangquan, China. The fluorocarbon surfactants perfluorooctyl methacrylate monomer-containing polymethacrylate(PMP) was used to alter the wettability of coal seam to strong gas-wetness during the hydraulic fracturing process. The study focuses on the comparison of two boreholes(Boreholes #9 and #10) and one other borehole(Borehole #8) with and without using GWA approach. A well-defined monitoring program was established by measuring the dewatering volume of the fracturing fluid and the drainage volume of methane as well as the concentration. The field test results showed that the average methane drainage rates of Boreholes #9(39.28 m~3/d) and #10(51.04 m3/d) with GWA treatment exceeded that of Borehole #8(21.09 m~3/d) without GWA treatment,with an increase of 86.3% and 142.1%, respectively. The average methane concentrations of Boreholes #9(4.05%) and #10(6.18%) were 64.6% and 151.2% higher than that of Borehole #8(2.46%), respectively. On the other hand, the dewatering ratio of Boreholes #9(4.36%) and #10(3.11%) was almost 19 times and 13 times greater than that of Borehole #8(0.22%). These field test results were in agreement with the experimental data. The significant increase in both methane concentration and dewatering ratio demonstrated that GWA technology could be applied for enhanced methane drainage in coal mines. Important lessons learned at Xinjing coal mine might be applied to other coal mines in China and elsewhere.