交通荷载作用下边坡动力响应数值分析

Numerical Analysis of Slope Dynamic Response under Traffic Loads

摘要:

利用岩土数值分析软件FLAC2D6.0对边坡岩土体在不同交通荷载作用下动力响应做了数值分析。结果表明:在交通荷载作用下,岩土体的振动加速度在震源附近最大,沿坡面向上以及向内水平向逐渐减小;离震源越近衰减越快,随着距离增大而逐渐变慢,并且交通荷载越大衰减的幅度越大;路面以上边坡岩土体垂直加速度和水平加速度处于同一量级,垂直加速度大于水平加速度;路面以下加速度比路面以上大一个量级,水平加速度和垂直加速度处于同一量级,并且水平加速度大于垂直加速度。研究结果对于评价交通荷载对边坡岩土体的影响及边坡的加固与治理具有一定的理论意义和工程应用价值。

Abstract:

Numerical analysis of the dynamic response for rock-soil mass slope under different traffic loads is made, using numerical analysis of geoteehnical software FLAC2D6.0. The result indicates that under traffic loads, the vibration acceleration of rock-soil mass near seismic source is the maximum, up along slope or inner slope in horizontal direction it decreases gradually. Near seismic source , the vibration at- tenuation is more intense, and it gets more weak as distance increases. The heavier the traffic load is the bigger the attenuating range is. Above the road the vertieal acceleration and the horizontal acceleration in slope are in same magnitude, and the vertical one is bigger than the horizontal one. The magnitude below the road is bigger than one above the road, the vertical acceleration and the horizontal acceleration are in same magnitude, and the horizontal one is bigger than the vertical one also. The results have some theo- retical significance and project application for evaluating the influence acting of traffic loads on rock-soil mass slope and considering how to reinforce and govern the slope under traffic loads.