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深孔松动预裂爆破增透技术在边抽边掘进工作面的应用 总被引:1,自引:0,他引:1
介绍了突出煤层掘进工作面瓦斯抽放方法试验,考察得出了巷帮长钻孔利用工作面深孔爆破技术来增大煤层透气性,抽放卸压瓦斯效果较为理想,大大减少了突出危险性,安全提高了煤巷单进。 相似文献
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根据赤峪煤矿近距离煤层群开采及瓦斯含量在10 m3/t以上等特殊条件,采用近距离煤层群底板拦截钻孔抽采回采工作面卸压瓦斯技术,利用在3号煤层的掘进巷道施工拦截钻孔,拦截钻孔抽采3号、4号煤层卸压瓦斯,降低回采过程中3号、4号煤层卸压瓦斯涌入2号煤层采空区的量。该技术通过在赤峪煤矿中央采区C1204工作面试验结果表明,底板拦截钻孔抽采回采工作面卸压瓦斯技术可替代底板抽采巷施工底板卸压钻孔,不仅有效的降低煤层瓦斯含量、压力,保证了工作面安全生产,同时节省了底板抽采巷因变形严重需要维修的费用。 相似文献
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针对逢春煤矿急倾斜煤层透气性低、预抽瓦斯时间长、防突掘进工作面局部防突措施工程量大、安全威胁大、生产效率低的问题,提出了利用俯伪斜自卸压综合抽放技术提高急倾斜单一严重突出煤层瓦斯抽放率,防治煤与瓦斯突出的技术。该技术在逢春煤矿S1862工作面的应用结果表明:台阶回采后对下部煤体的卸压保护范围达到7.60~9.97 m,工作面每个台阶推进速度在3~19m/班,平均推进度在7 m/班。因此自卸压综合抽放技术能有效地减弱煤与瓦斯突出危险性,并显著减少回采期间的瓦斯涌出量,通过伪倾斜正台阶采煤方法的自卸压原理可确保回采前方煤体不处于煤与瓦斯突出的危险状态。 相似文献
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深井煤层群首采层Y型通风工作面采空区卸压瓦斯抽采与综合治理研究 总被引:1,自引:0,他引:1
以朱集煤矿1111(1)工作面为例,针对深井高瓦斯低透气性煤层群首采层开采卸压瓦斯治理难题,将Y型通风工作面采空区瓦斯运移规律与采空区内部空隙储存卸压瓦斯的优势相结合,提出并实施了强化留巷墙体封闭和Y型通风工作面留巷段采空区卸压瓦斯抽采技术,结合地面钻井抽采采动上部卸压煤层瓦斯,实现了深井煤层群首采层工作面的安全高效回采。1111(1)工作面回采期间,绝对瓦斯涌出量最大72.39 m3/min,平均为43.64 m3/min,在工作面风量2290~2700 m3/min条件下,回风流瓦斯体积分数0.6%以下,平均瓦斯抽采量34.27 m3/min,其中埋管抽采瓦斯纯量平均为21.94 m3/min,占瓦斯抽采总量的64%,工作面回采期间瓦斯平均抽采率为78%,研究成果为今后类似深井煤层群首采层开采的卸压瓦斯抽采和治理提供技术指导。 相似文献
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工作面卸压区浅孔瓦斯抽放技术研究 总被引:15,自引:0,他引:15
为提高低透气性、高瓦斯煤层工作面的瓦斯预抽效果,对工作面瓦斯抽放新技术进行了研究.根据矿山压力分布规律和抽放钻孔的隔断控制作用,并利用工作面前方煤体受采动卸压后透气性显著提高这一特性,研究并试验了卸压区浅孔抽放技术,获得了该抽放技术的工艺参数.研究结果表明该抽放技术可行、系统可靠,能有效提高超前排放钻孔瓦斯排放效果、显著降低煤与瓦斯突出危险性,这对解决低透气性煤层在回采工作面生产过程中的瓦斯问题具有实际意义. 相似文献
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松软低透煤层掘进工作面瓦斯抽放技术研究 总被引:2,自引:1,他引:1
介绍了突出煤层掘进工作面瓦斯抽放方法试验,考察得出了巷帮抽放长钻孔合理参数布置,分析了深孔预裂爆破机理。利用工作面深孔爆破技术来增大煤层透气性,提高卸压瓦斯抽放效果,大大减少了掘进工作面突出危险性,提高了煤巷单进。提出了突出煤层掘进工作面瓦斯治理新观念。 相似文献
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New, more exact approximated solution to the direct problem of identifying a signal of a vertically oriented magnetic dipole
on a borehole axis is reported. This solution makes possible to process the data of the high-frequency induction logging isoparametric
sounding, including negative values of the measured phase difference. The new approximation enables taking into account the
variable borehole radius that is of special importance when a highly-conductive drilling mud is used. As the obtained expression
is explicit, it can be used for the quick data processing and for solving inverse problems of the borehole geophysics.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 3–9, July–August, 2006. 相似文献
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1. | A working and a rock mass around it may be defined by one dimensionless parameter λ≥0. This parameter predetermines the behavior of the rock mass with any changes of mine pressure and support resistance. |
2. | With 0≤λ<1 prediction of the behavior is clear: Reaction of the rock mass to any changes in mine pressure and support resistance will have a stable character. |
3. | If λ>1 then stability for the reaction is only retained up to a certain critical condition. Parameters of the critical condition depend on mine pressure, the degree of weakening at contacts between blocks, geometrical dimensions and elasticity moduli. With a changeover through the critical condition there is uncontrolled dynamic release of potential elastic energy for the rock mass. |
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I. D. Chashchin 《Journal of Mining Science》1991,27(4):337-343
Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy
Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 77–85, July–August, 1991. 相似文献
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Conclusions The deformation of the blocky mass around a working can be interpreted as displacement of the material in a convergent radial
channel with an aperture angle of 360°. A kinematic scheme permitting the formulation of the problem in statically determined
form (similar to the classical scheme for calculation of the pressure of the earth at a supporting wall) is constructed.
Axisymmetric solutions for different levels of block interaction on contact are given. Estimates of the carrying capacity
are obtained in the case of rigid-plastic contact between the block and in conditions of dry friction. It is shown that this
scheme admits of transition in the limit to the accurate solution of the Lame problem in the continuum formulation.
Cases in which increase in the relative slip between the blocks leads to decrease in the interaction force between them (weakening)
are considered. With slight weakening, the deformation is a stable process. If the weakening is greater than a critical level,
the solution becomes unstable, which indicates the uncontrollable release of stored elastic energy from the mass.
Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy
Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 7–15, November–December, 1990. 相似文献