近水平岩层阶状斜坡地震动响应特征分析

川南中低山地区近水平岩层侵蚀台地阶状斜坡普遍发育且主要为居住区,研究这类阶状斜坡的地震动响应对揭示珙县地区震后崩塌山体灾害发育的动力机理有一定意义.宜宾地震后余震频发,安置在珙县五同村斜坡不同位置的强震监测仪于2020年9月6日成功监测到MS3.1级余震,通过各监测点之间实测地震动数据相应的比较发现:与位于一级台阶处的...

ANALYSIS OF SEISMIC RESPONSE TO GENTLE STEPPED ROCK SLOPE

It is of great significance to analyze the seismic shaking conditions of coseismic rock avalanches in Gong County area. The area is just located in gentle stepped rock slope of hilly area of south Sichuan Province. A set of seismic stations,located into Wutong village of Gong County,captured a M_S3.1 earthquake. Based on the captured seismic data,a series of analysis are carried out. The results show the upper stepped rock mass can produce larger site amplification and resonance amplification than the lower stepped rock. Due to the development of fissures and joints in cliff,the PGA and Arias of inner section of the upper stepped rock reduced 1.73 and 2.20 compared to the cliff section. This indicates that cliff exists site amplification effect. The seismic duration of the inner section of the upper stepped rock(convex terrain) is 1.25 times of the referred point(the lower stepped rock and the concave terrain). This indicates that micro topography has seismic duration amplification.