新岩滑坡地震与交通动荷载响应分析
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摘要
为了研究动荷载对滑坡稳定性的影响,以吉林省在建汪延高速公路上的新岩滑坡为依托,借助GeoS-tudio软件建立有限元模型,输入不同峰值加速度的地震荷载与模拟交通震动荷载,通过滑坡稳定性系数的变化来研究2种动荷载对滑坡的影响。通过加荷前后的对比发现,施加动荷载后滑坡稳定性系数均大大降低,并且施加交通震动荷载后稳定性系数下降值略大于施加地震荷载后的下降值。由此可知,在该滑坡中这2种动荷载对滑坡内应力及稳定性影响较大,特别是交通震动荷载对其稳定性影响更大。研究结果可为公路滑坡在震动荷载作用下的稳定性评价及支护设计提供一定的参考依据。
To research the effects of dynamic loads on landslide stability,based on the Xinyan landslide on the Wangyan highway in Jilin Province,a finite element model was established with the help of GeoStudio,then earthquake loads with different PGAs and traffic vibration loads were input.The influence of these dynamic loads on landslide was reflected through the changes of landslide stability coefficient.Through comparing before and after the inputs,it was found that stability coefficient of landslide decreased under dynamic loads and the decrease value under the traffic vibration loads was larger than that under the earthquake loads.Therefore,it can be concluded that the landslide stress and stability are greatly influenced by these two dynamic loads,and especially the influence of traffic vibration loads is larger.The results can provide certain reference for stability evaluation and supporting design of highway landslide under dynamic loads.
To research the effects of dynamic loads on landslide stability,based on the Xinyan landslide on the Wangyan highway in Jilin Province,a finite element model was established with the help of GeoStudio,then earthquake loads with different PGAs and traffic vibration loads were input.The influence of these dynamic loads on landslide was reflected through the changes of landslide stability coefficient.Through comparing before and after the inputs,it was found that stability coefficient of landslide decreased under dynamic loads and the decrease value under the traffic vibration loads was larger than that under the earthquake loads.Therefore,it can be concluded that the landslide stress and stability are greatly influenced by these two dynamic loads,and especially the influence of traffic vibration loads is larger.The results can provide certain reference for stability evaluation and supporting design of highway landslide under dynamic loads.
引文
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[2]晏鄂川,刘汉超,唐辉明.滑带土动力学性质试验研究[J].工程地质学报,2003,11(3):318-322.
[3]校小娥.地震作用下滑坡稳定性分析[D].成都:西南交通大学,2010.
[4]徐佩华,陈剑平,阙金声,等.基于人工神经网络的三峡水库库岸稳定性分级[J].吉林大学学报:地球科学版,2007,37(3):564-569.
[5]徐佩华,石丙飞,陈剑平,等.城市某人工高边坡整体稳定性的可靠性分析[J].工程地质学报,2006,14(增):163-167.
[6]徐佩华,陈剑平,石丙飞,等.人工边坡潜在滑动面研究——以广州科学城某人工高边坡为例[J].吉林大学学报:地球科学版,2008,38(5):825-830.
[7]杨静,陈剑平,王吉亮.均匀设计与灰色理论在边坡稳定性分析中的应用[J].吉林大学学报:地球科学版,2008,38(4):654-658.
[8]蔡汉成,言志信,王群敏,等.交通荷载作用下边坡动力响应数值分析[J].西北地震学报,2010,32(3):220-225.
[9]中国地震局.GB18306—2001中国地震动参数区划图[S].北京:中国标准出版社,2001.
[10]黄哲兴,王绍平.城市道路路基填筑中杂填土的处理[J].福建建筑,2004(3):83-84.
[11]张娇娜,李士辉,阚文广.深挖路堑边坡稳定性数值模拟分析[J].黑龙江交通科技,2010,33(6):1-3.
[12]朱维伟.全强风化泥岩高边坡稳定性分析方法研究[J].林业建设,2009(4):31-34.
[13]中华人民共和国建设部.GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[14]卜鑫.交通荷载下软土路基的动力响应分析[D].杭州:浙江大学,2006.
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