Abstract
The cyclic triaxial system is used to investigate the effects of confining pressure, initial shear stress, vibration frequency, and dynamic stress on the pore-water pressure characteristics of saturated sand in the Wenchuan area. Results show that the initial shear stress has a remarkable effect on the development of the dynamic pore-water pressure of saturated sand. The greater the initial shear stress, the slower the development curve of the pore-water pressure of saturated sand and the higher the number of cycles required to reach the same pore-water pressure. The larger the initial shear stress, the smaller the dynamic pore-water pressure when the sample is destroyed. Moreover, the maximum pore-water pressure ratio decreases linearly with the increase of the consolidation ratio. The normalised relationship curve between the dynamic pore-water pressure and failure time of vibration is consistent with the development law of the power function. The power function model parameters are affected by the initial shear stress and confining pressure. At the time of isotropic consolidation, the accumulation law of pore-water pressure presents a growth pattern of “fast-stable-intensified.” A modified pore-water pressure model considering vibration frequency is proposed on the basis of the Seed pore-water pressure model, and the model parameters are linear with the vibration frequency. When the vibration frequency remains unchanged, the parameter does not change with the confining pressure and dynamic stress. This modified model can predict the change rule of pore-water pressure with the frequency under isotropic consolidation.
Highlights
Research ArticleReceived 3 July 2018; Revised 5 October 2018; Accepted 25 October 2018; Published 14 November 2018
China is an earthquake-prone country with a wide distribution of earthquakes
A large number of earthquakes indicate that the liquefaction of saturated sand has caused great damage to pile foundations, embankments, slopes, and dams [1]
Summary
Received 3 July 2018; Revised 5 October 2018; Accepted 25 October 2018; Published 14 November 2018. E cyclic triaxial system is used to investigate the effects of confining pressure, initial shear stress, vibration frequency, and dynamic stress on the pore-water pressure characteristics of saturated sand in the Wenchuan area. Results show that the initial shear stress has a remarkable effect on the development of the dynamic pore-water pressure of saturated sand. E normalised relationship curve between the dynamic pore-water pressure and failure time of vibration is consistent with the development law of the power function. E power function model parameters are affected by the initial shear stress and confining pressure. When the vibration frequency remains unchanged, the parameter does not change with the confining pressure and dynamic stress. Is modified model can predict the change rule of pore-water pressure with the frequency under isotropic consolidation When the vibration frequency remains unchanged, the parameter does not change with the confining pressure and dynamic stress. is modified model can predict the change rule of pore-water pressure with the frequency under isotropic consolidation
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call