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计算各向异性介质渗流一直是一个重要研究课题，边界元法由于只在边界划分单元，可降低一维进行计算等特点，且适合于解决无限域问题，在渗流研究中具有一定的独特优点，尤其在处理含有源（漏）问题时。本文用边界元法对各向异性介质非定常渗流问题进行数值方法研究与数值计算。对非定常问题在对时间推进时要涉及到区域积分的计算，本文选取适当的坐标函数，再次应用Ｇｒｅｅｎ公式将区域积分转化为边界积分，因而做到唯边界计算，充分发挥了边界元法的优势。本文用Ｆｏｒｔｒａｎ语言编写了边界元法计算程序ＢＴＡＭ程序，并进行了若干算例计算。
Calculating the seepage of anisotropic media is an important research topic all the time. The boundary element method can reduce the one-dimensional calculation and so on because it only divides the boundary. It is suitable for solving infinite domain problems and has certain unique advantages in seepage studies. Especially when dealing with sources (leaks). In this paper, the numerical method and numerical calculation of the unsteady seepage flow in anisotropic media are studied by using the boundary element method. For the time-invariant problem of unsteady problems, we need to calculate the regional integrals. In this paper, we select the appropriate coordinate function, and apply Green’s formula again to convert the regional integrals into boundary integrals, so that we can only compute the boundary and make full use of the boundary element method Advantage. In this paper, Fortran language was compiled by the boundary element method BTAM program, and a number of cases were calculated.