顾北煤矿岩溶地下水动态特征及放水试验设计

Dynamic Characteristics of Karst Groundwater in Gubei Coal Mine and Design of Drainage Test

摘要: 随着煤层向深部开采，煤层底板岩溶水害成为威胁矿井安全生产的主要因素。本文以顾北煤矿中央A组煤采区C₃I组煤层底板灰岩水为对象，通过井下放水试验，结合矿井水文地质条件，分析各含水层地下水动态变化特征，结果表明：A组煤层底板岩溶水为高矿化度Cl-Na型水；岩溶水温低于地温，推测无深部灰岩水补给；寒武系和奥陶系灰岩含水层通过露头区风化带与太灰含水层产生一定水力联系；中央采区与周围采区之间水力联系较弱，为一相对独立水文地质单元。在以上基础上，设计了中央采区放水试验，为A组煤层安全开采提供依据。

Abstract: With the deep mining of coal seams, karst water damage on the coal seam floor has become the main factor threatening the safety production of mines. This article takes the limestone water in the coal seam floor of Group C₃I in the central A coal mining area of Gubei Coal Mine as the object. Through underground water discharge tests and combined with hydrogeological conditions of the mine, the dynamic changes of groundwater in each aquifer are analyzed. The results show that the karst water in the coal seam floor of Group A is of high mineralization Cl-Na type; The karst water temperature is lower than the ground temperature, indicating that there is no deep limestone water supply; The Cambrian and Ordovician limestone aquifers have a certain hydraulic connection with the Taiyuan limestone aquifer through the weathering zone of the outcrop area; The hydraulic connection between the central mining area and the surrounding mining area is weak, and it is a relatively independent hydrogeological unit. On the basis of the above, a central mining area drainage test was designed to provide a basis for the safe mining of Group A coal seams.