Abstract：To explore the response law of ground motion from surface to interior in different elevations of thick mountain, based on Lengzhuguan mountain, we establish a combination model of terrain and weathering medium using discrete element software. We input wenchuan seismic wave signals from the bottom boundary to reveal the internal and external dynamic response law of the slope on both sides of the mountain. The results show that, as elevation increases, the acceleration amplification coefficients in the body and surface of the side slope of Daduhe first increase, decrease, and then increase rapidly, reaching the maximum value near the top of the slope. The slope surface of Wasigou side is affected by topographic relief and the acceleration amplification coefficient of convex slope is enlarged and the concave slope is decreased. At different elevations, the acceleration amplification coefficient decreases gradually with the increase of slope depth from the surface to the interior, and the amplification curve tends to be gentle when it is 150-200 m away from the slope surface. As the elevation increases, the acceleration amplification coefficient decreases slowly from the outside to the inside, and the gentle convergence depth of the amplification curve increases. The wave velocity of rock mass medium decreases with the increase of rock mass differentiation and the resonance effect increases the acceleration response. Meanwhile, the combination effect of slope topography and medium makes the peak acceleration amplification coefficient of slope surface near 2.0.
MA Xiao,WANG Yunsheng,LUO Yonghong et al. Study on Ground Motion Response of Thick Mountain from Surface to Interior with Elevation Increase[J]. jgg, 2022, 42(12): 1288-1293.
