Assessment of seismic amplification factor of excavation with support system

2019 ◽  
Vol 18 (3) ◽  
pp. 555-566 ◽  
Author(s):  
Hamidreza Tavakoli ◽  
Saman Soleimani Kutanaei ◽  
Seyed Hossein Hosseini
Keyword(s):  
Support System ◽  
Amplification Factor ◽  
Seismic Amplification

scholarly journals The slope seismic response monitoring of Wenchuan aftershocks in Qingchuan

2014 ◽  
Vol 2 (6) ◽  
pp. 4135-4161
Author(s):  
Y. H. Luo ◽  
R. Huang ◽  
Y. Wang
Keyword(s):  
Seismic Response ◽  
Amplification Factor ◽  
Epicentral Distance ◽  
Spectral Ratio ◽  
Response Monitoring ◽  
Sufficient Evidence ◽  
2008 Wenchuan Earthquake ◽  
Amplification Effect ◽  
Acceleration Amplification ◽  
Seismic Amplification

Abstract. This work reports some new progress of rock slope inside seismic response monitoring results in the area of Mountain Dong and Mountain Shizi (Qingchuan county), located more than 250 km NE of Yingxiu epicenter (2008 Wenchuan earthquake), Sichuan province. Five adits with the maximum depth of 15 m had been excavated in different elevation on both sides slope. Stations were emplaced at middle of the adits, from September 2009 to May 2010 more than 60 Wenchuan aftershocks had been monitored, 22 typical aftershocks had been analysis, whose magnitude varied between 2.3 ~ 5.2 and epicentral distance was from a few to 45 km. A comparison analysis of recordings provided evidence of the presence amplification effect at the Q4 station of Mt. Dong, which the peak horizontal acceleration amplification factor is between 1.0 ~ 2.5. But this amplification effect had no stronger at other stations. Comprehensive studies show that the relative height to riverbed is an important factor of Q4 seismic amplification effect. Otherwise the topography of Q4 site is conducive to horizontal amplification, not the vertical amplification. Moreover the calculation of Arias intensity (Ia) had the same amplification effect as the PGA, only the amplification factor is between 1.0 ~ 3.47 much bigger than the latter. On the other hand, the calculation of horizontal to vertical spectral ratio (HVSR) at Q4 shows the curves have multiple peaks corresponding with different dominant frequencies, which the amplification factor is always bigger than other stations at Mt. Dong. Sufficient evidence indicates that the Mt. Dong amplification effect is stronger than Mt. Shizi.

Seismic Microzonation and Site Effects Detection Through Microtremors Measures

2018 ◽  
pp. 326-349
Author(s):  
Francisco Alberto Calderon ◽  
Emilce Gisela Giolo ◽  
Carlos Daniel Frau ◽  
Marcelo Gerardo Jesús Guevara Rengel ◽  
Hernan Rodriguez ◽  
...  
Keyword(s):  
Site Effects ◽  
Amplification Factor ◽  
Seismic Microzonation ◽  
Poor Countries ◽  
Advantages And Disadvantages ◽  
Cheap Method ◽  
Hvsr Method ◽  
Seismic Amplification ◽  
Fundamental Reason ◽  
Well Correlation

Seismic microzonation of a city can be a difficult and expensive undertaking depending on the method used. In the last years, the HVSR method has been one of the most popular ways to define the natural frequency of the soil and seismic amplification factor in order to make quick microzonations due to that it is an expeditious and cheap method. This is very important in developing countries and poor countries. The fundamental reason to use this method is the fact that the amplification factor has well correlation with damage distribution. Additionally with the help of another methods it is possible obtain the structure of the superficial soil strata. In this chapter, an introduction with seismic microzonation, site effects concepts, microtremors, description of the HVSR method, advantages and disadvantages of this method, limitations and comparison with other methods, are presented. Finally, highlight of the importance of the method in order to identify site effects are displayed as examples and the incorporation of these data to Geographic Information Systems is also shown.

scholarly journals Seismic Amplification by Deep Subsurface and Proposal of a New Proxy

