The mathematical model with finite solution for bedding plane air-leakage is established, in which the air leakage intensity is regarded as attenuating follows proximately negative exponential law.

建立了层面漏风的定解数学模型，将地表漏风强度近似看作按负指数规律衰减。

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By nonlinear regression analysis the change law is found that with the increase of geostress the permeability coefficient will decrease with negative exponential trend.

然后通过回归分析，可以发现该地区渗透系数随地应力值的增大呈负指数递减的变化规律。

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It is shown that the grey exponential law can be obtained by means of accumulative generation for non-negative smooth discrete function.

本文论证了非负光滑离散函数累加生成后具有近似的指数规律，即灰指数律。

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