STUDY OF MECHANICAL CHARACTERISTICS OF SECONDARY LINING OF LARGE-SECTION LOESS TUNNEL
LI Pengfei1，ZHANG Dingli1，ZHAO Yong1，2，ZHOU Ye1，3，FANG Qian1，ZHANG Xuan1
(1. Tunnel and Underground Engineering Research Center of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；2. Engineering Design and Appraisal Centre of Ministry of Railways，Beijing 100844，China；3. China Railway 19th Bureau Group Co.，Ltd.，Beijing 100176，China)
Abstract：Taking Humaling tunnel in Lanzhou—Chongqing railway as project background，contact pressure between the primary lining and secondary lining of large-section loess tunnel was acquired by means of in-situ monitoring；development law over time and spatial distribution along the tunnel ring of the contact pressure were discussed. Loads on the secondary lining were calculated according to code for design on tunnel of railway. Internal force of the secondary lining under calculation loads and monitoring loads was solved individually by load-structure model；and a comparative analysis was conducted. The study method and conclusions can provide references to analyze the mechanical characters of lining in soft ground and establish a scientific and reasonable design method of tunnel.
