Case Study on Type Selection of Shields for Chengdu Metro
CAO Zhi1, LI Jianxiang2
(1. China Railway City Development and Investment Co., Ltd., Chengdu 610031, Sichuan, China; 2. Shield Department of Line 3 of Chengdu Metro, The Sixth Engineering Bureau, CREC, Chengdu 610031, Sichuan, China)