1[5]artos F., Conerning an approximate equation of subsidence trough and its time factors [A], Proc. of the International Strata Control Congress[C], Leipzig, 1958
2[6]Peck R. B, Deep excavation and tunneling in soft ground, State of the Art Report[[A]. Proc. 7th Int. Conf. on Soil Mechanics and Foundation Engineering [C], Mexico City,1969. 225 ~290