The earthquake force under the action of slope stability analysis and reinforcement effect evaluation
Taking a high slope of a loess roadbed in Sanyangchuan area of Tianshui city as a study,considering the earthquake conditions occurring in the area for many years,the stability of the slope is calculated by numerical simulation analysis using GeoStudio software,and the destabilized slope is reinforced with anchors to evaluate the reinforcement effect,the results show that:(1)the slope is in a stable state in static state,when the input peak acceleration of 0.25 g of the horizontal When the peak acceleration is 0.25 g,the slope is in a stable state under the static condition,and when the peak acceleration is 0.25 g,the slope is in a stable condition under the seismic action,the two evaluation methods of time-range analysis and Newmark method show that the slope is destabi-lized,in which the time-range analysis shows that the minimum safety coefficient is only 0.83,and the Newmark method shows that the slope produces a permanent displacement of 2.02 cm.(2)Comparing the safety coefficients obtained by the time-range analysis and the proposed static method,we can see that the use of the average safety coefficient is over-estimation.(3)The stabilized slope is reinforced by anchors,and numerical simulations are carried out for different angles of incidence of anchors,and the results show that the best reinforcement effect is a-chieved when the angle of incidence of anchors is 19°,and the coefficient of safety after reinforcement is 1.25.At the same time,the three methods are used in the evaluation of the reinforcement of anchors under the action of seis-mic force,which indicates that the M-P method may be overestimate the stability of the slope,and Janbu method is more conservative,while the evaluation using Bishop method is more reasonable.
stability analysisnumerical simulationtime history analysisquasi-static methodslope rein-forcement
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维普
