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- 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。
- Base on the back ground of Dafosi Mine project,the key strata theory and cusp catastrophe theory was applied to analyze the mine water inrush mechanism from roof. 以大佛寺煤矿工程为背景,运用关键层理论与尖点突变理论分析了采场顶板透水的发生机理,认为基岩关键层突发性破断失稳是顶板突水的诱因。
- 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。
- Secondly, it has the features of low foam, hard water resisting and readily rinsing, The cleaning strength redoubles. 第二，该种洗衣服使用时泡沫低，耐硬水，有容易漂洗的特点，洗净力倍增。
- It has good penetration and good water resistance. 具有高度的渗透力及良好的耐水性能。
- The key to the development of magnesite is to improve its water resistance. 指出菱镁发展的关键是改变相组分提高耐水性。
- 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。
- Secondly,it has the features of low foam,hard water resisting and readily rinsing,The cleaning strength redoubles. 第二，该种洗衣服使用时泡沫低，耐硬水，有容易漂洗的特点，洗净力倍增。
- Good weather and water resistance. 良好的耐侯性、耐水性。
- The mechanical model of key strata supported by coal pillar is set up according to the layout of coal pillars in the coalface of short wall mining. 根据短壁开采条件下保护煤柱的布设特点,建立由保护煤柱支承的关键层力学分析模型。
- The results show that the key strata control the emergence, development and space-time distribution of the overburden bed separations and fractures. 结果证明：覆岩关键层对离层及裂隙的产生、发展与时空分布起控制作用。
- 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。
- 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。
- The article takes water resisting floor as brittle rock mass,and thinks that water inrush from floor is caused by rock mass sliding along a fracture plane. 把隔水底板作为脆性岩体，认为底板突水是由于岩体沿断裂面发生滑动造成的。
- 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。
- Excellent water resistance and good anticorrosive property. 防水性能优异防腐蚀性好。
- Certina sport watches set the standard in water resistance. Certina运动表对防水性设置了标准。
- By use of FLAC, the mining model of a working face in some mine was built and the dynamic change process of load on key strata before primary broken during mining was researched. 摘要利用FLAC数值模拟软件建立矿区具体工作面的开采模型，模拟研究了随着煤层的开采关键层初次破断前载荷的动态变化过程。
- Excellent water resistance and anticorrosive properties. 优异的耐水性、和防腐性能。
