6T. Sehlegel. Application of a new subgrade modulus theory to calculation for flexible foundations in granular materials[ J].International Journal of Rock Mechanics and Mining Science, 1985,22(6) :182 - 189.
7TORREY V H ,DONAGHE R T. Compaction control of earth- rock mixtures: a new approach [ J]. ASTM geotechnical tes- ting journal, 1994,17 (3) :371 - 386.