A Loose Circle Test Technique Suitable for Weak Rock Tunnels Based on Glass Fiber Anchor MicroStrain Test and Its Application

ZHANG Junru, LIN Chao, CHEN Zhenglü, FENG Jimeng

Tunnel Construction . 2018, (S2): 39 -45 . DOI: 10.3973/j.issn.2096-4498.2018.S2.006