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2. Chen SH, Xu Q, Hu J. Composite element method for seepage analysis of geotechnical structures with drainage hole array. J Hydrodyn (Ser. B). 2004;16(3):260–6.
3. Chen SH, Qin N, Xu GS, Shahrour I. Hierarchical algorithm of composite element containing drainage holes. Commun Numer Methods Eng. 2010a;26(12):1856–67.
4. Chen SH, Xue LL, Xu GS, Shahrour I. Composite element method for the seepage analysis of rock masses containing fractures and drainage holes. Int J Rock Mech Min Sci. 2010b;47(5):762–70.
5. Hu J, Chen SH. Air element method for modeling the drainage hole in seepage analysis. Rock Soil Mech. 2003;24(2):281–7 (in Chinese).