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在分析影响南桥煤矿5号煤层采掘瓦斯涌出量影响因素的基础上,对矿井未采区瓦斯等级及涌出量进行了预测。 相似文献
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低瓦斯矿井煤层瓦斯异常涌出的研究 总被引:1,自引:0,他引:1
以典型的低瓦斯矿井为例,详细探讨了煤层瓦斯异常涌出现象,分析了影响瓦斯涌出的地质因素和采掘因素,并对瓦斯异常涌出防治进行了研究。首次运用瓦斯地质理论研究低瓦斯矿井瓦斯异常涌出问题,形成了系统的低瓦斯矿井瓦斯地质规律的研究思路和方法。 相似文献
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地层矿区位于宁镇褶皱带的仑山背斜南翼。为一单斜构造。青龙灰岩中偶见小型褶曲,煤层中具波状起伏。未见大的褶曲构造。该井田主要以北西方向张性断裂为主.有对断层带内伴有火成岩侵入体。 相似文献
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工作面瓦斯涌出量是采面通风设计及制定采面瓦斯防治措施的主要依据。在收集陈家山煤矿大量瓦斯地质资料基础上,分析了矿井主采4-2号煤层采面瓦斯涌出规律及其影响因素,研究认为,采面瓦斯涌出量为矿井主要瓦斯来源,其涌出量与煤层埋藏深度、煤层瓦斯含量、顶板含油气小街砂岩厚度及工作面日产量等主要控制因素呈正相关关系;采用数学建模方法建立了采面瓦斯涌出量预测模型,编制了采面瓦斯涌出量预测图,结果显示4-2号煤层采面绝对瓦斯涌出量总体呈现出由井田浅部向中部迅速增大,再由中部到深部逐渐减少的变化趋势。 相似文献
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同水平煤层相对瓦斯涌出量的回归分析模型 总被引:4,自引:0,他引:4
利用数理统计学原理,建立了淮南谢二矿-450m水平不同煤层的相对瓦斯涌出量与煤层厚度、煤层结构破碎程度的回归分析模型,表明在同一地质单元同水平条件下,煤层厚度越大,结构越破碎,其相对瓦斯涌出量越大。 相似文献
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煤油气共生矿井的采面瓦斯涌出预测 总被引:1,自引:1,他引:0
以煤系含油气的陈家山煤矿综采工作面瓦斯地质资料为依据,应用灰色系统理论中的关联分析方法,在研究影响采面瓦斯涌出量主控地质与生产因素的基础上,借助人工神经网络理论中的BP网络方法,建立了综采工作面瓦斯涌出量预测的BP网络模型。通过误差分析及实际应用,证明将关联分析与BP网络结合起来开展采面瓦斯涌出量预测是一种可行的方法。 相似文献
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The spatial distribution of inter-layer shear zones is studied, based on the fully mapped inter-layer shear zones at the Gaobazhou dam site on the Qingjiang River in Hubei province, China. The field observations revealed that two types of inter-layer shear zone, under-developed and well-developed, are distributed differently. The former are associated with the incompetent rock layers, and the latter are controlled by the inter-bed folds and lithological properties of the strata. To represent their lithological properties geomechanically, data on strength by the Schmidt hammer test and thickness of each field-identified rock layer were collected to form strength sequences and thickness sequences. The adjacent rock layers of similar strength are then grouped, and two grouped sequences are combined into a single sequence, whose individual term is the strength weighted by the exponential function value of the centralized thickness (SCT). The rescaled range (R/S) analysis results of SCT (SCT-R/S), taking into account the presence of inter-bed folds, are in good agreement with R/S analysis results of the spacing sequence of the well-developed inter-layer shear zones. Thus the SCT-R/S model has the potential to predict their spatial distributions. 相似文献
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基于滇东上二叠统赋煤区煤层的煤岩学特征、瓦斯含量、瓦斯涌出量及煤矿瓦斯事故统计分析,对研究区煤层的煤岩组成、煤体结构、煤炭筛分试验成果、煤层瓦斯含量和煤矿瓦斯涌出量进行了比对研究。研究表明:煤变质程度、显微煤岩组分、筛分粒级煤及煤的孔隙率等煤岩学特征控制了瓦斯的分布特征,并造成煤矿瓦斯涌出呈现区域性的差异;滇东上二叠统赋煤区瓦斯涌出类型可分为低煤阶均匀涌出型、中煤阶均匀涌出型、中煤阶非均匀突出型、高煤阶均匀涌出型和高煤阶非均匀突出型,且以中煤阶均匀涌出型为主。 相似文献
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This paper uses two-dimensional boundary element method (BEM) numerical modeling to analyze the deformation and failure behavior of a coal seam and to understand the nature of gas flow into a roadway entering the Barapukuria coal mine in Bangladesh. The Barapukuria basin contains Permian-aged Gondwana coals with high volatile B bituminous rank. Three models (A, B, and C) are presented here. Model A assumes horseshoe-shaped geometry, model B assumes trapezoid-shaped geometry, and model C assumes horseshoe-shaped geometry coupled with a roof fall-induced cave generated by the break-up of rock materials along the vertical