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Dynamic response of high filled embankment under earthquake in plateau permafrost areas(PDF)


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Dynamic response of high filled embankment under earthquake in plateau permafrost areas
WANG Shui-yin SHA Ai-min MU Ke ZHU Dong-peng JIN Long
1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. CCCC First Highway Consultants Co., Ltd., Xi’an 710068, Shaanxi, China
road engineering permafrost FEM earthquake high filled embankment dynamic response
Aiming at the problem that embankment in permafrost regions of Qinghai-Tibet Plateau was severely damaged under earthquake action, dynamic response model was established based on engineering geological conditions of G214 Highway, and the measured earthquake acceleration data of Xining station, Dawu station, Dulan station were collected as boundary conditions. The dynamic response of embankment under average annual ground temperature of -0.2 ℃, -0.5 ℃ and -0.8 ℃ were calculated. Based on this, the influence of temperature on embankment dynamic response was studied. Based on the temperature field calculation results of January, April, July and, October, influence of different seasons on dynamic response of embankment was calculated. 5, 10 and 15 m filled embankment were taken as samples, the dynamic response of embankment is analyzed with dynamic response. At the same time, considering the effect of cold and hot slope on embankment stability, the dynamic response differences between cold and hot slopes were compared. The influence weights of various factors on the dynamic stability of embankment were compared and analyzed, and the main factors were determined. The results show that the influence of filling height on stability of embankment is greater than that of season and temperature conditions. Peak value of hot slope side displacement is greater than that of cold side because of cold and hot slope effect. Horizontal displacement at road shoulder in hot side is 42.9%, which is larger than that of cold shoulder, and horizontal displacement at slope toe in hot side is 42.8%, which is larger than that of cold side. October is the most unfavorable season for strength and deformation of road base. The higher temperature in permafrost, the larger the peak value of displacement of subgrade top and slope toe, and the effect in slope is remarkable than the center point. Cold and hot slope embankment has obviously difference displacement in hot and cold slope under action of earthquake, and the hot slope side has higher instability risk than cold side.



Last Update: 2017-07-17