Abstract
Evolution characteristics analysis of pressure-arch in a double-arch tunnel
Highlights
The double-arch tunnel is a special tunnel and its lining structures between two adjacent tunnels are supported by the pillar between them
The evolution process and the skewed effect (The geometry and deformation parameters of the pressure-arch are not symmetrical after the double-arch tunnel being excavated, we called these characteristics the skewed effect) of the pressure-arch under the step-by-step excavation are essential problems, which have been of wide concern for the scholars and technical personnel in the field of engineering
Yang et al analysed the stability of the pressure arch and the instability failure modes after the tunnel excavation using similar model test, [14]
Summary
The double-arch tunnel is a special tunnel and its lining structures between two adjacent tunnels are supported by the pillar between them. Kovari first found there was a pressure-arch effect in the loose rock with the tunnel excavation [3]. The Chinese scholars such as Li et al monitored the construction deformation of the large span multi-arch tunnel under complex geological conditions, and proposed the engineering measures to control the large deformation [10]. Zhu et al analysed the construction sequence and the supporting force of the shallow-buried tunnel by numerical simulation method [11]. Combining physical model experiment with numerical simulation, Jin et al analysed the temporal-spatial effect of the force and deformation of the supporting structure of the six-lane multi-arch tunnel [12]. Taking the double-arch tunnel as an example, the evolution mechanism and the skewed effect of the pressure-arch during step-by-step excavation need to be further studied
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