Analytical study on pretensioned bolt-cable combined support of large cross-section tunnel

To study the mechanical responses of large cross-section tunnel reinforced by pretensioned rock bolts and anchor cables, an analytical model is proposed. Considering the interaction between rock mass and bolt-cable support, the strain softening characteristic of rock mass, the elastic-plastic charac...

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Bibliographic Details
Published in:Science China. Technological sciences 2020-09, Vol.63 (9), p.1808-1823
Main Authors: Luo, JiWei, Zhang, DingLi, Fang, Qian, Li, Ao, Sun, ZhenYu, Cao, LiQiang
Format: Article
Language:English
Subjects:
Anchor bolts
Bolts
Cables
Computer simulation
Cross-sections
Design parameters
Engineering
Ground motion
High speed rail
Mathematical models
Parametric analysis
Plastic deformation
Preliminary designs
Railway tunnels
Rock bolts
Rock masses
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Summary:To study the mechanical responses of large cross-section tunnel reinforced by pretensioned rock bolts and anchor cables, an analytical model is proposed. Considering the interaction between rock mass and bolt-cable support, the strain softening characteristic of rock mass, the elastic-plastic characteristic of bolt-cable support, and the delay effect of installation are considered in the model. To solve the different mechanical cases of tunneling reinforced by bolt-cable support, an analytical approach has been put forward to get the solutions of stress and displacement associated with tunneling. The proposed analytical model is verified by numerical simulation. Moreover, parametric analysis is performed to study the effects of pretension force, cross-section area, length, and supporting density of bolt-cable support on tunnel reinforcement, which can provide references for determining these parameters in tunnel design. Based on the analytical model, a new Ground Response Curve (GRC) considering the reinforcement of bolt-cable support is obtained, which shows the pretension forces and the timely installation are important in bolt-cable support. In addition, the proposed model is applied to the analysis of the Great Wall Station Tunnel, a high-speed railway tunnel with a super large cross-section, which shows that the analytical model of bolt-cable support was a useful tool for preliminary design of large cross-section tunnel.
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-019-1531-9