Top-coal deformation control of gob-side entry with narrow pillars and its application for fully mechanized mining face

A mechanical model to control the top-coal deformation is established in accordance with the structural characters of the gob-side entry surrounding rock for the fully-mechanic top-coal caving; the analytical solution of top coal roof-sag curve is deduced with Winkler elastic foundation beam model. By means of a calculating and analytic program, the top coal roof-sag values are calculated under the conditions of different supporting intensities, widths of narrow pillars and stiffness of top coal; meanwhile, the relationship between the roof-sag values and supporting intensity, width of narrow pillars and stiffness of top coal is analyzed as well. With the actual situation of the gob-side entry taken into consideration, the parameters of top-coal control are determined and a supporting plan is proposed for the top-coal control,which is proved to be reliable and effective by on-site verification. Some theoretical guidance and advice are put forward for the top-coal deformation control in gob-side entry for fully mechanized top-coal caving face.     

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.     

综放工作面矿压显现规律研究

通过对平顶山煤业(集团)公司十三矿综放工作面矿山压力及支架的受力特点进行综合分析和研究,探讨了该工作面的矿压显现规律,对于了解综放工作面的矿压规律、合理确定支架的工作阻力和结构型式有一定的借鉴作用,对于加强综放工作面控制、推广应用综放技术有着重要的意义.     

综放工作面矿压显现规律研究

通过对平顶山煤业 (集团 )公司十三矿综放工作面矿山压力及支架的受力特点进行综合分析和研究 ,探讨了该工作面的矿压显现规律 ,对于了解综放工作面的矿压规律、合理确定支架的工作阻力和结构型式有一定的借鉴作用 ,对于加强综放工作面控制、推广应用综放技术有着重要的意义     

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.     

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...     

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。     

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.     

李村煤矿综采设备配套选型研究

综合机械化采煤使用的成套设备,主要包括采煤机、刮板输送机、液压支架以及转载机、破碎机、带式输送机和乳化液泵站等.这些设备并不是孤立的单机,而是具有很高的配套要求和很强的可靠性要求.依据李村煤矿的地质情况和煤层赋存状况的特点,应用工程类比的方法,对工作面的综采设备进行了分析和计算,并且在使综采设备间满足结构上相互联系,功能上相互匹配,运动上相互协调的配套前提下,确定了李村煤矿的综采设备.     

综放支架部分参数对顶煤回收率的影响

利用以义马煤业集团耿村矿开采(2 3)煤所用的ZFSBa—4400A—18.2/28型低位放顶煤支架为原型而制造出的可变顶梁长度、可变掩护梁角度、可变掩护梁外表面摩擦系数的模型支架,在进行相似模拟实验的基础上,运用方差分析的方法论证了综放支架等参数对综放顶煤回收率的影响;利用曲线回归的方法,得出了以上各参数与综放顶煤回收率的定量关系;在此基础上,结合现场实测,进一步对综放支架参数对综放顶煤回收率影响的机理进行了分析与研究,得出适合义马煤业集团耿村矿(2 3)煤开采的以上各支架参数.     

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.     

综放开采回采巷道喷射砼防火技术研究

根据煤层巷道自然发火的特点 ,研究了喷射砼在易自燃发火煤层综放开采回采巷道防火原理 ,并在现场进行了工业性试验 .实践证明 :喷射砼可以有效地预防巷道自燃火灾 ,这一技术在义马矿区得到了推广应用     

综放开采回采巷道喷射砼防火技术研究

根据煤层巷道自然发火的特点,研究了喷射砼在易自燃发火煤层综放开采回采巷道防火原理,并在现场进行了工业性试验.实践证明喷射砼可以有效地预防巷道自燃火灾,这一技术在义马矿区得到了推广应用.     

基于L-R模糊数的综放工作面瓦斯爆燃火灾事故树分析

瓦斯爆燃是矿井火灾的诱发因素之一,由于瓦斯特殊的物理化学性质和赋存条件导致其爆燃形式与煤自燃有许多不同之处.从瓦斯爆燃的三要素入手,结合综放面瓦斯爆燃事故的特点,建立了基于瓦斯爆燃的火灾事故树,在基本事件概率不清楚的情况下,应用模糊数学理论将基本事件概率看作L-R模糊数,对事故树分析得出各个事件的概率值,为矿井防火提供更加科学的参考依据.     

基于L-R模糊数的综放工作面瓦斯爆燃火灾事故树分析

瓦斯爆燃是矿井火灾的诱发因素之一,由于瓦斯特殊的物理化学性质和赋存条件导致其爆燃形式与煤自燃有许多不同之处.从瓦斯爆燃的三要素入手,结合综放面瓦斯爆燃事故的特点,建立了基于瓦斯爆燃的火灾事故树,在基本事件概率不清楚的情况下,应用模糊数学理论将基本事件概率看作L-R模糊数,对事故树分析得出各个事件的概率值,为矿井防火提供更加科学的参考依据.     

Development of 3D top coal caving angle model for fully mechanized extra-thick coal seam miningOA

During high-intensity, fully mechanized mining of extra-thick coal seam, the top coal would cave to a certain 3D form. Based on the data collected during drilling, a 3D model of top coal caving surface space was established to determine the relationship between the location of the stope roof and the caving surface,enabling the mathematical computation of the top caving angle(φ). The drilling method was employed to measure the top caving angle on two extra-thick fully mechanized coal caving faces...     

综放支架部分参数对顶煤回收率的影响

利用以义马煤业集团耿村矿开采(2-3)煤所用的ZFSBa-4400A-18.2/28型低位放顶煤支架为原型而制造出的可变顶梁长度、可变掩护梁角度、可变掩护梁外表面摩擦系数的模型支架,在进行相似模拟实验的基础上,运用方差分析的方法论证了综放支架等参数对综放顶煤回收率的影响;利用曲线回归的方法,得出了以上各参数与综放顶煤回收率的定量关系;在此基础上,结合现场实测,进一步对综放支架参数对综放顶煤回收率影响的机理进行了分析与研究,得出适合义马煤业集团耿村矿(2-3)煤开采的以上各支架参数.     

大倾角大采高综采工作面高产高效实践

淮南矿业集团潘北矿1121（3）工作面,其煤层赋存状况是典型的大倾角、多断层、＂三软＂、高瓦斯、复杂地质条件。本文就综采技术在大倾角煤层的应用过程中所涉及到的问题进行分析并加以解决,实现了大倾角综采工作面的高产高效。     

综采放顶煤合理放煤参数的确定

依据椭球体放煤理论,研究了煤层地质赋存条件与放煤参数之间的关系,分析总结了放煤步距、采放比、放煤间距各参数对放出体的影响,从而能够比较合理地确定放煤工艺参数及选用设备;对常用的放煤方式提出了一些有意义的见解,有针对性地为解决实际问题提供理论依据.