The traditional model is not fit for some actual gas reservoir such as channel sand, which can be described as a box-shaped drainage volume.
传统模型对于实际气藏中如河流相沉积为主的储层则不适用，这类气藏更适合建立箱式封闭地层模型。
In order to improve gas drainage volume, gas drainage on fully mechanized caving face and gas drainage pipeline network system are analyzed.
为了提高矿井瓦斯抽放量，重点分析了综放工作面的瓦斯抽放和瓦斯抽放管网系统方面。
Results show that the simulated drainage volume from the field ditch is extremely close to the observed value, and the relative error of annual drainage volume is only 0.4%;
结果表明：模拟的农沟排水量与试验观测值极为接近，年平均排水量误差仅为0.4%；
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