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| Citation: | Liu Wei, Sun Xinran, He Naiwu, 2022. Structural Evolution and Mechanical Response Mechanism of Loess in Strong Earthquake Area. Earth Science, 47(12): 4442-4455. doi: 10.3799/dqkx.2022.402
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Loess poses a serious threat to the safety of engineering structures because of its collapsibility and deformation when it encounters water. The internal structure of loess in strong earthquake areas will change after encountering historical earthquakes, and the structural evolution is closely related to the initial water content of loess. Structural damage of loess by historical earthquakes also affects its macroscopic mechanical characteristics: In order to reveal the mechanism of the structural evolution and mechanical response of loess in strong earthquake areas, the loess samples were pre-seismically treated with dynamic loads under different PGA (peak ground acceleration) conditions via dynamic triaxial tests, so that the disturbance of historical earthquakes to loess was simulated. Afterwards, the undrained test was carried out to analyze the correlation between the shear strength parameters, the seismic load and initial water content. The test results show that when the initial moisture content is 2%, the peak strength of the loess sample with pre-seismical treatment is significantly lower than that of the sample without pre-seismical treatment, and with the increase of PGA, the peak strength decreases. The pore water pressure eventually tends to be constant with the continuous increase of the strain, the effective axial stress and the effective confining pressure decrease with the continuously increasing strain, and finally tend to be content. When the initial water content increased to 12%, the strength of the loess sample after pre-seismical treatment increased.By drawing the stress path relationship curve, the critical instability line and failure line of the loess in the strong earthquake area are determined. For the same loess samples, the increase of PGA causes the loess instability line to move down continuously, indicating that the stress state in the loess changes with the increase of the earthquake dynamic load. When the initial moisture content is 12%, the shear strength of the loess sample after pre-seismic treatment increases.
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