4He Guisheng, Zhang Luxin. Analysis on climate change and thermal stability of experimental railway embankment in Fenghuoshan region of Qinghai-Tibet Plateau. Jounal of Glaciology and Geocryology, 2000, 22 ( suppl. ) : 20 -25.
5Sun Binxiang, Xu Xuezu, Lai Yuanming et al. Experimental researches of thermal diffusivity and cortduetivity in embankment ballast under periodically fluctuating temperature. Cold Regions Science and Technology, 2004 (38) : 219 - 227.
8Goering, D. J, Kumar, P. Permeability effects on winter - time natural con- vection in gravel embankments. Cold Regions Science and Technology. 1996 (24) : 57 -74.