Abstract
Based on the statistical analysis of surrounding rock deformation from 56 fault tunnels in China, the overall distribution characteristics and time evolution laws of surrounding rock deformation and the relationships with buried depth of tunnel and the height-span ratio are studied. The results of the statistical analysis show that the deformation is excessive when the tunnel passes through the fault zone. The average deformation value of surrounding rock in railway fault tunnels is maximum and second in highway fault tunnels and minimum in subway fault tunnels. The average value of peripheral convergence is larger than that of vault settlement. The deformation increases with the increases of buried depth, and the deformation in railway fault tunnels shows obvious concentration with the change of the height-span ratio. There is a significant time evolution law of surrounding rock deformation in fault tunnels, which can be roughly divided into three stages: rapid growth, slow growth and stabilization. The results offer some references for the optimal design of supporting structure and the reasonable construction time of secondary lining when the tunnels pass through the fault zone.
Highlights
In order to meet the needs of the rapid development of transportation in China, the building of highway and railway tunnels have been continuously developing to a scale of “longer, larger and deeper”
The design and construction of tunnel crossing fault fracture zone has always been a big problem during the tunnel construction
Based on the measured data of 134 sections of 56 domestic tunnels crossing fault zones, this paper analyzes the overall distribution characteristics and time regularity of surrounding rock deformation when tunnels pass through fault fracture zone
Summary
In order to meet the needs of the rapid development of transportation in China, the building of highway and railway tunnels have been continuously developing to a scale of “longer, larger and deeper”. Based on the vault settlement and horizontal convergence data of 103 mountain tunnels in China, Fang et al.[7] analyzed the relationship between the deformation value, the stability time and the grade of the surrounding rock, tunnel excavation area, and buried depth. Based on the measured data of 134 sections of 56 domestic tunnels crossing fault zones, this paper analyzes the overall distribution characteristics and time regularity of surrounding rock deformation when tunnels pass through fault fracture zone. The relationships between surrounding rock deformation and tunnel buried depth, excavation span are studied, in order to provide theoretical support for the design and construction scheme of tunnel in fault fracture zone. The proportion of vault settlement data in the low value area (0-100 mm) is 72.7%, which is greater than the surrounding convergence (66.7%), indicating that the lateral deformation is greater than the vertical deformation in the fault tunnels
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