Study on the combined impact about joint dip angle and rock thickness on the excavation stabilities of tunnels with large-span based on numerical experiment
DOI:
https://doi.org/10.14311/Keywords:
Tunnel with large-span, Numerical test, Influence rule, Surrounding rock stabilityAbstract
The stabilities about surrounding rocks are closely related to the characteristics of the joints when tunnel passing through layered joint rock masses. However, existing research has mainly focused on the stabilities about tunnels in single joint rock masses, and there is still little attention paid to situations with large spans and complex geological conditions. Therefore, based on the Chongqing Guobo Station Tunnel Project, using numerical experimental method, this paper conducts in-depth research on the relationship between joint dip angle, joint rock layer thickness and surrounding rock stabilities of tunnel. The research findings indicate that changes in joint dip angle and joint layer thickness largely influence the stabilities about surrounding rock, and the maximum increment of tunnel deformation under different conditions is close to 400mm. The deformation about the surrounding rock displays a tendency of first slowing down while then rising with the inclination angles. The difference between the displacement in the directions perpendicular to the joint surface and the directions along the bedding plane first decreases and then increases, ultimately dominated by the displacement in the bedding direction. The maximum displacement gradually moves from the arch shoulder to the crown. For the large joint dip angles, surrounding rock mainly experiences tensile yield failures along joint’s surface direction, and shear yield failure perpendicular to the joint surface direction. When the thicknesses about joint layer increases, the displacement about surrounding rock as well as distribution range in plastic zone decrease, the overall integrity about surrounding rock improves, and the stability is enhanced. The research results of this article can be valuable guidance for analogous project in the future.
Received: 13.12.2024
Received in revised form: 15.7.2025
Accepted: 1.9.2025
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