|
|
|
| Non-uniform ground motion characteristics and influencing factors of valley site under oblique incidence of SH wave |
| ZHAO Leichao1, SONG Zhiqiang1, WANG Fei1, LIU Yunhe1, ZHANG Cunhui2 |
1.State Key Lab of Ecological Water Conservancy in Northwest Arid Area, Xi’an University of Technology, Xi’an 710048, China;
2.Changjiang Institute of Survey, Planning, Design and Research, Co., Ltd., Wuhan 420100, China |
|
|
|
Abstract Based on the indirect boundary integral equation method (IBIEM), the characteristics and distribution of ground motion on the surface of trapezoidal canyon under SH wave incidence were analyzed, and the influence mechanism of seismic wave oblique incidence Angle, slope slope, base width and site shear wave velocity on ground motion characteristics and non-uniform distribution was studied.The effect of canyon scattering on ground motion field at the truncated boundary of foundation under different shear wave velocities is deeply analyzed. The results show that with the increase of the angle of incidence, the amplification effect of the left slope increases gradually, and the more obvious the non-uniform distribution of ground motion on both sides of the bank. As the slope slows down, the amplification area caused by terrain scattering effect gradually expands to the right, and the seismic non-uniformity at the top and toe of the slope on both banks increases; With the increase of bottom width, the amplification area caused by terrain scattering effect gradually expands from right to side, the relative displacement of slope toe is sensitive to the change of bottom width, and the non-uniform characteristics of ground motion at both sides of slope toe are enhanced; When the wave velocity is small, the scattering effect of canyon is significant, and the maximum displacement of the left slope top is 1.45 times that of the right slope top, and the non-uniform characteristics of ground motion between the two banks is obvious. When truncating boundary input ground motion, the scattering effect of canyon topography should be fully considered, and the total field composed of free field and scattered field should be taken as the input to obtain reasonable and accurate ground motion input. •••••••
Key words: IBIEM; canyon topography; SH wave; non-uniform characteristic; Scattering effect
|
|
Received: 08 September 2021
Published: 15 December 2022
|
|
|
|
[1] Zhang Jian-min.Geotechnical aspects and seismic damage of the 156 m-high Zipingpu concrete-faced rockfill dam following the Ms 8.0 Wenchuan eearthquake[J].Soil Dynamics and Earthquake Engineering，2015，76:145-156.
[2] Trifunac M D.Scattering of plane SH waves by a semi-cylindrical canyon［J］．Earthquake Engineering and Structural Dynamics，1972，1(3)：267-281
[3] GAO Y，ZHANG N，LI D，et al.Effects of topographic amplification induced by a U-shaped canyo non seismic waves［J］．Bulletin of the Seismological Society of America，2012，102(4)：1748-1763
[4] ZHANG N，GAO Y，CAI Y，et al.Scattering of SH waves induced by a non-symmetrical V-shaped canyon［J］.Geophysical Journal International，2012，191(1)：243-256
[5] 梁建文，严林隽，李军伟等.圆弧形沉积河谷场地在平面P波入射下的响应[J].岩土力学，2001,22(2):138-143.
Liang Jian-wen，Yan Lin-jun，Li Jun-wei，et al.Response of circular-arc alluvial valleys under incident plane P waves[J].Rock and Soil Mechanics，2001，22(2):138-143.
[6] Zhang Zezhong，Fleurisson Jean Alain，Pellet Frederic.The effects of slope topography on acceleration amplification and interaction between slope topography and seismic input motion[J].Soil Dynamics and Earthquake Engineering，2017,113.
[7] Khoa-Van Nguyen，Behrouz Gatmiri.Evaluation of seismic ground motion induced by topographic irregularity[J].Soil Dynamics and Earthquake Engineering，2006，27(2).
[8] 孙纬宇,汪精河,严松宏,等.SV波斜入射下河谷地形地震动分布特征分析[J].振动与冲击,2019,38(20):237-243+265.
Sun Wei-yu，Wang Jing-he,Yan Song-hong,et.al.Characteristic analysis of ground motions of a canyon topography under obliquely incident SV waves[J].Journal of Vibration and Shock，2019，38(20):237-243+265.
[9] 尹超,李伟华,赵成刚.SV波斜入射下坡体地形放大效应的研究[J].振动工程学报,2020,33(05):971-984.
Yi Chao，Li Wei-hua，Zhao Cheng-gang.Research of slope topographic amplification subjected to obliquely incident SV-waves[J].Journal of Vibration Engineering，2020，33(05):971-984.
[10] 周国良,李小军,侯春林,等.SV波入射下河谷地形地震动分布特征分析[J].岩土力学,2012,33(04):1161-1166.
Zhou Guo-liang，Li xiao-Jun，Hou Chun-lin，et al.Characteristic analysis of ground motions of canyon topography under incident SV seismic waves[J].Rock and Soil Mechanics，2012，33(04):1161-1166.
[11] SANCHEZ-SESMA.Ground motion at canyons of arbitraty shape under incident SH waves[J].Earthquake Engineering and Structural Dynamics,1979,7:441-450
[12] M.Panji,M.Kamalian,J.Asgari Marnani.Transient analysis of wave propagation problems by half-plane BEM[J] Geophysical Journal International,2013,194,1849–1865
[13] Ali Seiphoori,S Mohsen Haeri,Masoud Karimi.Three-dimensional nonlinear seismic analysis of concrete faced rockfill dams subjected to scattered P SV and SH waves considering the dam-foundation interaction effects[J]. Soil Dynamics and Earthquake Engineering,2011,31(5).
[14] 何建涛,马怀发,张伯艳,陈厚群.黏弹性人工边界地震动输入方法及实现[J].水利学报,2010,41(08):960-969.
He Jian-tao，Ma Huai-fa，Zhang Bo-yan，et al.Method and realization of seismic motion input of viscous-spring boundary[J].Journal of Hydraulic Engineering,2010，41(8):960-969.
[15] 王飞. 近断层地震动斜输入作用下水电站厂房非线性地震响应研究[D].西安理工大学,2019.
Wang Fei.Nonlinear seismic responses of a hydropower house under near-fault ground motions oblique input[D].Xian:Xi’an University of Technology，2019.
[16] 王飞,宋志强,刘云贺,等.SV波斜入射不同自由场构建方法下水电站地面厂房地震响应研究[J].振动与冲击,2021,40(07):9-18.
Wang Fei,，Song Zhi-qiang，Liu Yun-he，et al.Seismic response of ground powerhouse of hydropower station based on different free field construction methods with oblique incidence of SV wave[J].Journal of Vibration and Shock,2021,40(07):9-18.
[17] 张梁,朱海涛,梁建文,等.基于黏弹性边界的P波斜入射波场分解方法精度比较[J].地震工程与工程振动，2020，40(02):177-186.
Zhang Liang，Zhu Hai-tao，Liang Jian-wen，et al.Precision comparison of different field decomposition methods of oblique incidence of P wave based on viscoelastic boundary[J].Earthquake Engineering and Engineering Dynamics，2020，40(02):177-186. |
| [1] |
. [J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(1): 35-. |
|
|
|
|
