Development and Application of 'Down Three Zones' Theory on Mining Safety Evaluation above Confined Water

机译：承压水上采矿安全评价的“三防”理论的发展与应用

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With twenty years' research and production practice, the "Down Three Zones" theory has been playing an important role in the safety mining evaluation of coal seams above high-pressure aquifers and the prediction of the water inrush from coal seam floor. On the basis of former studies, the concept and origination, the development and application and the determination method of the "Down Three Zones" are summarized. The forming mechanism of the three zones under floor is further analyzed through theories of rock cracking mechanics; the definition of protecting zones in traditional three zones theory is newly divided and the "Down Three Zones" theory is systematically discussed. This paper aims to promote the intensive comprehension and extensive application of the theory, and thus to guide the mining activities above confined water.

机译：经过二十多年的研究和生产实践，“三下”理论在高压含水层以上煤层的安全开采评价和煤层底板突水的预测中一直发挥着重要作用。在前人研究的基础上，总结了“下三区”的概念，起源，发展应用及确定方法。通过岩石开裂力学理论进一步分析了底板下三个区域的形成机理。对传统三区理论中保护区的定义进行了新的划分，系统地讨论了“下三区”理论。本文旨在促进对该理论的深入理解和广泛应用，从而指导密闭水域以上的采矿活动。

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《The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集》|2008年|242-246|共5页
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ZHANG Wenquan; HU Yanhui; REN Yanghui; SUN Ming; YU Zhipeng;
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"Down Three Zones" theory; permeable failure depth in the coal seam floor; the rise of confined water; protection strata; water-impedance coefficient; water inrush from coal seam floor;

机译：“三下”理论;煤层底板透水破坏深度;承压水上升;保护层;阻水系数;煤层底板突水;

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Development and Application of 'Down Three Zones' Theory on Mining Safety Evaluation above Confined Water

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