dimension of an igneous dyke. The simulation results show that there is little difference in strata deformation between models A and B. In model A, there is no horizontal tensional stress and the overall horizontal stress patterns are compressive, while the distribution and magnitude of vertical stress show higher tensional stresses on the immediate rib sides and floor. In model B, both horizontal and vertical stress distributions indicate low to medium tensional stresses on the immediate roof, floor, and rib sides, but compressive stresses are prominent toward the interior of the coal seam. Deformation vectors indicate that failure extends laterally to about 7.5 m around the excavation geometry.On the contrary, for model C, the distributions and magnitudes of horizontal and vertical stress show higher tensional stresses in both rib sides of the roof fall zone. The deformation around the dyke-induced perturbation zone affects a large volume of coal. The deformation vectors with high magnitudes are nearly horizontal and propagate laterally up to 30 m; whereas, low-magnitude deformation vectors extend about 25 m toward the roof and 20 m toward the floor. The vertical tensional displacement, which is concentrated in the floor and the left and right hand sides of the roof, propagates about 30 m on both sides and about 22 m in the floor. From these simulation results, it is thought that the extension of the dyke-induced perturbation zone toward the roof, floor, and rib sides of the entry roadway initially creates small tensional cracks that gradually grow into large-scale tensional features. These features could also be responsible for high concentrations of gas, which are emitted into the mine from fractured coals due to insufficient mine ventilation and low atmospheric pressure. 相似文献
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地应力在软岩或深部煤矿设计、施工与安全生产中具有重要作用。采用空心包体应变计法对朱仙庄煤矿南翼II、III水平进行了地应力原位测试,获得了该矿地应力大小及主要方位;以此作为约束条件,基于多目标约束的最优化方法利用ANSYS软件建立了朱仙庄煤矿南翼地应力最优化反分析模型,反演得出了最优边界条件,并用数值分析了该区域地应力分布特征和变化规律。结果表明:朱仙庄煤矿南翼地应力以水平构造应力为主,且具有明显的方向性,最大主应力值变化范围是20~25 MPa,方位则分布在N 60°E和N 75°E之间,其水平地应力非均匀系数为1.1~1.8。 相似文献
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对白音华三号露天煤矿复合边坡稳定性进行评价。借助理正软件,采用极限平衡法计算的稳定系数为评价指标,通过多因素敏感性分析认为,地震作用、粘聚力、内摩擦角、地下水位和重度等因素对该边坡稳定参数的敏感性依次变小。这一研究结论与工程实际基本相符。 相似文献
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为了提高瓦斯涌出量预测精度,针对瓦斯涌出量影响因素的多重相关性、复杂性等问题,结合主成分分析法和分源预测理论,对开采层、邻近层、采空区的瓦斯涌出量数据分别进行主成分分析降维,得到预测指标。针对极限学习机(ELM)存在的输入权值矩阵与隐含层阈值随机生成的问题,利用模拟退火粒子群算法(SAPSO)对极限学习机的参数寻优,将新疆某煤矿回采工作面瓦斯涌出量及影响因素作为SAPSO-ELM模型的输入进行训练,再利用训练好的SAPSO-ELM模型对陕西某煤矿回采工作面的瓦斯涌出量进行验证预测,并对比原始ELM模型的预测结果。结果表明,SAPSO-ELM模型的平均相对误差为3.45%,ELM模型的平均相对误差为8.81%,与ELM模型相比,SAPSO-ELM模型预测精度及效率均优于原始ELM模型。分源预测理论和主成分分析法的结合有效解决了多因素间的多重相关性并降低了预测模型的复杂度,SAPSO-ELM预测模型实现了瓦斯涌出量的快速精准预测,对预防瓦斯事故发生和保障煤矿安全高效开采具有较好的指导作用。 相似文献
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三峡水库区滑坡时间记录的R/S分析 总被引:5,自引:0,他引:5
文章对统计的三峡库区滑坡的发生时间和规模运用时间记录分析,得到滑坡发生的年份统计规律及其发展趋势。首先对所有规模大于等于1×104m3滑坡进行分析,然后将这些滑坡按其规模划分不同等级,分别运用R/S方法进行时间记录分析,结果表明:不同规模等级滑坡的Hurst关系具有相似的特征,这一结果反映了不同规模等级的滑坡之间的统计相似性。研究区滑坡时间分布的Hurst指数均大于0.5,表明了滑坡发生具有规律和随机的双重性质。而Hurst指数偏离0.5的程度就衡量了随机性因素与确定性因素在滑坡时间分布中所占的比重。运用R/S方法,可以对一定时间范围内的滑坡涨落做出估计。 相似文献
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西昆仑山甜水海钻孔氧化铁指标的R/S分析及其意义 总被引:17,自引:0,他引:17
运用R/S分析法,对经过等时处理的甜水海钻孔氧化铁3项指标FeO、Fe2O3及其比值FeO/Fe2O3进行了分析计算,其指标都存在明显的Hurst现象,Hurst指数H分别为:Fe2O3为0.76,FeO为0.85,FeO/Fe2O3为0.65,它们都大于0.5。反映了该地区过去20多万年来气候环境变化存在持续性。3者Hurst指数存在差异的原因目前还不清楚,可能说明它们反映气候环境演化持续性强度 相似文献