Relationship between pore water pressure and dissipated energy of fiber-reinforced sand

• Published in: IOP conference series. Earth and environmental science 2021-05, Vol.768 (1), p.12105
• Main Authors: Liu, Mingming, Li, Gang, Zhang, Jinli, Liu, Jia, Yang, Zhuangyi
• Format: Article
• Language: English
• Subjects: Damage detection; Earthquake damage; Earthquakes; Emergency preparedness; Energy dissipation; Fiber reinforced materials; Flux density; Growth stage; Liquefaction; Pore water; Pore water pressure; Sand; Sandy soils; Seismic activity; Stress ratio; Superstructures; Water pressure
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/768/1/012105

Under the loading of earthquake, sandy soil is prone to liquefaction and resulting in the superstructure damage. Therefore, the liquefaction identification of sandy soil is the primary task of liquefaction disaster prevention. Based on the energy dissipation method, the relationship between pore water pressure (u) and dissipated energy density ( W ) of fiber-reinforced sand (FRS) is established, and the effects of fiber length ( FL ), fiber content ( FC ), cyclic stress ratio ( CSR ), and relative density ( Dr ) on the accumulation of u are analyzed. The results showed that fiber addition can effectively slow down the liquefaction of FRS, and the curve of u and W can be divided into rapid growth stage, stable ascend stage and slow growth stage. When the u keep constant, the W increases with the increasing of FL and FC . Whereas, the u decreases with the increasing of FL and FC when the W keep constant. The u and W are less affect by CSR , and the dense sand of FRS is less prone to liquefaction than loose sand.