通过将裂隙之间的交线看作为内部边界，推导了多裂隙相交时的边界单元法公式。

Supposing that the intersection of multi-group fractures is treated as the internal boundary, a boundary Element Method of fracture network seepage flow is obtained.

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给水系统可靠度的预测，一般可用解析法依据多单元可靠度和其间的逻辑联系求得。

The reliability of a water supply system is usually predicted by analytics basing on the reliability of every unit and logical connections among them.

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空间协同分析时，采用超元法（每个单元由多根杆组成）计算等效柱的侧移刚度矩阵，自由度成倍减少。

The method is applied to calculate lateral stiffness matrix in space cooperating analysis and the the degree of freedom can be greatly decreased.

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