司马煤矿瓦斯地质规律研究及突出危险区预测

矿井瓦斯赋存分布规律研究涉及瓦斯风化带的确定和影响煤层瓦斯赋存的主控地质因素两个方面.结合司马煤矿煤层瓦斯情况,运用地质构造控制逐级制理论分析了矿井的瓦斯赋存特征,确定了3号煤层的瓦斯风化带、瓦斯的赋存形式及影响煤层瓦斯赋存的地质因素,揭示了3号煤层瓦斯聚集规律,分析了矿井瓦斯突出危险性指标,运用单项指标法对3号煤层煤与瓦斯突出危险区进行预测,为合理开发利用煤层瓦斯,防治煤与瓦斯突出和今后的安全生产提供了科学依据.     

沙曲矿井瓦斯地质规律研究

运用地质构造控制理论分析了沙曲矿井的瓦斯赋存特征,初步总结了沙曲矿井的瓦斯地质规律.针对矿井4号煤层瓦斯含量高、平面上具有从东向西逐渐增大的特点,从瓦斯地质学的角度指出一定的地质构造条件、煤层上覆基岩厚度差异大、致密的顶底板岩性、复杂的水文地质条件及煤的变质程度是沙曲矿井煤层瓦斯赋存规律的主控因素.并利用数值回归分析的方法,建立了上覆基岩厚度与瓦斯含量的数学预测模型,为预测深水平的瓦斯含量奠定了基础,为瓦斯防治工作提供了依据.     

黄陵二号煤矿瓦斯地质规律及涌出量预测

用地质观点研究煤层瓦斯赋存已获得实践检验,瓦斯的赋存及涌出与地质因素密不可分.在收集并整理黄陵二号煤矿井田地质资料和瓦斯资料的基础上,分析了井田地质构造特征,结合瓦斯地质理论,研究地质构造、煤层顶底板岩性、煤层埋藏深度、水文地质条件等因素对瓦斯赋存的影响,融合矿井勘探及生产期间实测瓦斯含量数据,采用瓦斯地质统计法建立回采面绝对瓦斯涌出量与煤层瓦斯含量的关系式,并以此对矿井未采区的瓦斯涌出量进行了预测.     

艾维尔沟矿区瓦斯地质规律研究

运用瓦斯地质理论,结合地质勘探和矿井生产揭露的瓦斯地质资料,研究了艾维尔沟矿区的瓦斯地质规律.综合分析了地质构造、煤层埋深、构造演化、煤变质程度等对煤层瓦斯赋存的影响.提出了煤层埋深是艾维尔沟矿区煤层瓦斯赋存区域的主控因素,同时受构造演化、煤变质程度等因素影响,在局部区域受地质构造因素控制明显.因各种因素的共同作用,在沿煤层走向上,同一水平标高,矿区西部瓦斯含量最高,东部次之,中部最小;沿煤层倾向方向上,瓦斯含量具有随煤层埋深的增加而增大的整体趋势.在向斜构造轴部及断层带附近瓦斯富集.     

鄂庄煤矿2煤层瓦斯地质规律研究

通过对鄂庄煤矿 2煤层采掘区井下钻孔瓦斯煤样直接法测试结果及勘探钻孔瓦斯样资料的综合分析 ,阐明了影响鄂庄井田 2煤层瓦斯赋存的主要地质因素和矿井未采区煤层瓦斯含量预测的思路和方法 .探讨了鄂庄井田 2煤层瓦斯赋存的规律 .在分析低瓦斯矿井瓦斯涌出特点和影响因素的基础上 ,指出瓦斯异常涌出是低瓦斯矿井瓦斯防治的重点     

鄂庄煤矿2煤层瓦斯地质规律研究

通过对鄂庄煤矿2煤层采掘区井下钻孔瓦斯煤样直接法测试结果及勘探钻孔瓦斯样资料的综合分析,阐明了影响鄂庄井田2煤层瓦斯赋存的主要地质因素和矿井未采区煤层瓦斯含量预测的思路和方法.探讨了鄂庄井田2煤层瓦斯赋存的规律.在分析低瓦斯矿井瓦斯涌出特点和影响因素的基础上,指出瓦斯异常涌出是低瓦斯矿井瓦斯防治的重点.     

