

浏览全部资源
扫码关注微信
1.苏州科技大学,江苏省结构工程重点实验室,江苏 苏州 215009
2.中国地震局工程力学研究所,黑龙江 哈尔滨 150080
Published:28 February 2022
移动端阅览
刘启方,李家祥,温瑞智.SV波入射下斜坡地形对上覆土层地震动放大的影响研究[J].防灾减灾工程学报,2022,42(01):92-99.
LIU Qifang,LI Jiaxiang,WEN Ruizhi.Study on the Effect of Ground Motion Amplification of Slope Topography to Overlying Soil Layer under Incident SV Waves[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):92-99.
刘启方,李家祥,温瑞智.SV波入射下斜坡地形对上覆土层地震动放大的影响研究[J].防灾减灾工程学报,2022,42(01):92-99. DOI: 10.13409/j.cnki.jdpme.202001026.
LIU Qifang,LI Jiaxiang,WEN Ruizhi.Study on the Effect of Ground Motion Amplification of Slope Topography to Overlying Soil Layer under Incident SV Waves[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):92-99. DOI: 10.13409/j.cnki.jdpme.202001026.
针对上覆土层斜坡场,利用显式有限元方法,定量分析SV波入射下地震动的放大与斜坡角度、覆盖层的厚度以及覆盖层与下卧基岩阻抗比的关系。研究表明,当斜坡角度大于60°、覆盖土层厚度大于1/4斜坡高度时,在离坡顶点两倍斜坡高度以内,存在一个较一维土层明显的放大区域。在这一区域内,放大倍数最大值位于坡顶点,放大倍数随斜坡角度和土层厚度的增加而增大,随到坡顶点距离的增大和土层与基岩阻抗比的增大而减少。当土层与基岩阻抗比较低时,最大放大倍数可达一维土层的2.3倍。在这一区域内,斜坡地形土层基本频率约为一维土层的0.8~0.95倍。当斜坡角度<45°或覆盖层厚度小于斜坡高度的1/4时,斜坡对一维土层放大的影响显著下降。还利用最小二乘法和数值模拟结果拟合了显著放大区域的放大倍数与斜坡角度、覆盖层的厚度以及阻抗比的简单估计关系式。结果可为上覆土层的斜坡场地地震动参数的选择提供一定的参考。
The relationships between the amplification of ground motion and the slope angle, the thickness of soil layer and the impedance ratio between soil and bedrock under inclined SV waves for a slope topography site are analyzed in this paper by the explicit finite element method. The study show that when the slope angle was larger than 60°, and the soil depth larger than one-quarter of the slope height, within twice the height of the slope from the slope crest, there exists an obvious amplification area compared with the one-dimensional soil layer. In this region, the amplification factor increases with the increase in slope angle and soil layer thickness, but decreases with the increase in distance to the crest of the slope and the increase in impedance ratio between soil layer and bedrock. In this region, the basic frequency of topographical slope soil is between 0.8 and 0.95 times that of one-dimensional soil. When the slope angle was smaller than 45°, or the soil depth was smaller than one-quarter of the slope height, the effect of the slope topography on soil amplification decreased significantly. At the same time, an estimated relation between amplification factor and slope angle, thickness of soil layer and impedance ratio in this area is fitted by the least square method using the numerical simulation results. The results of this paper can provide some references for the selection of ground motion parameters of the slope topography with the overlying soil layer.
Boore D M . Note on the effect of topography on seismic SH waves [J]. Bulletin of the Seismological Society of America , 1972 , 62 : 275 ‑ 284 .
Celebi M . Topographical and geological amplifications determined from strong–motion and aftershock records of the 3 March 1985 Chile earthquake [J]. Bulletin of the Seismological Society of America , 1987 , 77 : 1147 ‑ 1157 .
Ashford S A , Sitar N . Seismic response of steep natural slopes [R]. Berkeley : University of California at Berkeley , 1994 .
唐晖 , 李小军 , 李亚琦 . 自贡西山公园山脊地形场地效应分析 [J]. 振动与冲击 2012 , 31 ( 8 ): 74 ‑ 79 .
Tang H , Li X J , Li Y Q . Site effect of topography on ground motions of Xishan Park of Zigong City [J]. Journal of Vibration and Shock , 2012 , 31 ( 8 ): 74 ‑ 79 . (in Chinese)
杨宇 , 李小军 , 贺秋梅 . 自贡西山公园山脊场地地形和土层效应数值模拟 [J]. 震灾防御技术 , 2011 , 6 ( 4 ): 436 ‑ 447 .
Yang Y , Li X J , He Q M . Numerical simulation for site effect of ridge terrain and overlaying soil in Zigong XisHan Park [J]. Technology for Earthquake Disaster Prevention , 2011 , 6 ( 4 ): 436 ‑ 447 . (in Chinese)
温瑞智 , 任叶飞 , 齐文浩 , 等 . 2013年4月20日芦山地震最大加速度记录分析 [J]. 西南交通大学学报 , 2013 , 48 ( 5 ): 783 - 791 .
