方程求解采用了特征边界条件。
Characteristic boundary conditions based on the eigensystem of the preconditioned equations are employed.
针对模型的特点及其边界条件用差分法分别进行了数值计算，结果表明陷落柱氡气场的空间形态分布特征。
The numerical computations have been made using difference method for difference characteristics and boundary conditions. The computation results show the state features of radon field in space.
同时根据溶洞顶板的特征和边界条件，将其简化为椭圆形和圆形顶板两种力学模型。
According to the characteristic and the boundary conditions, the cavity roof is respectively simplified as two kinds of mechanical models (round model and ellipse model).
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