张集煤矿11418综采工作面瓦斯综合治理技术

在对张集煤矿11418综采工作面瓦斯来源分析的基础上,采用分源预测法预测出该面最大相对瓦斯涌出量为6.15m3/t,最大绝对瓦斯涌出量为34.2m3/min.提出了采用风排、高抽巷、顶板高位钻孔永久抽放系统和上隅角埋管移动抽放系统综合治理采面瓦斯的技术思路,确定了永久和移动抽放系统的瓦斯抽放参数,进行了主要抽放设备的选型,提出了治理效果的监测方法,为高瓦斯工作面提供了一套合理的瓦斯治理技术及参考方案.     

提高回采工作面瓦斯抽放率的途径

通过对已试抽工作面的瓦斯抽放效果分析,对抽放钻孔直径、钻孔间距、抽放负压、封孔深度等直接影响瓦斯抽放率的因素进行了研究改进.探寻了戊组煤层钻孔瓦斯涌出规律,并提出了适合戊组煤层的合理瓦斯抽放参数.     

提高回采工作面瓦斯抽放率的途径

通过对已试抽工作面的瓦斯抽放效果分析 ,对抽放钻孔直径、钻孔间距、抽放负压、封孔深度等直接影响瓦斯抽放率的因素进行了研究改进 .探寻了戊组煤层钻孔瓦斯涌出规律 ,并提出了适合戊组煤层的合理瓦斯抽放参数 .     

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.     

瓦斯"截流抽放"快速揭煤法

通过对石门待揭煤体周边进行瓦斯"截流抽放",并利用瓦斯抽放所形成的无突出危险煤体作为防突抵抗煤柱,再对待揭煤体内已成"无源之水"的瓦斯实施强力快速抽放消突,即可进行安全快速揭煤.     

高瓦斯综放采煤工作面瓦斯综合治理方案

针对佳新煤矿1504综放工作面瓦斯的实际情况,分析了该工作面的瓦斯主要涌出来源及涌出量,结合该矿通风系统及瓦斯抽采现状,在上下顺槽顺层、上隅角、措施巷道等采用钻孔、高位钻场、埋管、吊管多种方式抽放,以及增加工作面风量和局部风机对上隅角供风等综合措施治理瓦斯,从而解决了上隅角及回风巷瓦斯超限问题,确保了工作面安全高效生产,真正实现了高瓦斯综放工作面的高产高效。     

煤层瓦斯抽放钻孔的二次封孔方法研究

针对煤层钻孔抽放瓦斯后煤层孔隙裂隙发育致使瓦斯浓度下降,钻孔有效抽放期缩短的技术难题,首次提出二次封孔方法.阐述了二次封孔方法的基本原理,建立了微细膨胀粉料颗粒在孔隙裂隙中运动的数学模型,并在晋城煤业集团公司寺河矿开展了6个月的现场工业性试验.结果表明:应用二次封孔方法可提高瓦斯抽放浓度25%～50%,延长钻孔的有效瓦斯抽放期3个月.     

影响综放工作面瓦斯涌用的主要因素分析

对阳泉矿区影响综放工作面瓦斯涌出的主要因素作了详细分析，并据此提出了相应的瓦斯治理手段。     

深孔预裂爆破强化抽放瓦斯的研究

介绍了煤体预裂爆破的机理及深孔预裂爆破抽放瓦斯的工艺试验研究，对预裂爆破抽放效果进行了详细分析，得出了深孔预裂爆破强化抽放瓦斯方法能够大幅度提高煤层瓦斯抽放效果，实现快速抽放的结论。     

大采高综采工作面瓦斯与煤自燃综合治理技术

针对张集煤矿1215（3）高产高效综采工作面高瓦斯、易自燃开采过程中的安全问题,本文介绍了大采高综采工作面采空区顶板高位抽采技术,优化顶板走向钻孔位置,结合顺层钻孔和上隅角埋管等抽采瓦斯措施综合治理瓦斯,同时采取均压通风、加快工作面推进速度、采空区灌浆、注氮等技术措施防治煤自燃,保证了回采期间回风流瓦斯浓度平均小于0.5%,CO浓度20PPm以下,实现了工作面的正常安全生产。研究成果为淮南矿区一次采全高高产高效工作面的瓦斯、防火治理提供了借鉴经验。     

综合机械化固体充填采煤的充填体时间相关特性研究

采用MTS 815.02电液伺服岩石力学试验系统对综合机械化固体充填采煤技术中的矸石与粉煤灰充填体的时间相关特性进行了测试,得到了3,7,13和20MPa压力条件下矸石与粉煤灰充填体时间相关特性曲线,应用流变的基本理论,选取PTh体作为矸石与粉煤灰充填体的流变模型,并建立了流变方程;根据矸石充填体时间相关性试验结果及试验矿井的相关数据,计算得出流变参数K1,K2,η,并得到综合机械化固体充填采煤工作面顶板的下沉量与时间的具体流变方程,根据流变方程得出了综合机械化固体充填采煤工作面顶板的下沉量与时间关系曲线,并得出当经历1 000h(约40d)之后,充填体流变进入稳定阶段,其变形量逐渐趋于定值,最大值约340mm.     

