黄土路堑边坡在振动作用下的动力响应分析
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摘要
研究目的:在黄土路堑基底加固中采用柴油柱锤打桩机产生振动的条件下,测试柱锤振动对黄土路堑边坡的动力响应,分析研究动力响应在水平地面与边坡上的差别,查找施工过程中黄土边坡坍塌的外在动力因素。研究结论:黄土路堑边坡在振动作用下的动力响应存在明显的放大效应,尤其是边坡的变坡点的动力响应明显强于自由场(水平地形)的动力响应,并随边坡的增高而逐渐衰减,但衰减速度较水平地面上缓慢得多。这种地形对振动产生的动力放大效应是引发黄土路堑边坡坍塌的重要因素之一,因此,在处理路堑基底时,应考虑边坡的临时防护与加固,确保施工过程中的稳定与安全。
Research purposes:The tests of the dynamic responses of the loess slope excited by pile hammer vibrations are done and the analyses of the difference of dynamic response between level ground and side slope are made for the purpose of finding out the external dynamic factors for collapse of side slope in construction.Research conclusions:The loess slope has strong dynamic responses to the construction vibrations,and especially,the dynamic responses of the crest part of the slope are much stronger than that of the free field(horizontal surface).The topographic amplification effects should be one of the potential factors for the collapse of loess slope in the foundation reinforcement process.Therefore,to ensure the stability of the slope and construction safety,it is very important to take temporary reinforcement measure for loess slope.
Research purposes:The tests of the dynamic responses of the loess slope excited by pile hammer vibrations are done and the analyses of the difference of dynamic response between level ground and side slope are made for the purpose of finding out the external dynamic factors for collapse of side slope in construction.Research conclusions:The loess slope has strong dynamic responses to the construction vibrations,and especially,the dynamic responses of the crest part of the slope are much stronger than that of the free field(horizontal surface).The topographic amplification effects should be one of the potential factors for the collapse of loess slope in the foundation reinforcement process.Therefore,to ensure the stability of the slope and construction safety,it is very important to take temporary reinforcement measure for loess slope.
引文
[1]TB 10035—2006,铁路特殊路基设计规范[S].
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[4]杨昌义.郑西客运专线三门峡段黄土工程地质特征及设计参数探讨[J].铁道勘察,2005(3):54-56.
[5]胡聿贤.地震工程学[M].北京:地震出版社,1988.
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[7]Robert E.Sheriff,Lloyd P.Geldart.Exploration Seismology[M].London:Cambridge University Press,1995.
[2]姚姚.地震波场与地震勘探[M].北京:地质出版社,2006.
[3]祁生文,伍法权,等.边坡动力响应规律研究[J].中国科学E辑技术科学,2003(增刊):28-40.
[4]杨昌义.郑西客运专线三门峡段黄土工程地质特征及设计参数探讨[J].铁道勘察,2005(3):54-56.
[5]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[6]陈仲候,等.工程与环境物探教程[M].北京:地质出版社,2005.
[7]Robert E.Sheriff,Lloyd P.Geldart.Exploration Seismology[M].London:Cambridge University Press,1995.
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