土岩界面地震波能量传递与耗散特性研究——以汶川8.0级地震为例
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摘要
以汶川8.0级地震为例,应用应力波在弹性介质界面能量分配与反射和透射系数之间的相关性,得出地震波在不同介质中滞留能量的耗散比与介质波阻抗比和上层介质能量衰减比之间的关系。通过离散数值计算发现当能量衰减比一定时,两种介质的波阻抗比在某一特定值时上层介质滞留能量耗散比达到最大,该值随着能量衰减比的增大而增大。这一结论对地震山区的"剥皮型"滑坡提供了一种全新的解释,并得到了路堤工程宏观震害与面波测试资料的验证。
Based on the correlation between stress wave energy distribution in the elastic medium and interface reflection and transmission coefficients,we obtained the relations between Stranded & dissipation ratio of seismic waves energy in different media and wave impedance ratio of the media and attenuation ratio in upper-medium.By discrete numerical calculation,it is found that if the attenuation ratio is certain,the energy attenuation ratio of upper-medium will get the maximum stay when wave impedance of two medium at a given value,of which a certain value increases with the attenuation ratio increase compared within a certain range.This conclusion provides a new explanation of "barking-type" landslide in mountain areas of earthquake.It is verified by macroscopic damage of embankment and the data of surface wave test.
Based on the correlation between stress wave energy distribution in the elastic medium and interface reflection and transmission coefficients,we obtained the relations between Stranded & dissipation ratio of seismic waves energy in different media and wave impedance ratio of the media and attenuation ratio in upper-medium.By discrete numerical calculation,it is found that if the attenuation ratio is certain,the energy attenuation ratio of upper-medium will get the maximum stay when wave impedance of two medium at a given value,of which a certain value increases with the attenuation ratio increase compared within a certain range.This conclusion provides a new explanation of "barking-type" landslide in mountain areas of earthquake.It is verified by macroscopic damage of embankment and the data of surface wave test.
引文
[1]许强.汶川大地震诱发地质灾害类型及主要特征研究[J].地质灾害与环境保护,2009,20(2):86-93.
[2]戴俊.岩石动力学特性与爆破理论[M].北京:冶金工业出版社,2002:58-67.
[3]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002:14-15,44-60.
[4]王建,姚令侃,蒋良潍.地震作用下土体变形破坏模式与机理[J].西南交通大学学报,2010,45(2):196-202.
[5]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩土力学与工程学报,2009,28(6):1239-1249.
[6]冯文凯,许强,黄润秋.斜坡震裂变形力学机制初探[J].岩土力学与工程学,2009,28(1):3124-3130.
[7]交通部公路规划设计院.JTJ00489公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[8]冯俊德,姚令侃,杨明.汶川地震路基工程震害分析及对抗震规范改进的启示[J].西南交通大学学报,2009,43(3):301-311.
[2]戴俊.岩石动力学特性与爆破理论[M].北京:冶金工业出版社,2002:58-67.
[3]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002:14-15,44-60.
[4]王建,姚令侃,蒋良潍.地震作用下土体变形破坏模式与机理[J].西南交通大学学报,2010,45(2):196-202.
[5]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩土力学与工程学报,2009,28(6):1239-1249.
[6]冯文凯,许强,黄润秋.斜坡震裂变形力学机制初探[J].岩土力学与工程学,2009,28(1):3124-3130.
[7]交通部公路规划设计院.JTJ00489公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[8]冯俊德,姚令侃,杨明.汶川地震路基工程震害分析及对抗震规范改进的启示[J].西南交通大学学报,2009,43(3):301-311.
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