堆积层斜坡地震响应规律的虚拟试验分析
|
摘要
运用平面快速拉格朗日有限差分计算方法,研究了地震作用下攀田高速公路望江岭隧道出口堆积层斜坡的动力响应规律,就地震加速度幅值、频谱特性等相关参数对斜坡动力系统的影响进行了敏感性讨论,并进一步将虚拟试验计算结果与原型现场实测数据进行对比分析。结果表明:(1)输入地震加速度幅值特别是峰值强度的提高不仅对堆积体累积塑性变形具显著影响,且于堆积体稳定状态具有较强的扰动效应;(2)不同地震波动激励下,堆积层斜坡水平位移变化规律较大程度上依赖于所输入动载荷的固有属性;(3)峰值强度为0.49m/s2的Loma Prieta水平地震加速度作用20s末,数值虚拟试验结果与现场测斜同震相对位移在量值与分布趋势方面均较为接近。
Coseismic response regularity of the slope covered by deposits at exit of the Tianfang end of Wangjiangling tunnel of Panzhihua-Tianfang Motorway are studied with the 2-D fast Lagrangian finite difference method numerically,and the effects of amplitudes and spectrum characteristics of the input horizontal accelerations are also investigated,based on above mentioned researches,the relevant results of virtual tests are furthermore compared with the field monitoring data of the archetype slope.Simulation results reveal that:(1)both the cumulative plastic deformation and globe stability condition of the deposits are very sensitive to the amplitude especially the peak value of the input horizontal acceleration;(2)evolution rules of horizontal displacements of the deposits depend to a great extent on the intrinsic attributes of the earthquake loads;and(3)after continuous loadings of the Loma Prieta horizontal acceleration with peak value of 0.49 m/s2 and duration of 20 s,the coseismic relative longitudinal displacements corresponding to inclinometer borehole J3 in the numerical simulation are quite close to the field monitoring results in both the magnitude and distribution pattern.
Coseismic response regularity of the slope covered by deposits at exit of the Tianfang end of Wangjiangling tunnel of Panzhihua-Tianfang Motorway are studied with the 2-D fast Lagrangian finite difference method numerically,and the effects of amplitudes and spectrum characteristics of the input horizontal accelerations are also investigated,based on above mentioned researches,the relevant results of virtual tests are furthermore compared with the field monitoring data of the archetype slope.Simulation results reveal that:(1)both the cumulative plastic deformation and globe stability condition of the deposits are very sensitive to the amplitude especially the peak value of the input horizontal acceleration;(2)evolution rules of horizontal displacements of the deposits depend to a great extent on the intrinsic attributes of the earthquake loads;and(3)after continuous loadings of the Loma Prieta horizontal acceleration with peak value of 0.49 m/s2 and duration of 20 s,the coseismic relative longitudinal displacements corresponding to inclinometer borehole J3 in the numerical simulation are quite close to the field monitoring results in both the magnitude and distribution pattern.
引文
[1]崔鹏,何思明,姚令侃,等.汶川地震山地灾害形成机理与风险控制[M].北京:科学出版社,2011.
[2]卫宏,王兰生.川西山区公路边坡地质灾害研究[M].北京:煤炭工业出版社,2001.
[3]张华.堆积层斜坡的地震诱导行为研究[D].成都:西南交通大学,2011.
[4]胡定,张利民.土工抗震试验与分析[M].成都:成都科技大学出版社,1991.
[5]Seed H B.Considerations in the earthquakes-resistant design of earth and rockfill dams[J].Géotechnique,1979,29(3):215-263.
[6]何铮,徐卫亚,石崇,等.顺层岩质高边坡地震变形破坏机制三维数值反演研究[J].岩石力学与工程学报,2009,30(11):3512-3518.
[7]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.
[8]雷建成,高孟潭,俞言祥.四川及邻区地震动衰减关系[J].地震学报,2007,29(5):500-511.
[9]张华,游宏,陆阳.地震作用下斜坡堆积体的变形规律[J].公路交通科技,2014,31(1):50-54.
[10]四川省交通厅公路规划勘察设计研究院.攀枝花至田房(川滇界)高速公路K218+160~270段支挡工程工程地质勘查报告[R].成都:四川省交通厅公路规划勘察设计研究院,2006.
[11]Itasca Consulting Group Inc.FLAC2DUser’s Manual,Version 5.0[M].USA:Itasca Consulting Group Inc,2005.
[12]张华,陆阳,余建华.连续-离散介质动力耦合模型在斜坡堆积体地震响应分析中的应用[J].公路交通科技,2011,28(5):6-11.
[2]卫宏,王兰生.川西山区公路边坡地质灾害研究[M].北京:煤炭工业出版社,2001.
[3]张华.堆积层斜坡的地震诱导行为研究[D].成都:西南交通大学,2011.
[4]胡定,张利民.土工抗震试验与分析[M].成都:成都科技大学出版社,1991.
[5]Seed H B.Considerations in the earthquakes-resistant design of earth and rockfill dams[J].Géotechnique,1979,29(3):215-263.
[6]何铮,徐卫亚,石崇,等.顺层岩质高边坡地震变形破坏机制三维数值反演研究[J].岩石力学与工程学报,2009,30(11):3512-3518.
[7]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1714-1723.
[8]雷建成,高孟潭,俞言祥.四川及邻区地震动衰减关系[J].地震学报,2007,29(5):500-511.
[9]张华,游宏,陆阳.地震作用下斜坡堆积体的变形规律[J].公路交通科技,2014,31(1):50-54.
[10]四川省交通厅公路规划勘察设计研究院.攀枝花至田房(川滇界)高速公路K218+160~270段支挡工程工程地质勘查报告[R].成都:四川省交通厅公路规划勘察设计研究院,2006.
[11]Itasca Consulting Group Inc.FLAC2DUser’s Manual,Version 5.0[M].USA:Itasca Consulting Group Inc,2005.
[12]张华,陆阳,余建华.连续-离散介质动力耦合模型在斜坡堆积体地震响应分析中的应用[J].公路交通科技,2011,28(5):6-11.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心