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- sand prevent coal pillar 防砂煤柱
- The paper also gives an introduction into the impermeability of water sealing layers such as clay layers and the ways to leave water prevention coal pillars or ... 采用这些研究成果,淮南和潘谢矿区分别提高了开采上限,增加了可利用储量。
- Secondly, simulation elicits wall rock transmogrification under the different coal pillar and different stress. 其次模拟研究分析了留设煤柱宽度不同时以及地应力大小不一时沿空巷道围岩变形情况，得到了一些认识；
- The coal pillar has mode-soft behaviour, so it is possible to estimate the destabilization. 煤柱失稳还具有模态软化特性，可以对失稳的可能性进行佑计。
- The roof rock was assumed in the elastic state,established the mechanical model of coal pillar and roof system. 假设顶板岩层处于弹性工作状态情况下,建立了煤柱-顶板系统的力学模型。
- The results indicate that the width of coal pillar has a great influence on the stress distribution of the gob-side entry. 研究表明：留设煤柱的宽度对孤岛面沿空巷道的应力分布有较大影响；
- Field applications show that this technique can effectively prevent coal beds sloughing and decrease hole problems and drilling accidents. 现场应用表明,该技术能有效地防止煤层坍塌,减少井下复杂情况及事故。
- In the plastic limit analysis,the wrinkler's plate is smartly analyzed in yield-line theory to get the critical compression strength of the coal pillar. 在分析过程中,利用机动法对温克尔地基板(弹簧支撑板)进行了塑性极限分析,得出了煤柱抗压强度的临界值。
- The authors have analysed the causes of coal and gas outburst accidents happened in the past years and put forward some countermeasures to prevent coal and gas outburst. 分析了坪湖煤矿历年来发生的煤与瓦斯突出事故的原因,有利于今后坪湖矿采取针对性的措施防治煤与瓦斯突出。
- The results show that the coal pillar destabilization has catastrophe and gradualness paths, which correspondingly cause the violent destroy and the gradualness "weak" destroy. 结果表明：煤柱失稳具有突变、缓慢2条路径，相应地形成了煤柱失稳的突然猛烈破坏和较缓慢的“瘫软”破坏；
- The composition, function and application situation of four equipment positioning interlocking to prevent coal mixing in coal blending system is desc ribed in this paper. 介绍了配煤四车定位连锁防混煤系统的组成、功能及应用情况。
- When the destabilization of the coal pillar occurred, it needs much more strength of coal pillar to restore to the steady state than that when destroying. 煤柱一旦失稳，如要使其恢复到稳定状态，需要的煤柱强度要比煤柱破坏时的强度大的多；
- Analyzing the reason and apprehending the mechanism of sand production are the critical technique for sand prevention. 防砂工艺技术的关键在于正确分析油层出砂的原因,并判断油层出砂机制。
- The formula of necessary and sufficient condition for instability and failure of strip coal pillar along strike is obtained according to the cusp catastrophi... 并根据模型对走向条带煤柱破坏失稳的机理进行了分析。为条带开采煤柱的稳定性及破坏失稳研究提供了新的理论方法。
- Reasonable aperture of sand prevention meshwork is important if liner in sand prevention of horizontal well is adopted. 水平井若采用筛管防砂,合理的防砂网孔径的确定尤为重要。
- Also a comparison of the plastic status of the coal pillar is made respectively considering uncoupled and coupled situations, and the deformation and failure laws are researched. 结果表明：两种情况下的塑性区均呈现“马鞍”形状，这与以往的大量实测结果相一致。
- The stability of coal pillar of the short-wall mining was analyzed systemically by numerical simulation with the rock failure process analysis software (RFPA2D). 采用岩石破裂过程分析软件RFPA2D系统，对短壁机械化开采的煤柱稳定性进行数值计算与分析。
- Through analysing and studying on the causes of sand plug and scaling for electric submersible pump,the sand prevention and scale control electr... 经室内试验后在现场部分含砂结垢严重的油井中应用并获得成功。
- Dividing partition coal pillars and region coal pillars, and selecting parameter are key to prevent disaster. 区分隔离煤柱和区内煤柱,选择合理开采参数,是防止灾变的关键。
- Through continual research, improvement and perfection of sand prevention by filling in deep formation by laser caved griddle tube, there are a series of mat... 通过对激光割缝筛管地层深部充填防砂技术的不断研究、改进和完善,现已形成较成熟的防砂配套工艺。
