低瓦斯煤层工作面瓦斯涌出量预测与防治

利用瓦斯地质数学模型法建立了工作面瓦斯涌出量数学模型,预测了未采区工作面瓦斯涌出量.瓦斯涌出量等值线大体上沿北东方向展布,并具有随煤层埋深增加而增大的总体趋势.依据工作面瓦斯涌出量构成及瓦斯涌出量预测结果,提出了工作面瓦斯治理的两套措施,即采空区瓦斯抽放和下行风加专用排瓦斯巷.     

非线性矿井瓦斯涌出量预测及基于.NET的开发应用

分析了地质因素和工程因素对矿井瓦斯涌出量的影响,提出了瓦斯涌出量非线性回归预测方法.根据矿井实际情况确定了需要分析的影响因素,通过STATISTICA统计软件中Nonlinear Estimation和FixedNonlinear regression模块建立和检验了瓦斯涌出量非线性回归数学模型,得出非线性回归数学模型瓦斯涌出量与主要影响因素具有较高的相关性.应用.NET提供的可视化界面及C#程序语言开发了瓦斯涌出量非线性预测软件,通过对成庄矿3390采面预测效果验证,表明非线性回归预测方法对矿井瓦斯涌出量预测是可行的.     

基于BP神经网络分源预测综采面瓦斯涌出量研究

为了提高综采工作面瓦斯涌出量的预测精度,根据综采工作面瓦斯来源的分析,在瓦斯分源预测方法的基础上,融合神经网络预测技术,建立BP神经网络分源预测模型。结合某矿1242（1）工作面地质条件和开采技术条件,利用BP神经网络分源预测模型对工作面瓦斯涌出量进行了预测,结果表明,BP神经网络分源预测模型预测精度能满足现场需求,与分源法相比较,在综采工作面瓦斯涌出量预测中方便简洁而且具有很高可信度,其应用前景更广泛。     

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。     

基于GA-LSSVR算法的回采工作面瓦斯涌出量预测

针对回采工作面瓦斯涌出量问题的小样本、非线性、影响因素关系复杂等特点,采用遗传-最小二乘支持向量回归算法对瓦斯涌出量进行预测,利用定量方法进行分析,避免了定性分析的局限性,有效提高了预测的精度。该模型首先利用遗传算法对最小二乘支持向量回归机中的参数进行训练和优化,然后运用遗传-最小二乘支持向量回归模型对测试样本进行了回采工作面瓦斯涌出量测试。测试结果表明:与支持向量回归机以及最小二乘支持向量回归机的预测值相比,遗传-最小二乘支持向量回归的回采工作面瓦斯涌出量预测可靠性和精确性更高。     

阳泉三矿大采长综放工作面瓦斯涌出特征分析

大采长综放工作面单位时间内瓦斯涌出量增大,经常造成工作面回风隅角和回风巷瓦斯质量浓度超限.通过分析综放工作面瓦斯涌出源,可以了解其瓦斯涌出特征.对阳泉三矿大采长K8206综放工作面初采期和回采期的瓦斯涌出规律的分析可知,初采期瓦斯涌出量具有大幅度波动性,其原因主要为采空区瓦斯不断地、周期性地涌入.正常回采期,只要高抽巷的抽放负压足够大,邻近层瓦斯涌入工作面的问题就能解决;而大采长综放工作面本煤层瓦斯涌出量增大,则需要增加通风量或者采用新的通风方式.     

阳泉三矿大采长综放工作面瓦斯涌出特征分析

大采长综放工作面单位时间内瓦斯涌出量增大,经常造成工作面回风隅角和回风巷瓦斯质量浓度超限.通过分析综放工作面瓦斯涌出源,可以了解其瓦斯涌出特征.对阳泉三矿大采长K8206综放工作面初采期和回采期的瓦斯涌出规律的分析可知,初采期瓦斯涌出量具有大幅度波动性,其原因主要为采空区瓦斯不断地、周期性地涌入.正常回采期,只要高抽巷的抽放负压足够大,邻近层瓦斯涌入工作面的问题就能解决;而大采长综放工作面本煤层瓦斯涌出量增大,则需要增加通风量或者采用新的通风方式.     