2020 ◽  
Vol 10 (1) ◽  
pp. 5157-5163 ◽  
Author(s):  
T. Nagao
Keyword(s):  
Wave Velocity ◽  
Amplification Factor ◽  
Ground Surface ◽  
Strong Motion ◽  
Observation System ◽  
S Wave ◽  
Deep Subsurface ◽  
Shallow Subsurface ◽  
Codes Of Practice ◽  
Seismic Amplification

Codes of practice and ground motion prediction equations involve ground structure proxies to account for seismic amplification. Although the ground consists of both shallow and deep subsurface, proxies are mainly related to the shallow subsurface as it is shallow subsurface information that is mostly available. However, as deep subsurface seismic amplification is not negligible, it may not be appropriate to use shallow subsurface proxies. In this study, the relationship between shallow and deep subsurface seismic amplification factors is discussed on the basis of S-wave velocity profile data from Japanese KiK-net strong-motion observation system stations. The correlation between typical proxies such as the average S-wave velocity of the top 30m of the ground surface and the seismic amplification factor was examined. Although there was a negative correlation between the two, the degree of the correlation was weak. A new proxy showing stronger correlations with the seismic amplification factor is proposed and its effectiveness is demonstrated.

Empirical Formula for Calculating Maximum Acceleration of Concrete-Faced Rockfill Dam

2011 ◽  
Vol 243-249 ◽  
pp. 4557-4563
Author(s):  
Hui Zhou ◽  
Jun Jie Li ◽  
Fei Kang
Keyword(s):  
Empirical Equation ◽  
Amplification Factor ◽  
Seismic Intensity ◽  
River Valley ◽  
Seismic Stability ◽  
Maximum Acceleration ◽  
Rockfill Dam ◽  
Seismic Amplification ◽  
Different Shapes ◽  
Equivalent Linear Model

On the condition of different dam heights and different shapes of river valley, 3-D dynamical responses of concrete-faced rockfill dams subjected to different seismic intensity input are analyzed based on equivalent-linear model in this paper. The results show that on the condition of the same dam height and the base acceleration excitations unchanged, the position of the maximum acceleration on the axis of the top moves from the middle to the riversides symmetrically with the increase of the river valley width. For the narrow river valley, the position of the maximum acceleration which occurs near the riversides to the wide valley is on the middle of the axis at the top. The result negates the application of 2-D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic amplification factor along the axis should be given, except for that along the dam heights. Statistical analysis is also made to the seismic coefficient, and an empirical equation for calculating the maximum acceleration of the dam is provided, which provide an reference for the seismic stability analysis of rockfill dams using pseudo-static method.

scholarly journals MzS Tools: GIS Methods and Tools for Seismic Microzonation Mapping

2021 ◽  
Author(s):  
Giuseppe Cosentino ◽  
Francesco Pennica ◽  
Emanuele Tarquini ◽  
Giuseppe Cavuoto ◽  
Francesco Stigliano
Keyword(s):  
Amplification Factor ◽  
Data Entry ◽  
National Research Council ◽  
Seismic Microzonation ◽  
Database Management System ◽  
Structural Elements ◽  
Software Environment ◽  
Seismic Amplification ◽  
Gis Methods ◽  
Relational Database Management

MzSTools is a plugin for QGIS developed by the National Research Council (CNR) as part of the activities concerning the coordination of seismic microzonation studies in Italy. It train from the need to create a practical and easy-to-use tool to carry out seismic microzonation (SM) studies by producing standards compliant geographic database and maps, thus making them accurate, homogeneous and uniform for all municipalities in Italy. A geodatabase based on SQLite/SpatiaLite Relational Database Management System (RDBMS). It has been designed to collect and store data related to elements such as: geognostic surveys; bedrocks and cover terrains; superficial and buried geomorphological elements; tectonic-structural elements; elements of geological instability such as landslide zones, liquefaction zones and zones affected by active and capable faults; homogeneous microzones in seismic perspective, microzones characterized by a seismic amplification factor. The QGIS plugin provides tools such as data entry forms designed with Qt Designer; a QGIS project template with layers, symbol libraries and graphic styles; layouts for the SM Maps. MzSTools assembles in a single software environment a set of useful tools for those who work in. The plugin is open source, whose code hosted on the GitHub platform, and is published via the official QGIS plugins repository (https://plugins.qgis.org/plugins/MzSTools/).

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