Abstract
The transverse and axial bearing characteristics of bridge pile foundation in salt marsh area are studied by numerical simulation. This paper mainly analyses the change of transverse and axial bearing characteristics of pile foundation caused by the change of spalling thickness of bridge foundation. The results show that the transverse and axial bearing capacity and displacement of pile foundation will be affected by the change of concrete spalling thickness under the condition of pile corrosion. When the peeling thickness is above 9.0cm, the transverse and axial bearing characteristics of pile foundation are obviously different with the change of corrosion depth of pile body. When the peeling thickness increases and the corrosion depth of the pile body is different, the negative displacement below the zero point of the first displacement of the pile body is continuously reduced, and the displacement curve above the first displacement zero point in the direction of the pile body begins to shift. When the peeling thickness reaches 15.0cm, the pile top displacement increases to 3.75mm. The research results are of great significance to the establishment of safety evaluation system of highway bridge pile foundation in alpine salt marsh area, and provide a basis for the structural design of highway bridge pile foundation in alpine salt marsh area.
Highlights
Bridge pile foundation is the most important bearing structure in the process of bridge use, in addition to being affected by vertical load, it will inevitably be affected by transverse and axial load
Zhang Kunyong uses the finite element method to carry out the numerical test on the loading process of the transverse and axial loaded rock-socketed pile, and obtains the load-displacement curve which is consistent with the loading range of the field test, and verifies the rationality of the numerical model [6]
The infrastructure construction of highway transportation in China is developing continuously, and the construction is widely used in special soil areas
Summary
Bridge pile foundation is the most important bearing structure in the process of bridge use, in addition to being affected by vertical load, it will inevitably be affected by transverse and axial load. Through the analysis of the transverse and axial working performance of the pile foundation of the steep slope bridge in Qinba Mountain area, He Jianjun uses the finite element analysis software to calculate the load transfer mechanism and bearing characteristics of the bridge pile foundation under different slope, pile length and pile diameter in the steep slope section. Feng Jun made an in-depth study on the transverse and axial bearing characteristics of bridge group pile foundation with high cap in soft soil [8] In recent years, the theoretical research on the transverse and axial bearing characteristics of pile foundation is in-depth development [9,10,11,12]. With the progress of the western development strategy, the highway is constantly advancing to a more complex environment, at the same time, pile foundation as an important part of highway construction, it is necessary to improve the ability of pile foundation to resist complex environment [13,14,15,16,17]
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