Abstract
Based on the characteristics of moso bamboo including high short‐term strength, stable performance, and ability to provide temporary support for shallow foundation pits in soft soil, the stress characteristics and supporting effects of the ecological composite supporting system have been explored through model tests and numerical calculation analysis of the moso bamboo micropile‐composite soil nailing structure. The results showed that the bamboo pile can effectively control the horizontal deformation of the side wall of the foundation pit and the ground surface settlement, achieving a relatively satisfactory supporting effect. Furthermore, the bamboo pile has visibly bent in middle and lower parts, where the regional shear point is most likely to appear, the axial force of the soil nail is distributed in an oval pattern with a smaller force on both sides and a larger force in the middle part, the maximum axial strain is 447.3 με, and the axial force of the soil nails in each row follows a similar trend. The synergy of piles and soil nails can delay the formation of the slip surface, therefore enhancing the overall bearing capacity of the foundation pit. These results can shed light on the support mechanism and engineering design of bamboo piles in shallow soft soil foundation pits.
Highlights
At present, the main materials used in the main part of the foundation support structure in China are cement and steel, but the production of these materials will consume lots of energy and produce much pollution. e support structure is usually temporary
The model tests and numerical calculations of the moso bamboo micropile-composite soil nailing structure for wall support have been conducted. e bearing characteristics and supporting effect of the moso bamboo micropile-composite soil nailing system have been discussed in detail from the aspects of surface settlement, internal force and deformation of pile, pressure of the soil around pile, and the soil nail axial force of the supporting structure, to provide a reliable theoretical basis and analysis method for the application of moso bamboo composite-based supporting systems in soft soil shallow foundation pits
The change and increase rate of the earth pressure above the excavation surface of the foundation pit occur relatively fast, while the increase rate of the earth pressure below the excavation surface is relatively small because the middle and upper areas of the bamboo pile are exposed for a long time, the pile top and the pile are subjected to more loads, and the loading on the top is
Summary
The main materials used in the main part of the foundation support structure in China are cement and steel, but the production of these materials will consume lots of energy and produce much pollution. e support structure is usually temporary. Moso bamboo soil nailing wall-supporting structures have been applied in engineering and achieved excellent supporting effect, but their reinforcement mechanisms, load transfer paths, and failure modes need to be further studied [1, 2]. The model tests and numerical calculations of the moso bamboo micropile-composite soil nailing structure for wall support have been conducted. E bearing characteristics and supporting effect of the moso bamboo micropile-composite soil nailing system have been discussed in detail from the aspects of surface settlement, internal force and deformation of pile, pressure of the soil around pile, and the soil nail axial force of the supporting structure, to provide a reliable theoretical basis and analysis method for the application of moso bamboo composite-based supporting systems in soft soil shallow foundation pits The model tests and numerical calculations of the moso bamboo micropile-composite soil nailing structure for wall support have been conducted. e bearing characteristics and supporting effect of the moso bamboo micropile-composite soil nailing system have been discussed in detail from the aspects of surface settlement, internal force and deformation of pile, pressure of the soil around pile, and the soil nail axial force of the supporting structure, to provide a reliable theoretical basis and analysis method for the application of moso bamboo composite-based supporting systems in soft soil shallow foundation pits
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