自燃煤矸石山隔离层空气阻隔性对时间的响应

为了制定合理的自燃煤矸石山覆土碾压方案与绿化时间,防止煤矸石复燃,本文通过室内试验,对土壤试样施加不同压差,探讨自燃煤矸石山隔离层空气阻隔性对时间的响应及隔离层含水率与空气渗流速度、渗透率的相关性。结果表明:随着时间推移,土壤试样的空气渗流速度与渗透率均呈二次函数式增大,从第6天起空气渗流速度开始超过临界渗流速度,隔离层阻隔性能降低;不同压差下空气渗透率均值从第19天起开始超过临界空气渗透率,隔离层阻隔效果降低;隔离层空气渗流速度与渗透率随含水率变化呈对数函数式变化,均随着含水率的降低而上升。

The response of air barrier property to time of the isolation layers of coal gangue piles

In order to make reasonable soil covering roller compaction scheme, green time and to prevent the resurgence of coal gangue for coal gangue piles with spontaneous combustion. In this paper, we have applied different pressure variations to the soil sample and discussed the response of the air barrier property to the time of the isolated layers of coal gangue piles through laboratory tests. The results show that the air permeation speed and permeability of soil samples increased in a quadratic function with time. From the sixth day, the air permeation speed begins to exceed the critical seepage velocity, the air barrier property of the isolation layers decrease. From the nineteenth day the mean air permeability begins to exceed the critical air permeability, and the air barrier property of the isolation layers decreases. The air permeation speed and permeability in isolation layers vary in logarithmic manner with the change of water content, and both increasing with the decrease of water content.