Bibliographic Details
| Title: |
淮南煤田下组煤底板岩溶含水层系统重构及岩溶水害分源防治技术. |
| Alternate Title: |
Reconstruction of karst aquifer system beneath lower coal group and source-specific prevention and control technology for karst water disaster in Huainan Coalfield. |
| Authors: |
谢治刚1 406535191@qq.com, 韩锋1, 陈善成1, 丁海1, 孙贵2, 许光泉3 |
| Source: |
Coal Science & Technology (0253-2336). Apr2026, Vol. 54 Issue 4, p308-319. 12p. |
| Subject Terms: |
*Karst hydrology, *Hydrogeology, *Coal mining, *Aquitards, *Emergency management, *Coalfields |
| Geographic Terms: |
China |
| Abstract (English): |
The Huainan Coalfield boasts abundant coal resources, with an annual coal production of 80 million tons in 2022, making it one of China's major coal-producing regions in eastern China. The lower coal group in the Huainan Coalfield is characterized by large thickness, high coal quality, abundant reserves, and favorable occurrence conditions. However, the limestone beneath the lower coal group exhibits significant thickness, high confining pressure, strong water yield property, and uneven karst development, posing critical threats to mining operations. Based on the hydrogeological characteristics beneath the lower coal group, this study re-recognizes and reconstructs the karst aquifer system and proposes "source-specific prevention and control" technologies for karst water disasters. The research findings are as follows: The karst aquifer system beneath the lower coal group in the Huainan Coalfield, from top to bottom, consists of C3Ⅰ aquifer, upper aquiclude of Taiyuan Formation, C3Ⅱ aquifer, lower aquiclude of Taiyuan Formation, C3Ⅲ aquifer, Benxi Formation aquiclude, and Ordovician limestone aquifer. Among them, the upper aquiclude of Taiyuan Formation and the Benxi Formation aquiclude are characterized by limited thickness and moderate impermeability, while the lower aquiclude of Taiyuan Formation exhibit significant thickness, superior impermeability and high compressive strength. The hydraulic connection between C3I and C3II aquifers is close, while the hydraulic connection between C3III and Ordovician karst aquifers is close. Based on the impermeability of aquiclude and the water yield property, permeability, drainability, and hydraulic connection of the aquifer, the karst aquifer system beneath the lower coal group is reconstructed to form a ternary karst aquifer system consisting of the C3Ⅰ—C3Ⅱ aquifer, the lower aquiclude of Taiyuan Formation, and the C3Ⅲ—Ordovician aquifer. The C3Ⅰ—C3Ⅱ aquifer is drainable, and dewatering and depressurization serves as an effective method for prevention and control karst water disaster, whereas the C3Ⅲ—Ordovician aquifer, characterized by abundant recharge and low drainability, requires ground regional treatment engineering for karst water disaster prevention and control. The C3Ⅱ limestone serves as a favorable stratum for ground regional treatment engineering to prevent and control karst water disasters in the C3Ⅲ—Ordovician aquifer. By investigating and treating the vertical water-conducting channels within the C3Ⅱ limestone, the water-inrush pathways from the C3Ⅲ—Ordovician aquifer can be effectively blocked, thereby decoupling the engineering treatment stratum (C3Ⅱ) from the prevention target stratum (C3Ⅲ—Ordovician). Based on the barrier effect of the lower aquiclude of Taiyuan Formation, a "source-specific prevention and control" system for karst water disasters is established: Using the lower aquiclude of Taiyuan Formation as an isolation stratum, dewatering and depressurization is applied to the upper composite aquifer (C3Ⅰ—C3Ⅱ aquifer), while ground regional treatment engineering is prioritized for the lower composite aquifer (C3Ⅲ—Ordovician aquifer). [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
淮南煤田煤炭资源丰富, 2022 年煤炭年产量达 8000 万 t, 是我国东部主要产煤省份之一。淮南煤田下组煤厚度大、煤质好、资源储量高、赋存条件优良, 而下组煤底板灰岩具有厚度大、高承压、强富水、岩溶发育不均一等特征, 威胁下组煤层开采。以煤底板水文地质特征为基础, 对岩溶含水层系统进行再认识及重构, 提出岩溶水害分源防治技术。研究表明: 淮南煤田下组煤底板岩溶含水层系统自上而下依次为 C3Ⅰ组含水层、太原组上部隔水层、 C3Ⅱ组含水层、太原组下部隔水层、 C3Ⅲ组含水层、本溪组隔水层及奥灰含水层, 其中, 太原组上部隔水层与本溪组隔水层厚度较小且隔水性较弱, 而太原组下部隔水层厚度大、隔水性良好、抗压强度高, C3Ⅰ与 C3Ⅱ组含水层水力联系密切, 而 C3Ⅲ组与奥灰含水层水力联系较密切。基于隔水层隔水性及含水层富水性、导水性、可疏放性、水力联系程度等指标对下组煤底板岩溶含水层系统进行重构, 形成 C3Ⅰ— C3Ⅱ组含水层、太原组下部隔水层与 C3Ⅲ组—奥灰含水层的三元岩溶含水层系统, 其中 C3Ⅰ— C3Ⅱ组含水层具有可疏放性, 可采用疏水降压方法实现岩溶水害防治。 C3Ⅲ组—奥灰含水层补给充沛, 不具备疏放可行性, 需要采用地面区域治理工程防治岩溶水害。 C3Ⅱ组灰岩是实施地面区域探查治理工程防治 C3Ⅲ组—奥灰岩溶水害的有利层位, 通过探查治理 C3Ⅱ组灰岩垂向导水通道, 阻隔 C3Ⅲ组—奥灰岩溶水的突涌路径, 可实现工程治理层 ( C3Ⅱ组) 与防治目标层 ( C3Ⅲ组—奥灰) 的解耦。基于太原组下部隔水层的阻隔效应, 构建岩溶水害"分源防治"技术体系, 即以太原组下部隔水层为隔离层, 上部复合含水层 ( C3Ⅰ— C3Ⅱ组含水层) 以疏水降压为主导, 下部复合含水层 ( C3Ⅲ组—奥灰含水层) 重点实施地面区域探查治理工程。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
