6PECK R B. Deep excavations and tunneling in soft ground EC//Proeeeding of 7th International Conference on Soil Me- chanics and Foundation Engineering. Mexico City: Sate of the Art Report, 1969:225-290.
7OrREILLY M P, NEW B M. Settlement above tunnels in the united kingtom-their magnitude and predietion[-C//Proceed- ings of Tunnelling 82 Symposium. London: The Institution of Mining and Metallurgy, 1982:173-290.
8MAIR R J, TALYER R K. Bored tunneling in the urban en- vironment[-C]//Proceedings of The Fourteenth International Conference on Soil Mechanics and Foundation Engineering. Hamburg: Balkema A A, 1997:2353-2380.
