9PECK R B. Deep excavation and tunneling in soft ground[ C]// GRAVEL M. Proc 7th International Conference Soil Me- chanics and Foundation Engineering. Mexico City :State of the Art Reports, 1969:225-290.
10MAIR R J, TAYLAR R N, BRACEGIRDLE A. Subsurface settlement profiles above tunnels in clays [ J ]. Geotechnical, 1993,43(2) :315-320.