综采放顶煤与瓦斯突出的耦合关系研究

对煤与瓦斯突出发生的综合作用机理及治理技术进行总结,从宏观上提出治理煤与瓦斯突出的技术手段;分析总结我国综采放顶煤开采的技术成果,讨论了工作面应力分布规律和顶煤变形规律对突出的影响;认为具突出危险性的厚煤层采用综采放顶煤开采法对消突是有积极作用的.     

综采放顶煤与瓦斯突出的耦合关系研究

对煤与瓦斯突出发生的综合作用机理及治理技术进行总结,从宏观上提出治理煤与瓦斯突出的技术手段;分析总结我国综采放顶煤开采的技术成果,讨论了工作面应力分布规律和顶煤变形规律对突出的影响;认为:具突出危险性的厚煤层采用综采放顶煤开采法对消突是有积极作用的.     

新登煤矿三水平综放工作面瓦斯涌出量预测

通过采用分源法和矿山统计法相结合的预测方法,综合分析得出了三水平初期开采阶段工作面采用轻放工艺回采时的瓦斯涌出量,极大地指导了矿井下一步的瓦斯管理和安全生产.     

新登煤矿三水平综放工作面瓦斯涌出量预测

通过采用分源法和矿山统计法相结合的预测方法,综合分析得出了三水平初期开采阶段工作面采用轻放工艺回采时的瓦斯涌出量,极大地指导了矿井下一步的瓦斯管理和安全生产.     

Effect of suppressing dust by multi-direction whirling air curtain on fully mechanized mining face

A combined method of numerical simulation and field testing was adopted in this study in the interest of solving the problem of hard to control high concentrate dusts on a fully mechanized mining face.In addition,the dust suppression effect of a multi-direction whirling air curtain was studied in this paper.Under the influence of the wall attachment effect,the compressed air which blows out from the two-phase or three-phase radial outlets on the generator of the air curtain can form a multi-direction whirling air curtain,which can cover the whole roadway section of a fully mechanized mining face.The traditional method of controlling dust is a forcing system with exhaust overlap which has the major disadvantage of lacking a jet effect and consequently results in poor dust control.It is difficult to form the air flow field within the range of L_p5Sr^1/2.However,due to the effect of this novel system,the radial airflow can be turned into axial airflow allowing fresh air to flow through the length of the heading.The air flow field which is good at controlling dust diffusion can be formed 12.8 m from the heading face.Furthermore,the field measurement results show that before the application of a multi-direction whirling air curtain,the dust concentration is 348.6 mg/m³ and 271.4 mg/m³ respectively at the roadway cross-section measurement points which are 5 m and 10 m from the heading face.However,after the application of the multi-direction whirling air curtain,the dust concentration is only 61.2 mg/m³ and 14.8 mg/m³,respectively.Therefore,the dust control effect of a multi-direction whirling air curtain is obvious.     

System dynamics model of the support-surrounding rock system in fully mechanized mining with large mining height face and its application

Fully mechanized mining with large mining height (FMMLMH) is widely used in thick coal seam mining face for its higher recovery ratio, especially where the thickness is less than 7.0 m. However, because of the great mining height and intense rock pressure, the coal wall rib spalling, roof falling and the instability of support occur more likely in FMMLMH working face, and the above three types of disasters interact with each other with complicated relationships. In order to get the relationship between each two of coal wall, roof, floor and support, and reduce the occurrence probability of the three types of disasters, we established the system dynamics (SD) model of the support-surrounding rock system which is composed of “coal wall-roof-floor-support” (CW-R-F-S) in a FMMLMH working face based on the condition of No. 15104 working face in Sijiazhuang coal mine. With the software of Vensim, we also simulated the interaction process between each two factors of roof, floor, coal wall and the support. The results show that the SD model of “CW-R-F-S” system can reveal the complicated and interactive relationship clearly between the support and surrounding rock in the FMMLMH working face. By increasing the advancing speed of working face, the support resistance or the length of support guard, or by decreasing the tip-to-face distance, the stability of “CW-R-F-S” system will be higher and the happening probability of the disasters such as coal wall rib spalling, roof falling or the instability of support will be lower. These research findings have been testified in field application in No. 15104 working face, which can provide a new approach for researching the interaction relationship of support and surrounding rock.     

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 .     

Backfilling technology and strata behaviors in fully mechanized coal mining working face

Based on the principle of fully mechanized backfilling and coal mining technology and combined with theXingtai Coal Mine conditions,we mainly optimized the coal mining equipment and adjusted the coal m...