Research on the combined control of tunnel deformation adjacent to the foundation pit by servo steel strut and capsule grouting
Abstract To address the issue of controlling the deformation of adjacent tunnels after excavation of the foundation pit, a method combining servo steel strut and capsule grouting for controlling the deformation of adjacent tunnels is proposed. First, the scaled model tests were conducted to determin...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-07678-z |
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| Summary: | Abstract To address the issue of controlling the deformation of adjacent tunnels after excavation of the foundation pit, a method combining servo steel strut and capsule grouting for controlling the deformation of adjacent tunnels is proposed. First, the scaled model tests were conducted to determine the influence of the number of servo loading and their arrangement on the stress and deformation of the tunnel and diaphragm wall under the same capsule grouting conditions. This led to the identification of the optimal servo loading mode. Subsequently, numerical simulations were performed to analyze the effects of different double-row capsule grouting spacings on the tunnel and diaphragm wall under the optimal servo loading mode. The research results indicate that in the model tests, both servo loading and capsule grouting reduce the horizontal deformation and horizontal convergence of the tunnel but increase the tunnel settlement and pressure at the right hance. The greater the number of servo loading struts, the more effective the control of deformation in the diaphragm wall and tunnel. When the number of servo steel strut is constant, the closer the burial depth of the servo loading arrangement is to the burial depth of the tunnel axis, the greater the deformation of the tunnel. In the numerical simulations, the change in the horizontal spacing of the double-row capsule grouting has a greater impact on the deformation of the diaphragm wall and the right hance of the tunnel than changes in the tunnel clearance. The smaller the horizontal spacing, the greater the deformation of the diaphragm wall and the right hance of the tunnel. |
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| ISSN: | 2045-2322 |