测氡法-磁法在云南吕合煤田火区勘察中的应用

Application of Rn Measurement and Magnetic Prospecting to Reconnaissance of Coal Fire in South-west China—Lvhe Coal Fire Taken as a Case

测氡法是煤田火区勘察的重要手段,在我国北方煤田火区中有许多成功的案例。云南吕合煤田火区具有氡背景值高、地表覆盖厚的特点,应用测氡法时,煤田火区与采空区难以区别。而单一的磁法勘察,受地表铁磁性物质影响大。通过与磁法相结合的方式,有效解决了采空区的干扰,准确圈定了地下煤田火区的范围。这为我国西南地区煤田火区勘察,提供了借鉴经验,具有一定的工程应用参考价值。

As an important method for coal fire reconnaissance, the Rn measurement has been successfully applied in the coal fires of the northern China. However, it is hard to distinguish the coal fires from the goafswhen this method is used in the coal fires of Lvhe coal mine area, Yunnan, with high Rn background andthick coverage. And the result of magnetic prospecting is affected by surface ferromagnetic materials. By theassistance of magnetic prospecting, the interference of goaf has been eliminated, and the boundary of coalfires has been identified accurately. It shows that the combined method can be applied in the coal fire reconnaissance in South-west China and is valuable in the engineering application.