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为了研究路堤在地震作用下的易损性特点和挡土墙对路堤震害易损性的影响,选取连云港—霍尔果斯高速公路西安—宝鸡段K1125+470处路堤进行理论性震害易损性评价。通过划分路堤震害等级,选取路堤震害损伤参数,建立了路堤震害等级与路堤震害损伤参数之间的对应关系;采用Flac软件建立了无挡土墙和有挡土墙路堤的有限差分模型,选取实际记录地震动进行了增量动力分析,明确了一定地震动峰值加速度作用下无挡土墙和有挡土墙路堤震害损伤参数的取值规律;采用概率性地震需求分析方法研究了路堤发生各等级震害的概率,绘制了路堤震害易损性曲线,并将无挡土墙和有挡土墙路堤的震害易损性评价结果进行对比。研究结果表明:地震动峰值加速度为1.2g时,无挡土墙和有挡土墙路堤发生毁坏的概率比地震动峰值加速度为1.0g时平均高16.854%和76.679%,比地震动峰值加速度为0.8g时平均高95.895%和88.008%,即无论有无挡土墙,地震动峰值加速度越大,路堤发生更严重等级震害的概率越大;超越概率为30%、50%和80%时,有挡土墙路堤发生毁坏时对应的地震动峰值加速度比无挡土墙路堤平均高17.93%、18.14%和18.34%,即在相同地震作用下,有挡土墙路堤的震害状况低于无挡土墙路堤,说明挡土墙对提高路堤抗震性能具有积极作用。
In order to study the vulnerability of embankments under earthquake and the influence of retaining walls on the vulnerability of embankments, the theoretical damage to the embankment of K1125 + 470 embankment of Xi’an-Baoji Section of Lianyungang-Horgos Expressway Loss assessment. By dividing the grade of embankment damage and selecting the damage parameters of embankment, the corresponding relationship between the grade of embankment damage and the damage parameters of embankment is established. The finite difference of non-retaining wall and embankment with retaining wall is established by using Flac software Model, the incremental dynamic analysis of actual recorded earthquakes is made, and the law of value of the damage damage parameters of the embankment without retaining wall and the retaining wall under a certain earthquake peak acceleration is clarified. Probabilistic seismic demand analysis The probability of damage to the embankment at all levels was plotted and the vulnerability curve of the embankment was plotted. The vulnerability assessment results of the non-retaining walls and the embankments with retaining walls were compared. The results show that the probability of failure of the embankment without retaining wall and the retaining wall is 16.854% and 76.679% higher than the peak acceleration of 1.0g when the peak acceleration of ground motion is 1.2g. The peak acceleration of ground motion is 0.8g, the average high 95.895% and 88.008%, that is with or without retaining wall, the greater the peak acceleration of ground motion, the greater the probability of embankment occurred more serious damage; the probability of exceeding 30%, 50% and 80% , The corresponding peak ground acceleration of retaining wall with embankment failure is 17.93%, 18.14% and 18.34% higher than that of non-retaining wall embankment, that is, under the same earthquake, the damage condition of embankment with retaining wall is lower than No retaining wall embankment, indicating that the retaining wall to improve the seismic performance of the embankment has a positive effect.