关键词: 路基工程, 震害模式, 振动台模型试验, 路堤抗震性能, 动力特性

Abstract:

To study the seismic damage mode and dynamic characteristics of road embankment, firstly, the road embankment seismic damage of Wenchuan Earthquake is investigated finding out that the main seismic damage type of road embankment is rip of upside and bulge of downside of the slope. Road embankment seismic damage is associated with seismic intensity, revetment measures, and reinforcement measures of road embankment noumenon closely, and has no significant relation with embankment height and crossfall of the ground. By means of shaking table model test and numerical simulation, it is found out that the magnitude and the increment of acceleration and dynamic shear stress are the largest in the upside of the road embankment, which is in the same position of the rip. Also, dynamic earth pressure and displacement are the largest above the berm, which is in the same position of bulge. All of rip and bulge are in the depth of 3 m, which show that the road embankment damage is a superficial zone damage. By dynamic numerical analysis finding out that magnification factor of peak ground acceleration (PGA) shows three types: monotone increasing as the height increases (h <10 m), increasing to decreasing and later increasing again as the height increases (h >20 m), and the form lies between the formers (10 m

Key words: subgrade engineering, seismic damage mode, shaking table model test, embankment aseismic capability, dynamic characteristics