Horizontal directional drilling technology was used to prevent and control water inrushes from the Ordovician limestone strata at the Sangshuping coal mine in the Hancheng mining area by drilling and grouting the contact zone along the top of the aquifer. Considering the hydraulic conductivity of the floor failure zone, we used the modified water inrush coefficient method to estimate the critical thickness of Ordovician limestone that had to be grouted. We carried out directional borehole exploration from both ends of the mining face and combined the results with borehole water pressure tests to determine appropriate grouting techniques and parameters; we then analysed the effectiveness of the grouting. 3-D seismic and ground transient electromagnetics (TEM) were used to detect areas of anomalous resistivity and geologic structure in the mining area, while DC and TEM geophysics were used to detect water-bearing areas ahead of the roadway. After the roadway was developed, TEM, DC resistivity sounding, and audio-magnetotellurics were used to explore water-bearing areas under the roadway and the mine floor. Radio waves were used to detect the structure of the mining face and changes in coal thickness. Finally, based on the results of exploration, an inspection program was devised using conventional boreholes supplemented by directional boreholes to comprehensively evaluate the feasibility of mining under pressure. The study showed that the failure depth of the floor was 15 m and that the top of the Ordovician limestone was no longer water-bearing and was now a relative aquitard. The water inrush coefficient was reduced to less than 0.073 MPa/m, which will ensure safe mining and extend the lower limit of safe mining in the area. This provides a technical reference for prevention and control of Ordovician limestone water disasters in similar coal mines.

利用水平定向钻井技术，通过对沿含水层顶部的接触区进行钻探和灌浆，来预防和控制韩城矿区桑树坪煤矿奥陶系石灰岩地层的突水。考虑到地板破坏带的水力传导率，我们使用了改进的突水系数法来估算必须灌浆的奥陶纪石灰岩的临界厚度。我们从开采面的两端进行定向井眼勘探，并将结果与​​井眼水压试验结合起来，以确定合适的灌浆技术和参数。然后，我们分析了灌浆的有效性。3-D地震和地面瞬变电磁（TEM）用于检测矿区的反常电阻率和地质结构区域，而DC和TEM地球物理学用于检测巷道前的含水区域。巷道开发完成后，使用TEM，直流电阻率测深和电磁大地电磁技术勘探巷道和矿层下面的含水区域。无线电波被用来检测采煤工作面的结构和煤层厚度的变化。最后，根据勘探结果，设计了一个检查程序，该程序使用常规井眼和定向井眼进行补充，以全面评估在压力下开采的可行性。研究表明，底板的破坏深度为15 m，奥陶纪石灰岩的顶部不再含水，而现在是相对的aquitard。突水系数降低到小于0.073 MPa / m，这将确保安全开采并扩大该地区安全开采的下限。这为预防和控制类似煤矿中的奥陶系石灰石水灾提供了技术参考。