A model and its formula of 3-D 10-node mapped infinite elementfor intercalations in rock engineering are proposed. In comparison with the ordinary finite element simulation, with this model the time for data preparation and CPU time are effectively reduced, and higher computational accuracy is achieved by taking a smaller area into consideration. This model also features clear concept, simple programming and suitable for computation on PCs.%提出三维10结点映射夹层无限元模型及相应算式。在半无限区域的岩土工程中，用此单元与夹层有限单元耦合系统模拟无限区域的软弱夹层，与常规的有限元法相比，取较小的计算范围，就能得到较高的计算精度。采用此模型，将节省大量的数据准备工作量和机时，具有显著的经济性。此模型还具有概念清晰，编制程序简单，易于在微机上实现的特点。通过赋存软弱夹层的半无限地基在法向荷载作用下的算例分析，表明此模型具有的优越性。
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