Abstract
As a newly developed pile foundation, the snowflake shaped steel sheet pile is composed of three Y-shaped sections with an included angle of 120° and has a large specific surface area, which can give full play to the side friction of pile and improve the bearing capacity of single pile. At the same time, the snowflake shaped steel sheet pile has a high strength, relatively few materials, and it has good prospects with engineering applications. In order to accurately grasp the mechanical characteristics of the snowflake shaped steel sheet pile, this paper carried out the model test of snowflake shaped steel sheet pile based on OFDR (optical frequency domain reflector) distributed optical fiber sensor technology. The results show that: (1) OFDR distributed optical fiber sensing technology can effectively monitor the strain of snowflake steel sheet pile; (2) under the vertical load, the strain of snowflake steel sheet pile decreases along the length of the pile; (3) the strain of the same section of snowflake steel sheet pile is different at different positions, the strain at the junction between web and web is basically the same as the junction between web and flange, and the strain of the pile shaft on the flange edge is larger.
Highlights
Pile is the most common form of foundation reinforcement, the section forms of which are various, such as square, circular, triangular, and so on
The snowflake shaped steel sheet pile has a large specific surface area, which can fully play the role of pile side friction; the steel has high strength, which can drive into hard soil without damage to the pile shaft
The snowflake shaped steel sheet pile can save materials, it can be welded on site and have large reinforcement area, and it is convenient for transportation and production
Summary
Pile is the most common form of foundation reinforcement, the section forms of which are various, such as square, circular, triangular, and so on. The snowflake shaped steel sheet pile can save materials, it can be welded on site and have large reinforcement area, and it is convenient for transportation and production. This new pile technology is suitable for solving the problems of bump at bridge head, uneven settlement, soft soil foundation reinforcement and emergency construction. The optical fiber sensors and strain gauges were used to monitor steel sheet pile model test. The steel optical fiber sensors strain gauges used to monthe deformation of snowflake sheet pile underand vertical load at thewere same time. Itor the deformation of snowflake steel sheet pile under vertical load at the same time
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