A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental study on the adjustments of servo steel struts in deep excavations
https://orcid.org/http://orcid.org/0000-0002-6720-4855
Recently, servo steel struts have been increasingly used in deep foundation pits that require strict control over the deformation of the surroundings induced by excavation. However, the effects of strut length and axial force adjustments of servo struts on wall deflection and lateral earth pressure behind the wall are still unclear. In this study, a model excavation support system was constructed, and several model tests were conducted to investigate the effects of strut adjustments in which the axial forces and lengths of the struts were adjusted to various values. The strut axial forces, lateral earth pressure, and wall deflection were monitored and analyzed. The results show that: (i) the effects of the strut length and axial force on the lateral wall deflection vary with the depth of the adjusted struts. Adjustments of the struts at lower levels can reduce lateral wall deflections and effectively control the deformations. (ii) Increments in both the axial force and length of the struts result in lateral earth pressure changes between the at-rest and passive earth pressures in the vicinity of the adjusted struts. Neutral points can be observed during strut adjustments where the lateral earth pressures remain relatively constant. The locations and number of these neutral points varied depending on the depth of the adjusted struts. (iii) Simultaneous adjustments of the axial forces on multiple layers of struts are more effective in controlling lateral wall deflection than single-layered strut adjustments.
Experimental study on the adjustments of servo steel struts in deep excavations
https://orcid.org/http://orcid.org/0000-0002-6720-4855
Recently, servo steel struts have been increasingly used in deep foundation pits that require strict control over the deformation of the surroundings induced by excavation. However, the effects of strut length and axial force adjustments of servo struts on wall deflection and lateral earth pressure behind the wall are still unclear. In this study, a model excavation support system was constructed, and several model tests were conducted to investigate the effects of strut adjustments in which the axial forces and lengths of the struts were adjusted to various values. The strut axial forces, lateral earth pressure, and wall deflection were monitored and analyzed. The results show that: (i) the effects of the strut length and axial force on the lateral wall deflection vary with the depth of the adjusted struts. Adjustments of the struts at lower levels can reduce lateral wall deflections and effectively control the deformations. (ii) Increments in both the axial force and length of the struts result in lateral earth pressure changes between the at-rest and passive earth pressures in the vicinity of the adjusted struts. Neutral points can be observed during strut adjustments where the lateral earth pressures remain relatively constant. The locations and number of these neutral points varied depending on the depth of the adjusted struts. (iii) Simultaneous adjustments of the axial forces on multiple layers of struts are more effective in controlling lateral wall deflection than single-layered strut adjustments.
Experimental study on the adjustments of servo steel struts in deep excavations
https://orcid.org/http://orcid.org/0000-0002-6720-4855
Recently, servo steel struts have been increasingly used in deep foundation pits that require strict control over the deformation of the surroundings induced by excavation. However, the effects of strut length and axial force adjustments of servo struts on wall deflection and lateral earth pressure behind the wall are still unclear. In this study, a model excavation support system was constructed, and several model tests were conducted to investigate the effects of strut adjustments in which the axial forces and lengths of the struts were adjusted to various values. The strut axial forces, lateral earth pressure, and wall deflection were monitored and analyzed. The results show that: (i) the effects of the strut length and axial force on the lateral wall deflection vary with the depth of the adjusted struts. Adjustments of the struts at lower levels can reduce lateral wall deflections and effectively control the deformations. (ii) Increments in both the axial force and length of the struts result in lateral earth pressure changes between the at-rest and passive earth pressures in the vicinity of the adjusted struts. Neutral points can be observed during strut adjustments where the lateral earth pressures remain relatively constant. The locations and number of these neutral points varied depending on the depth of the adjusted struts. (iii) Simultaneous adjustments of the axial forces on multiple layers of struts are more effective in controlling lateral wall deflection than single-layered strut adjustments.
Experimental study on the adjustments of servo steel struts in deep excavations
Acta Geotech.
Di, Honggui (author) / Jin, Yuyin (author) / Zhou, Shunhua (author) / Zhang, Xiaohui (author) / Wu, Di (author) / Guo, Huiji (author)
Acta Geotechnica ; 18 ; 6615-6629
2023-12-01
15 pages
Article (Journal)
Electronic Resource
English
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