内蒙古上海庙矿区新上海一号煤矿发生国内首次也是目前唯一的侏罗系煤层开采底板宝塔山砂岩突水淹井事故；开展了侏罗系煤层开采底板强富水宝塔山砂岩突水危险性评价方法和防控技术的研究工作。首先，明确了“11·25”事故的突水水源为侏罗系延安组下部的宝塔山砂岩含水层，且煤层与底板宝塔山砂岩之间隔水层具有强度低、软化系数小、胶结性差的特点，属地质软岩。其次，以“含水层厚度、含水层富水性、含水层渗透性、含水层水压力及18煤底板隔水层有效厚度”为主要指标建立突水评价体系，将宝塔山砂岩含水层突水危险性分区被划分为安全区（32.21%）、威胁区（37.53%）及危险区（30.26%）三种类型，并通过实例验证了评价模型的准确性。最后，结合底板隔水层工程地质特性，分析采用“断层注浆形成局部限制边界+群孔疏降”的方法防控宝塔山砂岩突水。设定“疏放水开始至1 号钻场退出疏放水工作、2 号、3 号和4 号钻场持续进行疏放水工作至3 号钻场退出、2 号和4 号钻场持续进行疏放水工作至模型补排平衡”的疏降方案。依据规范得出注浆后最大帷幕渗透系数为2×10⁻² m/d，当断层注浆后帷幕渗透系数为2×10⁻²～2×10⁻⁸ m/d时，疏放水量为402万~347.8万m³，安全区占矿区的比例为43.34%～67.37%。结合注浆成本、疏放水量和安全性，帷幕渗透系数为2×10⁻⁴ m/d时即可有效保证矿井安全生产和技术经济效益。断层注浆局部限制边界+疏放水联合技可有效防控宝塔山砂岩水害，研究工作对我国西部侏罗纪煤田开发底板水防治具有重要意义和工程实践价值。

The first and currently only Jurassic coal seam mining floor Baotashan sandstone water inrush and well flooding accident occurred in the New Shanghai No. 1 Coal Mine in Shanghai Miao Mining Area, Inner Mongolia. This paper researched the water inrush risk assessment method and prevention and control technology of the Baotashan sandstone in the Jurassic coal seam mining floor, which is highly water-rich. Firstly, it is clear that the water inrush source of the "11.25" accident is the Baotashan sandstone aquifer in the lower part of the Jurassic Yan'an formation, and the water barrier between the coal seam and the floor Baotashan sandstone has the characteristics of low strength, low softening coefficient and poor cementation, so it belongs to geological soft rock. Secondly, a water inrush evaluation system was established using “aquifer thickness, aquifer water richness, aquifer permeability, aquifer water pressure and the effective thickness of the 18 coal floor aquifer” as the main indicators, and the water inrush of the Baotashan sandstone aquifer was the dangerous zones are divided into three types: safety zone (32.21%), threat zone (37.53%) and dangerous zone (30.26%), and the accuracy of the evaluation model was verified through the “11.25” water inrush accident. Finally, combined with the engineering geological characteristics of the floor aquifer, the method of “fault grouting to form a local restricted boundary+group hole water release” was used to prevent and control Baotashan sandstone water inrush. It was set that “Water drainage begins until drilling site #1 exits work, the 2#, 3#, and 4# drilling fields continue the water drainage work until 3# exits work, and the 2# and 4# drilling sites continue to drain water until the model is replenished and balanced.” According to the specification, the maximum curtain permeability coefficient after grouting is 2×10⁻² m/d, When the curtain permeability coefficient after fault grouting is 2×10⁻² − −2×10⁻⁸ m/d, the drainage volume is 4.02×10⁻⁴ m³ − 3.478×10⁻⁴ m³. The proportion of safe areas in the mining area is 43.34%−67.37% respectively. Combining the grouting cost, drained water volume and safe area, when the curtain permeability coefficient is not greater than 2×10⁻⁴ m/d, can effectively ensure the safety and technical and economic benefits of the mine. The combined technology of fault grouting local restriction boundary+water drainage can effectively prevent and control sandstone water damage in Baotashan. The research work in this paper is of great significance and engineering practice value for the prevention and control of floor water in the Jurassic Coalfield development in western China.