高产高效工作面煤壁及落煤瓦斯涌出特征及应用

本文用现场实测与实验室实验相结合的方法次此对日产万吨的高产高效工作面的煤壁及落煤瓦斯涌出特征进行了较为全面的研究，给出了符合实际的瓦斯涌出经验公式，并应用这些成果对煤壁、落煤及开采层的瓦斯涌出量进行了预测，其结果为高产高效工作面瓦斯涌出规律的研究及预测奠定了基础。     

人工神经网络在瓦斯涌出量预测中的应用

当采掘工作面遇有岩浆岩破坏煤系和煤层时,地质条件尤为复杂,采用常规的矿山统计法和瓦斯含量法预测瓦斯涌出量难以取得理想的结果.作者从矿井地质综合分析入手,采用BP神经网络的方法建立了适用于矿井未采区瓦斯涌出量的预测模型,分别用48个4-2煤层、40个7-2煤层钻孔点的煤层瓦斯质量体积、煤层埋藏深度、煤质、火成岩分布、顶底板砂泥岩比值等数据作为输入层,预测地质条件相对复杂矿井的瓦斯涌出量.经已采区实测值与预测值比较分析认为,预测结果可信.     

漳村煤矿设瓦斯巷综放面瓦斯分布及涌出特征

由于综放工作面开采强度大,引起瓦斯涌出量成倍增加,严重制约着工作面的安全生产．针对瓦斯涌出强度大的问题,通过在山西潞安矿务局漳村煤矿综放工作面布置测点、测线,进行现场观测和研究,分析论述了工作面设置排放瓦斯巷解决瓦斯严重超限问题时,综放工作面的瓦斯分布状况及涌出特征．     

瓦斯分布与风量及瓦斯涌出量关系的数值模拟

煤矿瓦斯事故频发,危害严重,用计算机模拟矿井掘进巷道中的瓦斯分布与积聚是优化通风方案的重要手段.本文根据流体动力学理论,对局部通风掘进巷道中的瓦斯分布与积聚进行数值模拟,分析了在风量和瓦斯涌出量变化的情况下瓦斯体积分数的分布规律.结果表明,当风量和瓦斯涌出量成比例变化时,低体积分数区域的瓦斯大致按比例变化,高体积分数区域的瓦斯体积分数并不是成比例变化.     

Numerical analysis of gas emission rule from a goaf of tailing roadway

Targeting the problem of large amounts of gas emission from the goaf of the No.14201 working face in the Shaqu coal mine of Huajin Coking Coal Co. Ltd., we used a negative exponential function to describe the attenuation process of gas emission in goaf (the stable source) based on the principle of field flow. Equations of two-component flow (gas and air) and see- page-diffusion in a heterogeneous goaf flow field are solved by means of numerical simulation and fluid mechanics principles of air movement and gas distribution during gas emission from goaf. The results indicate that the air diversion volume has a negative, exponential relation with the volume of gas emitted from goaf to the working face and is clearly inversely related to gas concentration. We calculated the minimum amount of air diversion and distributed air volume in the tailing roadway required for safe production.     

严重突出回采工作面瓦斯综合治理

根据工作面掘进期间瓦斯突出危险性、瓦斯涌出特点及回采前瓦斯预抽效果等资料的综合分析 ,对回采工作面进行块段划分并有针对性地采取工作面瓦斯抽放、浅孔松动爆破、控制回风流瓦斯浓度等防治突出措施 ,有效地防止了回采期间煤与瓦斯突出 .     

采场风流模拟实验台研制

本文从采场风流流动及瓦斯运移数学模型导出模型实验的相似准则,指导实验台设计。采用新型的实验材料和独特的采空区充填技术加工制做的多功能、组合式采场风流模拟实验台,具有设计结构合理、密封性能良好、重量轻、采空区充填带调整简单易行、风流流动及瓦斯涌出状态易控制、模型倾角任意可调等特点。预备实验证明,用该实验台研究采场风流流动及瓦斯运移规律是可行的。     

