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- The idea of key stratum pressure is put forward, and the ground pressure is mainly influenced by the breakage of key . 提出主关键层来压的新概念,指出回采工作面矿压显现程度主要受主关键层破断的影响。
- The caving of thick and strong roof stratum,key stratum,causes tremendous rock pressure in mine. 采场上覆岩层中的厚硬岩层,即厚硬关键层,其冒落会造成剧烈的矿山压力显现。
- According to the model,applying the cusp catastrophic theory the mechanics mechanism of water inrush is analyzed from key stratum of floor. 当满足关键层失稳的充要力学条件时,承压水底板有可能发生失稳突水。
- Satisfying the sufficient mechanics condition for key stratum instability, a water inrush is likely to happen in the floor. 当满足关键层失稳的充要力学条件时,承压水底板有可能发生失稳突水。
- Based on the structural characteristics of floor in the longwall face, the structural model of the key stratum (KS) in floor is established. 根据采场底板岩体结构特征,建立了底板岩体的关键层(KS)结构模型。
- Based on the analyzing of parameter about combinatorial key stratum, the formulae of calculating the roof weighting step is given in this article. 在分析组合关键层有关参数的基础上,推导出了组合关键层初次来压步距和周期来压步距的计算公式。
- Studied the shock bump caused by the key stratum movement in Huafeng Colliery using the microseism locating and monitoring technology. 摘要采用微地震定位监测技术对华丰煤矿关键层运动诱发矿震进行了研究。
- The main key stratum that is made up of the hard stratum covering over the coal seam has a great influence on rock burst. 摘要煤层上覆坚硬厚层岩层组成的主关键层对冲击矿压的发生具有强烈的影响。
- Based on the 3D rock cracking imaging, obtained the conclusions: key stratum can be classified according to the special attribution of the microseismic cracking events. 根据岩体在三维空间的破裂成像,得出:可以依据微震破裂事件的空间分布对关键层进行划分;
- The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived. 利用机动法确定了老顶岩板初次来压时载荷的上限值和塑铰线的位置,得到了顶板岩体关键层的最小破断跨距。
- The study indicates that according to the formulae of combinatorial key stratum, coal roof weighting step in the 1203 face in Da-liu-ta mining is co the observation value. 结果表明,以该修正的组合关键层破断距公式计算的大柳塔1203工作面的初次来压步距与实测非常接近。
- The Ion of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived. 利用机动法确定了老顶岩板初次来压时载荷的上限值和塑铰线的位置,得到了顶板岩体关键层的最小破断跨距。
- It is pointed that the thick unconsolidated layers above roof have effect on post-buckling behaviors of key stratum, the equilibrium path of roof is unstable from breaking to final subsidence. 研究发现,顶板上覆厚松散沙层对关键层的后屈曲性态有影响;顶板从破断至极限下沉其平衡路径不稳定。
- Based on the structural characteristics of single roof key stratum in shallow seam longwall face, the structural model of the roof key stratum in a state of plasticity is established. 摘要针对浅埋煤层单一关键层长壁开采时顶板岩体结构的破断特征,建立了顶板岩体关键层塑性状态下的结构模型。
- The occurrence of rock burst not only need a great deal of elastic energy gathering in the coal seam and the around rock stratum, but also the external energy released by the main key stratum break. 冲击矿压的发生需要煤层及其周围岩层中聚集大量的弹性能外,还需要主关键层破裂等释放的外部能量;
- Therefore, the method of grouting bed separation can be adopted to ensure the long-term stability of the main key stratum, and eliminate the rock burst danger induced by main key stratum break. 因此,可采用覆岩离层注浆等技术手段保证覆岩主关键层的长期稳定,消除主关键层岩破断引发的冲击矿压危险。
- The collapsing load of the key stratum is obtained by adopting the plastical limit analysis method structure.Based on the collapsing load,the posotion of key stratum can be estimated approximatively. 并且采用结构塑性极限分析方法解析得出了关键层失稳时的极限荷载,依据此极限荷载可以近似判断出覆岩中关键层的位置。
- Theoretical analysis, simulation experiment and engineering exploration are adopted to study the impact of the location of primary key stratum (PKS) on the evolution range of water flowing fracture. 摘要采用理论分析、模拟实验和工程探测等方法,就覆岩主关键层位置对导水裂隙带高度的影响进行深入研究。
- A great deal of analysis and research indicates that the crack damage is controlled by the key stratum in the overburden strata. 大量研究表明,这种裂缝损害受覆岩中关键层的控制。
- Cantilever beam of key strata breaks and caves into blocks,which is periodic weighting of mining face. 关键层悬臂梁破断垮落成承压砌块,其垮落及沿架后切落,形成工作面周期来压。
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