This was a large scale construction project under complicated circumstances, with siting in an aseismicregion of 7 degree fortification.
该工程建设规模庞大、建设条件复杂，隧址位于7度抗震设防区内。
2
A synthetic study of analogy has been made by using the structural factors between these structure backgrounds and 25 aseismic sub-areas selected randomly from the studied region.