黄岩汇煤矿瓦斯地质规律及区域预测

在收集整理黄岩汇煤矿地质资料和瓦斯资料的基础上,运用地质构造控制理论,展开井下实测和地质编录,以分析矿区和井田地质构造分布特征,研究地质构造、顶底板岩性、煤层埋藏深度等地质因素对瓦斯赋存的影响,得出了井田内15号煤层瓦斯含量分布规律和构造煤的分布规律;同时,对黄岩汇煤矿15号煤层突出危险性也进行了区域预测．研究表明,煤层埋藏深度是影响黄岩汇煤矿15号煤层瓦斯含量分布的主控因素,其他地质因素仅仅影响煤层瓦斯的局部变化;将埋深大于321m的15号煤层划分为突出危险区,其余的则为非突出危险区．     

金发煤矿开采层瓦斯地质规律研究及危险性预测

矿井瓦斯赋存规律及涌出量预测是矿井瓦斯治理的重要理论依据.深入研究分析了金发煤矿瓦斯地质赋存规律控制因素,定性分析了金发煤矿地质构造、煤层上覆基岩厚度、顶底板岩性、水文地质条件等控制要素,确定埋深是影响矿井C8、C9煤瓦斯含量最重要因素.结合矿井实测瓦斯涌出量,预测了煤与瓦斯区域突出危险性.结果表明:煤层埋深与瓦斯含量呈正相关关系;瓦斯压力是判定该矿C8、C9煤瓦斯突出危险性的最重要指标,矿界内煤层瓦斯压力大于0.74 MPa的区域具有突出危险性,煤矿的突出危险区主要在矿界西北边靠近矿2坐标点附近.     

金鑫矿二_1煤层瓦斯赋存规律及其控制因素分析

针对金鑫矿二1煤层瓦斯分布存在的不均衡特性,研究其瓦斯赋存规律。在大量瓦斯基础数据测试的基础上,结合矿井的地质构造和煤层情况,找出影响其瓦斯赋存的控制因素,即埋藏深度、地质构造、顶底板岩性和煤层露头等。结果表明:金鑫矿二1煤层瓦斯含量在倾向上随埋深增加而增大,瓦斯赋存总体呈"东南低,西北高"的规律。此结果对于金鑫矿制定合理有效的瓦斯防治措施具有指导作用。     

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.     

超细煤粉粒度对煤质分析特性的影响

对不同粒度的超细煤粉进行了粒度粉细和煤质分析测定,研究了超细煤粉的煤质分析特性随粒度的变化规律。对超细煤粉的工业分析表明,水分含量基本不随煤粉粒度的变化而变化;随着煤粉颗粒粒度的减小,灰分含量增大,挥发分含量减小。对超细煤粉的元素分析表明,由于煤粉偏析,随着煤粉颗粒粒度的减小,C,H 和 N 含量降低,O 和 S 含量增大。     

Application of coal mine roof rating in Chinese coal mines

The coal mine roof rating(CMRR) is a measure of roof quality or structure competency for bedded roof types typically of underground coal mines. The CMRR has been used widely in the US, South Africa,Canada and Australia. In order to investigate the application of the CMRR system in Chinese coal mines,two coal mines in China located in Panjiang Coal Field in Guizhou Province were investigated. Field data were collected which is required to calculate the CMRR value based on underground exposure. The CMRR values of 11 locations in two coal mines were calculated. The investigations demonstrated that the chance of mine roof failure is very low if the CMRR value is more than 50, given adequate support is installed in mine. It was found that the CMRR guideline are useful to preliminarily investigate stability in Panjiang Coal Field mines.     

Rockburst mechanism in soft coal seam within deep coal mines

A number of rockburst accidents occurring in soft coal seams have shown that the rockburst mechanism involved in soft coal seams is significantly different from that involved in hard coal seams. Therefore, the method used to evaluate rockburst in hard coal seams is not applicable to soft coal seams. This paper established an energy integral model for the rockburst-inducing area and a friction work calculation model for the plastic area. If the remaining energy after the coal seam is broken in the rockburstinducing area is greater than the friction work required for the coal to burst out, then a rockburst accident will occur. Mechanisms of ‘‘quaking without bursting" and ‘‘quaking and bursting" are clarified for soft coal seams and corresponding control measures are proposed as the optimization of roadway layouts and use of ‘‘three strong systems"(strong de-stressing, strong supporting, and strong monitoring).     

