A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation
In consideration of the temporary stability of the cutting slope during construction and its permanent stability under long-term service, a new technique of lattice beam construction with anchors pre-set in the slope from the original ground surface before cutting was proposed, and its construction...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/12/11/1930 |
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| author | Junwei Fan Shijiao Yang Bo Deng Bing Sun Taoying Liu |
| author_facet | Junwei Fan Shijiao Yang Bo Deng Bing Sun Taoying Liu |
| author_sort | Junwei Fan |
| collection | DOAJ |
| description | In consideration of the temporary stability of the cutting slope during construction and its permanent stability under long-term service, a new technique of lattice beam construction with anchors pre-set in the slope from the original ground surface before cutting was proposed, and its construction process was briefly introduced. Compared with the model without pre-set anchors, the effectiveness of pre-setting anchors to strengthen the cutting slope during multi-excavation was verified in the numerical software FLAC<sup>3D</sup>. Various factors such as the factor of safety (FOS) and the maximum shear strain increment (MSSI) as well as the displacement for different stages were discussed. The results show that the anchors pre-set in the slope provide reinforcement step-by-step with excavations which changes the mechanical responses of the cutting slope and increases the factor of safety with a variation of 15.9–44.1% compared to the case without setting anchors. In addition, with excavations, the axial forces of the anchors pre-set in the stratum increase gradually, and the positions of the maximum axial forces gradually transfer from the vicinity of the cutting surface to the depth of the design slope. Numerical simulations prove that this new technique is beneficial for ensuring the temporary stability of the slope during excavations and is especially suitable for the advance anchorage of the cutting slope, in which the inclined original ground surface is cut at an angle steeper than it can stand safely and is close to the design slope surface after cutting. After the completion of slope excavation, the cast-in-place concrete lattice beam is immediately set on the design slope surface and connected with the anchor heads exposed on the cut slope surface to ensure the permanent stability of the slope. Therefore, this new technology has important guiding significance for both the temporary stability of slopes during construction and the permanent stability of slopes in service. |
| first_indexed | 2024-03-09T19:12:52Z |
| format | Article |
| id | doaj.art-062097a811ec41f6936aae17ba515cf0 |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-09T19:12:52Z |
| publishDate | 2022-11-01 |
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| series | Buildings |
| spelling | doaj.art-062097a811ec41f6936aae17ba515cf02023-11-24T03:59:57ZengMDPI AGBuildings2075-53092022-11-011211193010.3390/buildings12111930A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during ExcavationJunwei Fan0Shijiao Yang1Bo Deng2Bing Sun3Taoying Liu4School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, ChinaSchool of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, ChinaSchool of Civil Engineering, University of South China, Hengyang 421001, ChinaSchool of Civil Engineering, University of South China, Hengyang 421001, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410012, ChinaIn consideration of the temporary stability of the cutting slope during construction and its permanent stability under long-term service, a new technique of lattice beam construction with anchors pre-set in the slope from the original ground surface before cutting was proposed, and its construction process was briefly introduced. Compared with the model without pre-set anchors, the effectiveness of pre-setting anchors to strengthen the cutting slope during multi-excavation was verified in the numerical software FLAC<sup>3D</sup>. Various factors such as the factor of safety (FOS) and the maximum shear strain increment (MSSI) as well as the displacement for different stages were discussed. The results show that the anchors pre-set in the slope provide reinforcement step-by-step with excavations which changes the mechanical responses of the cutting slope and increases the factor of safety with a variation of 15.9–44.1% compared to the case without setting anchors. In addition, with excavations, the axial forces of the anchors pre-set in the stratum increase gradually, and the positions of the maximum axial forces gradually transfer from the vicinity of the cutting surface to the depth of the design slope. Numerical simulations prove that this new technique is beneficial for ensuring the temporary stability of the slope during excavations and is especially suitable for the advance anchorage of the cutting slope, in which the inclined original ground surface is cut at an angle steeper than it can stand safely and is close to the design slope surface after cutting. After the completion of slope excavation, the cast-in-place concrete lattice beam is immediately set on the design slope surface and connected with the anchor heads exposed on the cut slope surface to ensure the permanent stability of the slope. Therefore, this new technology has important guiding significance for both the temporary stability of slopes during construction and the permanent stability of slopes in service.https://www.mdpi.com/2075-5309/12/11/1930cutting slopepre-setting anchorlattice beamslope stabilitymulti-excavation |
| spellingShingle | Junwei Fan Shijiao Yang Bo Deng Bing Sun Taoying Liu A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation Buildings cutting slope pre-setting anchor lattice beam slope stability multi-excavation |
| title | A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation |
| title_full | A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation |
| title_fullStr | A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation |
| title_full_unstemmed | A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation |
| title_short | A New Technique of Lattice Beam Construction with Pre-Anchoring for Strengthening Cut Slope: A Numerical Analysis of Temporary Stability during Excavation |
| title_sort | new technique of lattice beam construction with pre anchoring for strengthening cut slope a numerical analysis of temporary stability during excavation |
| topic | cutting slope pre-setting anchor lattice beam slope stability multi-excavation |
| url | https://www.mdpi.com/2075-5309/12/11/1930 |
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