Liquefaction and Reliquefaction Characteristics of Aeolian Sand Foundation Reinforced by Precast Cement Piles Based on Shaking Table Test

With the continuous development of traffic construction, road engineering inevitably crosses aeolian sand river valley area. Compared with general sandy soil and silty soil, cohesionless foundation has similar properties fluid higher liquefaction potential. Precast cement pile can greatly improve vertical bearing capacity foundation, but this paper finds that it also antiliquefaction effect when is used to reinforce foundation. In addition, there may be more than one in areas frequent earthquakes. Therefore, explores reliquefaction characteristics reinforced by precast piles through shaking table test. The test results show under excitation 0.4 g EL Centro wave: (1) increase pore pressure will have multiple instantaneous peaks, which promote surface float or sink. phenomenon weakened earthquakes reinforcement. (2) prefabricated resistance best shallow layer increased 30%, deeper buried depth, lower effect. (3) ability improved after strong earthquake, dynamic response significantly next earthquake. (4) When reliquefied, main frequency migrate low frequency. liquefied inhibit (2 ~ 15 Hz) energy transfer high (25~30 transfer. provide reference for design application