Wen R Z , Ren Y F , Qi W H , et al . Maximum acceleration recording from Lushan earthquake on April 20,2013 [J]. Journal of Southwest Jiaotong University , 2013 , 48 ( 5 ) : 783 ‑ 791 . (in Chinese)
刘晶波 . 局部不规则地形对地震地面运动的影响 [J]. 地震学报 , 1996 , 18 ( 2 ): 239 ‑ 245 .
Liu J B . The effect of local irregular topography on the seismic ground motion [J]. Acta Seismologica Sinica , 1996 , 18 ( 2 ): 239 ‑ 245 . (in Chinese)
荣棉水 , 李小军 , 吕悦军 , 等 . 平台地形对地震地面运动特征频率值的影响 [J]. 中国地震 , 2009 , 25 ( 2 ): 178 ‑ 185 .
Rong M S , Li X J , Lyu Y J , et al . Effect of protruding topography on characteristic period of ground motion [J]. Earthquake Research in China , 2009 , 25 ( 2 ): 178 ‑ 185 . (in Chinese)
周红 , 高孟潭 , 俞言祥 . SH 波地形效应特征的研究 [J]. 地球物理学进展 , 2010 , 25 ( 3 ): 775 ‑ 782 .
Zhou H , Gao M T , Yu Y X . A study of topographical effect on SH waves [J]. Progress in GeopHysics , 2010 , 25 ( 3 ): 775 ‑ 782 . (in Chinese)
张建毅 , 薄景山 , 王振宇 , 等 . 汶川地震局部地形对地震动的影响 [J]. 自然灾害学报 , 2012 , 21 ( 3 ): 164 - 169 .
Zhang J Y , Bo J S , Wang Z Y , et al . Influence of local topography on seismic ground motion in Wenchuan earthquake [J]. Journal of Natural Disasters , 2012 , 21 ( 3 ): 164 ‑ 169 . (in Chinese)
郝明辉 , 张郁山 . 凸起地形对地震动特性的影响 [J]. 地震学报 , 2014 , 36 ( 5 ): 883 ‑ 894 .
Hao M H , Zhang Y S . Analysis of terrain effect on the properties of ground motion [J]. Acta Seismologica Sinica , 2014 , 36 ( 5 ): 883 ‑ 894 . (in Chinese)
张宁 , 高玉峰 , 代登辉 , 等 . 风化半圆形河谷引起的土层与地形放大效应 [J]. 防灾减灾工程学报 , 2017 , 37 ( 1 ): 1 - 8 .
Zhang N , Gao Y F , Dai D H , et al . Soil and topography amplification effects by a weathered semi-circular canyon [J]. Journal of Disaster Prevention and Mitigation Engineering . 2017 , 37 ( 1 ): 1 - 8 . (in Chinese)
Geli L , Bard P Y , Jullien B . The effect of topography on earthquake ground motion: a review and new results [J]. Bulletin of the Seismological Society of America , 1988 , 78 : 42 ‑ 63 .
Bard P Y . Local effects on strong ground motion: physical basis and estimation methods in view of microzoning studies [C]∥ Proceeding of Advanced Study Course “Seismotectonic and Microzonation Techniques in Earthquake Engineering” , Kefallinia, Greece : [s.n.] , 1999 : 127 ‑ 218 .
Boore D M , Harmsen S C , Harding S T . Wave scattering from a step change in surface topography [J]. Bulletin of the Seismological Society of America , 1981 , 71 ( 1 ): 117 ‑ 125 .
Ashford S A , Sitar N , Lysmer J , et al . Topographic effects on the seismic response of steep slopes [J]. Bulletin of the Seismological Society of America , 1997 , 87 ( 3 ), 701 ‑ 709 .
丁海平 , 于彦彦 , 郑志法 . P波斜入射陡坎地形对地面运动的影响 [J]. 岩土力学 , 2017 , 38 ( 6 ): 1716 ‑ 1724 .
Ding H P , Yu Y Y , Zheng Z F . Effects of scarp topography on seismic ground motion under inclined P wave [J]. Rock and Soil Mechanics , 2017 , 38 ( 6 ): 1716 ‑ 1724 . (in Chinese)
Assimaki D , Kansel E . Effects of local soil conditions on the topographic aggravation of seismic motion: parametric investigation and recorded field evidence from the 1999 Athens Earthquake [J]. Bulletin of the Seismological Society of America , 2005 , 95 ( 3 ): 1059 ‑ 1089 .
廖振鹏 . 工程波动理论导论 [M]. 北京 : 科学出版社 , 2002 .
Liao Z P . Introduction to wave motion theories for engineering [M]. Beijing : Science Press , 2002 . (in Chinese)
建筑抗震设计规范 : GB 50011—2010 [S]. 北京 : 中国建筑工业出版社 , 2010 .
0
Views
0
下载量
2
CSCD
Publicity Resources
Related Articles
Related Author
Related Institution
苏公网安备32010202012147号