ANSYS在岩质边坡动力响应分析中的应用
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摘要
在动力有限元理论的基础上运用ANSYS软件对不同高度和坡度的岩质边坡进行了模态分析和地震加速度时程分析,发现了一些新的动力响应规律和现象。模态分析显示:随坡高的增加边坡的自振频率呈降低的趋势;而坡度变化对其影响则具有相反的规律。通过地震加速度时程分析发现:边坡的位移、速度、加速度反应三量具有相似的响应规律;随坡高的增加坡顶位移时程曲线振幅增大,但达到一定高度时(约200m)则变化较小,同时坡顶处的地震动响应相对于坡脚处出现了明显的滞后现象;坡度增加时坡顶位移呈线性增加的趋势;地震波的衰减效应与边坡对其的放大效应是同时存在的。研究结果对边坡的抗震设计具有一定的借鉴意义。
On the basis of dynamics finite elements theory,rocky slopes with different height and gradiant are computed in the process of modol analysis and time-dependent analysis of seismic acceleration by ANSYS software.Some new dynamic response laws and phenomena are found through the research.The modol analysis shows that the natural vibration frequency of slope dropped as rising of slope height;while the changes of slope angle acts contrary to the natural vibration frequency.Time-dependent analysis of seismic acceleration also indicates that the displacement,speed and acceleration of slope response in the similar way.The amplitude of time-dependent curve of slope crest displacement evidently increase as the increasing of the slope height,nevertheless,the slope crest displacement changes slightly when the slope height reaches a certain degree(about 200 m),meanwhile,the ground motion responsed at the slope crest has a obvious hysteresis comparing to the slope foot.Furthermore,the slope crest displacement has a linear upward trend with the increasing in slope gradiant,besides,the attenuation effect of seismic wave and the amplification effect of slope exists at the same time.The results would have a great reference value to aseismic design of slope.
On the basis of dynamics finite elements theory,rocky slopes with different height and gradiant are computed in the process of modol analysis and time-dependent analysis of seismic acceleration by ANSYS software.Some new dynamic response laws and phenomena are found through the research.The modol analysis shows that the natural vibration frequency of slope dropped as rising of slope height;while the changes of slope angle acts contrary to the natural vibration frequency.Time-dependent analysis of seismic acceleration also indicates that the displacement,speed and acceleration of slope response in the similar way.The amplitude of time-dependent curve of slope crest displacement evidently increase as the increasing of the slope height,nevertheless,the slope crest displacement changes slightly when the slope height reaches a certain degree(about 200 m),meanwhile,the ground motion responsed at the slope crest has a obvious hysteresis comparing to the slope foot.Furthermore,the slope crest displacement has a linear upward trend with the increasing in slope gradiant,besides,the attenuation effect of seismic wave and the amplification effect of slope exists at the same time.The results would have a great reference value to aseismic design of slope.
引文
[1]李天斌,王兰生.岩质工程高边坡稳定性及其控制[M].北京:科学出版社,2008.
[2]王存玉,王思敬.地震条件下二滩水库岸坡稳定性研究[A]∥岩体工程地质力学问题(七)[G].北京:科学出版社,1987:5-74.
[3]梁庆国,韩文峰,赵士耀.垂直向地震作用对节理岩体失稳破坏的影响[J].西北地震学报,2007,29(4):307-313.
[4]郭俊英,石玉成.地震动特性对黄土斜坡稳定性的影响分析[J].西北地震学报,2004,26(3):250-254.
[5]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[6]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.
[7]秋仁东,石玉成,付长华.高边坡在水平动荷载作用下的动力响应规律研究[J].世界地震工程,2007,23(2):131-138.
[8]秋仁东,石玉成,徐舜华,等.预应力锚索加固石窟岩体的地震动力响应研究[J].西北地震学报,2007,29(1):49-53.
[9]梁力,王伟,李明.某露天矿岩质高边坡地震动力响应及稳定性分析[J].金属矿山,2008,(8):20-25.
[10]任自铭,姚令侃.坡面形态对地震作用下土质边坡稳定性影响[J].路基工程,2008,(5):5-7.
[11]洪海春,徐卫亚.地震作用下岩质边坡稳定性分析综述[J].岩石力学与工程学报,2005,24(1):4827-4836.
[12]陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台试验--试验结果分析[J].地震工程与工程振动,2007,27(1):164-170.
[13]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2797.
[2]王存玉,王思敬.地震条件下二滩水库岸坡稳定性研究[A]∥岩体工程地质力学问题(七)[G].北京:科学出版社,1987:5-74.
[3]梁庆国,韩文峰,赵士耀.垂直向地震作用对节理岩体失稳破坏的影响[J].西北地震学报,2007,29(4):307-313.
[4]郭俊英,石玉成.地震动特性对黄土斜坡稳定性的影响分析[J].西北地震学报,2004,26(3):250-254.
[5]祁生文,伍法权,严福章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007.
[6]徐光兴,姚令侃,李朝红,等.边坡地震动力响应规律及地震动参数影响研究[J].岩土工程学报,2008,30(6):918-923.
[7]秋仁东,石玉成,付长华.高边坡在水平动荷载作用下的动力响应规律研究[J].世界地震工程,2007,23(2):131-138.
[8]秋仁东,石玉成,徐舜华,等.预应力锚索加固石窟岩体的地震动力响应研究[J].西北地震学报,2007,29(1):49-53.
[9]梁力,王伟,李明.某露天矿岩质高边坡地震动力响应及稳定性分析[J].金属矿山,2008,(8):20-25.
[10]任自铭,姚令侃.坡面形态对地震作用下土质边坡稳定性影响[J].路基工程,2008,(5):5-7.
[11]洪海春,徐卫亚.地震作用下岩质边坡稳定性分析综述[J].岩石力学与工程学报,2005,24(1):4827-4836.
[12]陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台试验--试验结果分析[J].地震工程与工程振动,2007,27(1):164-170.
[13]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2797.
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