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Huang S.,University of Science and Technology Beijing | Huang S.,China Academy of Rails Science | Huang S.,Cooperation Technology | Song B.,University of Science and Technology Beijing | And 9 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Pluging the relation between the pore water pressure and liquefaction resistance rate into calculation formula of the permanent displacement of slope based on Newmark method, a simple calculation method of the permanent displacement is established. The influence laws of slope ratio, height, underground water level, earthquake magnitude and seismic spectrum characteristics on permanent displacement and safety factor of the slope are studied. The results show that the influence of groundwater on permanent displacement and safety factor under earthquake is significant, which could not be neglected for the stability analysis of slope. If the vertical acceleration is not considered, the stability of slope will be overestimated. The influence of slope height on permanent displacement and safety factor is greater than the slope rate. The permanent displacement values under far field earthquakes (Tl-II-1) are greater than that under near-field earthquake (T2-II-1). Finally using nonlinear regression fitting, the relation between the safety factor and permanent displacement considering the influence of groundwater are obtained. The permanent displacement of slope can be quickly solved by solving the safety factor and generating into the equation, which provides reference for the seismic design based on the performance.


Song B.,University of Science and Technology Beijing | Song B.,Cooperation Technology | Huang S.,University of Science and Technology Beijing | Huang S.,Cooperation Technology | And 9 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Based on the finite element model of sandy slope, the laws of seismic dynamic response and failure mode influenced by underground water are studied and the shaking table test is carried out. The research results show with the increase of groundwater, the maximum horizontal acceleration of slope shows decreasing trend under near-field and far-field earthquakes; The maximum horizontal displacements of slope are greater than that without groundwater, which is more apparent under near-field earthquake, and the maximum horizontal displacements of slope show increasing trend with the increase of groundwater; The influence of far field earthquake on the maximum horizontal displacements at the slope toe are greatest, while the influence of near field earthquake on the maximum horizontal displacements at the top of the slope are greatest; Excess pore water pressure rises abruptly which shows the maximum value and makes the slope shear sliding at the slope toe easily; Natural vibration period shows increasing trend with the increasing of groundwater and the natural vibration period of the highest water depth increases 2.88 times than that without water. Without considering the groundwater, the slope firstly shows tensile rupture on the top of slop which shows obvious whipping effect, while the destruction of slope is mainly the shearing damage through the slope toe with the accumulation of excess pore water pressure; Finally, based on the comparison of shaking table test and the numerical simulation, the accuracy of numerical simulation results of this paper are verified.

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