Developing coal burst propensity index method for Australian coal mines

Coal burst is the violent failure of overstressed coal, and it is often accompanied by sound, coal ejection and seismic events. It is subsequently recognized as a serious safety risk of Australia after double fatalities coal burst happened at Austar Coal Mine. Considering the increasing trend of coal burst severity and frequency with mining depth, it is an urgent task to develop the coal burst risk assessment methods for Australia underground coal mines. Coal burst propensity index method is a widely used method of burst risk evaluation of coal as it is summed up from the coal burst research and practice of many countries.This paper presents the experimental and theoretical research of coal burst propensity index method for coal burst risk assessment in Australia. The definition of four indexes including elastic strain energy index(W_(ET)), bursting energy index(K_E), dynamic failure time(DT) and uniaxial compression strength(RC)is introduced in the first part. Then, the standard laboratory test process and test parameter of coal burst propensity index is presented. DT test is conducted with 0.3 mm/min displacement control loading rate while other test is with 0.5 mm/min. Besides, modified data processing and risk classification method of test are proposed. Differentiate analysis of stress-strain curve is adopted in the data processing of DT and KEindex. A four level risk classification form of burst risk is recommended for Australian underground coal mines. Finally, two likely improvement methods of W_(ET) test, including volumetric strain indicator method and theoretical calculation method, are discussed.     

改善平沟煤矿16~#煤层润湿性的研究

煤层注水现已成为矿井预防重大事故的综合性安全技术措施.煤层注水是以解决采煤工作面煤尘问题而发展起来的,后来又逐渐应用于预防冲击地压,提高瓦斯抽放效等方面.煤体注水的好处很多,但是不同煤质会对注水造成不同的影响.针对平沟16#煤润湿性差的现象进行了研究,并提出了添加尼诺尔、十二烷基苯磺酸钠和2种表面活性剂改善其煤体的润湿性,以提高煤体注水的效果.     

不同煤体结构煤的f值分布特征

以淮南煤田C13-1煤层不同煤体结构类型煤的118个坚固性系数(f值)测定资料为基础,分析了不同煤体结构煤的f值分布特征和统计规律,说明了煤体破坏与f值的相互关系,并提出将f值作为硬煤和构造软煤的分类指标.     

灵武煤制水煤浆中试实验研究

本实验探讨了在大剂量条件下,添加剂加入量、种类、球料比、研磨时间、配置浓度对灵武煤制水煤浆成浆性的影响.结果表明,理想的制浆工艺条件是添加剂干基添加量0.3%,球料比8∶1～10∶1,研磨时间30 min,研磨转速22 r/min,配浆浓度69%.     

Review of coal and gas outburst in Australian underground coal mines

Outburst of coal and gas represents a significant risk to the health and safety of mine personnel working in development and longwall production face areas. There have been over 878 outburst events recorded in twenty-two Australian underground coal mines. Most outburst incidents have been associated with abnormal geological conditions.Details of Australian outburst incidents and mining experience in conditions where gas content was above current threshold levels are presented and discussed. Mining experience suggests that for gas content below 9.0 m³/t, mining in carbon dioxide (CO₂) rich seam gas conditions does not pose a greater risk of outburst than mining in CH₄ rich seam gas conditions. Mining experience also suggests that where no abnormal geological structures are present that mining in areas with gas content greater than the current accepted threshold levels can be undertaken with no discernible increase in outburst risk. The current approach to determining gas content threshold limits in Australian mines has been effective in preventing injury from outburst, however operational experience suggests the current method is overly conservative and in some cases the threshold limits are low to the point that they provide no significant reduction in outburst risk. Other factors that affect outburst risk, such as gas pressure, coal toughness and stress and geological structures are presently not incorporated into outburst threshold limits adopted in Australian mines. These factors and the development of an outburst risk index applicable to Australian underground coal mining conditions are the subject of ongoing research.     

构造煤及其对煤与瓦斯突出的控制作用

高空隙率、低透气性使构造煤能够保持较高的瓦斯压力 ;破碎性、“隔离”作用及“气垫”作用 ,使构造煤抵御外力作用的能力大大降低 ;构造煤变形幅度大的特性 ,为瓦斯的迅速解吸、放散和快速流动创造了条件 ;构造煤薄弱分层或“通道层”的存在 ,则为煤与瓦斯突出的初始激发和持续发展奠定了基础 ;上述因素的共同作用 ,影响和制约了煤与瓦斯突出的强度和分布 .尽管如此 ,一定厚度的构造煤的存在只是发生煤与瓦斯突出的必要条件和有利条件 ,而非充分条件 .