Construction mechnical effect of highway tunnelwith four lanes in layered rockmass

International Conference on Manufacturing Technology, Materials and Chemical Engineering

机械制造;材料科学;化学工业

Hou, Fu Jin^1 ; Han, Xian Min^2 ; Li, Wen Jiang^2 ; Li, Xin Zhi^2

Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong

250000, China^1

School of Civil Enginnering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei

050043, China^2

关键词: Deformation and failures;    Elasticity moduli;    Laboratory experiments;    Lattice girders;    Layered rockmass;    Rock mass structure;    Surrounding rock;    Transverse isotropy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/392/6/062136/pdf
DOI  :  10.1088/1757-899X/392/6/062136

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Jiangshuiquan tunnel was a highway tunnel with four lanes. Its maximum excavation cross section was 170.1 m2 in Class III surrounding rock. The host rock was horizontal layered limestone, and it have obvious transverse isotropy. Based on laboratory experiments and site survey of rockmass structure, mechnical parameters of rockmass were determined. Numerical simulation and field test were used to study the deformation and failure characteristics of tunnel, pressure of surrounding rock, stress of shotcrete and lattice girder. It was concluded that lateral elasticity modulus of rockmass was obviously bigger than vertical elasticity modulus. Settlement of vault was the main deformation form of surrounding rock. Rock-falling in spandrel and delaminating collapse of roof were the common failure phenomenon. Setting rock bolt in vault was necessary in horizontal layered rockmass. Compared wtith other postions, pressure of surrounding rock, stress of shotcrete and steel frame of the vault were relatively small.