Research on the Springback Quantity of the Load Test on High-Speed Railway
With the development of high-speed railway, roadbed reinforcement of its use of high strength prestressed concrete pipe pile, and reflected wave method with low strain and slow preloading method for integrity testing of the pile and pile load test, according to “Technical specification for testing of railway piles” TB10218-2008 requirements, slow static test of the maximum load of not less than 2 times the design load; pile field under construction, the pile placed on top of limestone , pile bearing stratum good features, especially more complete proposed limestone pile placed on top of limestone (rock) of the pipe, the static test pile to take the maximum load of 1.2 times the design load, and load and take Q-s curve of settlement, maximum springback quantity and the corresponding settlement is vertical bearing capacity characteristic value of single pile.
J. Y. Chang and Z. J. Liu, "Research on the Springback Quantity of the Load Test on High-Speed Railway", Applied Mechanics and Materials, Vols. 99-100, pp. 414-419, 2011