新安煤田底板奥陶系高承压含水层防治技术研究

Study on Prevention and Control Technology of High-Pressure Aquifer in Ordovician of Xin’an Coal Field

新安煤田主要受奥陶系底板高承压含水层影响,井田区域内遇断层导通奥灰含水层通道时,极易发生突水事故。通过底板破坏深度计算、突水系数计算,说明新安煤田主采煤层底板隔水层厚度承受不了奥陶系灰岩含水层水压,通过论证必需进行底板加固改造使含水层局部改造成隔水层,人为增加了底板奥灰强含水层隔水层的厚度,通过物探、钻探、注浆加固证明底板防治水注浆效果达标,有效避免了奥灰突水灾害的发生,为新安煤田底板奥陶系高承压含水层的防治提供了可靠的参考依据。

Xin’an coalfield is mainly affected by the high-pressure aquifer on the bottom plate of the Ordovician system.When faults lead to the passage of the Austrian ash aquifer in the well field area,it is prone to water intrusion accidents.The calculation of the depth of damage to the bottom plate and the calculation of the water penetration coefficient show that the thickness of the bottom layer of the main coal mining layer in Xin’an coalfield cannot withstand the pressure of the Otao-based limestone aquifer,and that the aquifer must be partially transformed into an isolation layer through the demonstration of the need for reinforcement and transformation of the bottom plate.We have increased the thickness of the aquifer in which the bottom ash is strong,and proved that the effect of preventing and controlling water grouting in the bottom plate is up to the standard through geophysical exploration,drilling,and grouting reinforcement,effectively avoiding the occurrence of water flooding in the bottom ash.It provides a reliable reference basis for the prevention and control of the Ordovician high confined aquifer in Xin’an coalfield floor.