3Gonghnour R R. Settlement of vertically loaded stone columns in soft ground [ A ]. Proc. of 8 ECSMFE [ C ]. 1983,( 1 ) : 235 - 240.
4Van Impe , W F & E E De Beer. Improvement of settlement behavior of soft layer by means of stone columns[ A]. Proc. 8th European Conference on Soil Mechanics and Foundation Engineering[ C ]. Rotterdam, 1983, ( 1 ) :309 - 312.
