Monitoring Result Analysis of Lenzhuguan Slope Ground Shock Response of Lushan Earthquake of Sichuan, China
详细信息
- 责任者：Luo Yonghong (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Wang Yunsheng
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(3)
- 关键词：大震 ; great earthquakes ; 地震响应 ; seismic response ; 四川 ; Sichuan Province
- 页码：p.232-241
- 图表：illus., 4 tables, 15 refs.
- 分类号：0500
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
Adits were excavated in different parts of the slopes on both banks of the Luding Lengzhuguan valley and the earthquake monitoring instruments were placed in the adits in order to obtain the data on the Lushan Ms7.0 strong earthquake.This paper researches the seismic response characteristics and topographic amplification effect from the monitoring points on the slopes.According to the Lushan main earthquake data recorded by the 7 seismic instruments on both banks of the valley,the horizontal component PGA of No.1 monitoring point on the right bank was 1.635 m/s2 and the vertical component PGA was 0.667 m/s2,obviously higher than PGA(0.110~0.424 m/s2) of the other monitoring points.By reference to the main shock records from the Guza strong earthquake monitoring station in Kangding,the PGA amplification factor of No.1 monitoring point reaches 6.9,and the Arias intensity enlarges several ten times.The horizontal to vertical spectral ratio shows that on the right bank of Lenzhuguan valley,the topographic amplification factor of the horizontal component from No.1 monitoring point reaches 9.0,the topographic amplification factor from No.2 monitoring point is 3.5,and the topographic amplification factors from No.4~No.7 monitoring points on the left bank are 1.0~3.0.The studies suggest that under a strong earthquake,the topographic amplification effect from ground shocks of thin ridges on the right bank of the Lenzhuguan valley is significantly stronger than that of the middle-high slopes on the left bank.And the convex topography from No.1 monitoring point is the maximum amplification.With the amplification of amplitude values,the strong vibration energy sharply increases in the effect of several ten times.When the accumulation of the vibration energy in a short period of time excesses or far excesses the strength of the rock mass,it is easy to form shatter,collapses,landslides and the projection effect of high and steep landforms.
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