中国采煤工作面瓦斯涌出规律及其控制研究

将采煤工作面瓦斯来源划分为煤壁、采落煤和采空区３部分,并给出了各部分瓦斯涌出量的计算公式,研究了回采过程,煤层群不同的开采顺序以及厚煤层分层开采时的瓦斯涌出 述了中国煤矿采矿工作面采用不同的通风系统、脉冲通风以及瓦斯抽放等控制瓦斯涌出的原理与技术的新成果,介绍了瓦斯涌出量达１５０ｍ＾３／ｍｉｎ的综采放顶煤工作面瓦斯控制技术实例。     

近距离保护层开采采场下行通风瓦斯涌出及分布规律

平煤集团四矿在开采过程中工作面φ（CH4）频繁超限,影响了工作面正常安全生产．通过;理论分析,阐述了采空区内风流流动状况和采用不同通风方式时采空区的瓦斯涌出规律．结合现场实验,探讨了工作面采用下行风时采空区的瓦斯涌出和分布规律．在此基础上,提出了用下行风解决工作面瓦斯超限问题．结果表明,在采用下行通风后,采空区绝对瓦斯涌出量为上行风时的80％,工作面φ（CH4）下降了75％,瓦斯不再超限．     

Characteristics of Gas Emission at Super-Length Fully-Mechanized Top Coal Caving Face

Characteristics of gas emission at the K8206 working face in the Third mine of the Yangquan Coal Group were investigated.The effects of strata movement, advancing velocity of working face, production capacity of working face and gas extraction capability of strike high-level entry on gas emission at K8206 working face were analyzed.A regression equation, reflecting the relationship between relative gas emission rate and the production capacity of working faces, was established.Another regression equation showing the relationship between the gas emission rate from adjacent layers when the working face was advancing for one metre and advancing velocity was derived.It can be concluded that, 1) the amount of gas emitted at the K8206 working face is far greater than that of ordinary top coal caving faces with a dip length of 180-190 m; 2) the dynamic process of gas emission from adjacent layers during the initial mining stage is controlled by the movement of key strata; 3) the amount of gas emitted that needs to be forced out by air is greatly affected by the capability of gas extraction; 4) when the advancing velocity is between 3.5-5.5 m/d or when the output is up to 8-12 kt/d, the gas emission from adjacent layers is almost constant.     

煤矿采区瓦斯抽放系统设计及应用

当工作面瓦斯浓度较高,采用通风方法无法解决时,必须建立瓦斯抽放系统实施瓦斯抽放.针对郑煤集团芦沟煤矿的32101采煤工作面瓦斯浓度较高的情况,设计了采煤工作面瓦斯抽放系统,具体包括管路敷设路线、管径、瓦斯抽放泵、抽放孔布置和参数以及相应安全技术措施.应用表明,该瓦斯抽放系统有效地降低了32101工作面瓦斯涌出量,保证了该采煤工作面的安全生产.     

Numerical simulation to determine the gas explosion risk in longwall goaf areas: A case study of Xutuan Colliery

Underground gassy longwall mining goafs may suffer potential gas explosions during the mining process because of the irregularity of gas emissions in the goaf and poor ventilation of the working face, which are risks difficult to control. In this work, the 3235 working face of the Xutuan Colliery in Suzhou City, China, was researched as a case study. The effects of air quantity and gas emission on the three-dimensional distribution of oxygen and methane concentration in the longwall goaf were studied. Based on the revised Coward’s triangle and linear coupling region formula, the coupled methane-oxygen explosive hazard zones (CEHZs) were drawn. Furthermore, a simple practical index was proposed to quantitatively determine the gas explosion risk in the longwall goaf. The results showed that the CEHZs mainly focus on the intake side where the risk of gas explosion is greatest. The CEHZ is reduced with increasing air quantity. Moreover, the higher the gas emission, the larger the CEHZ, which moves towards the intake side at low goaf heights and shifts to the deeper parts of the goaf at high heights. In addition, the risk of gas explosion is reduced as air quantities increase, but when gas emissions increase to a higher level (greater than 50 m³/min), the volume of the CEHZ does not decrease with the increase of air quantity, and the risk of gas explosion no longer shows a linear downward trend. This study is of significance as it seeks to reduce gas explosion accidents and improve mine production safety.