Контрольная Работа На Тему Seismic Methods
Контрольная Работа На Тему Seismic Methods
There is an increasing requirement for geo- physical surveys carried out during geotechnical investigations to provide direct information about rock quality or other geotechnical para- meters. With the paucity of information to cor- relate geophysical results with actual rock prop- erties, this is still difficult to achieve and addi- tional research effort needs to be performed to address this issue. Nowadays, several research- ers have been described detailed studies which designed specifically to investigate this matter. Generally, geophysical techniques which are used to estimate seismic velocities in the subsur- face focus on the low strain levels that are not large enough to induce significant nonlinear, nonelastic stress-strain behavior (Luna and Jadi, 2000), which is normally evaluated when ad- dressing liquefaction potential of soils in the shallow subsurface. Soil parameters relevant to seismic ground response (Rechtien, 1996) are density, relative density and void ratio, perme- ability, shear modulus, water saturation, soil fabric and stress history. Detailed characteriza- tion of elastic properties near a major construc- tion site (e.g. a bridge) is useful for near field dynamic analysis of soil-structure interaction (SSI) effects. The coupled effect of the bridge foundation (piles, piers or abutments) and the soil immediately surrounding these substructure elements is essential for dynamic SSI analysis of these critical bridge structures. This paper presents a geophysical investiga- tion performed along the under construction highway of Egnatia Odos, approximately 13 km west from the town of Xanthi in N. Greece. Twelve geotechnical boreholes, drilled at the maximum depth of 75 m, approximately located 20 m from the Nestos River. The objective of the survey was to obtain the high-resolution compressional and shear wave velocities of the shallow subsurface for computation of elastic engineering properties of the unconsolidated material interposed between the investigated boreholes. Joint interpretation of borehole logs and velocity images obtained by P- and S-wave traveltime inversions outlined shallow geologi- cal anomalies.
Map of Greece showing the area of the foundation of Nestos Bridge. A geological map of the site with the main formations is also presented.
Detection of S-waves arrival using the conventional method of overlapping waveforms as recorded from horizontals and vertical component. It is obviously that the vertical component, receive the S-wave energy better than the horizontal components.
Picking of P and S-waves arrival applying the particle motion diagrams.
1D velocity model for CH3 and its correlation with geological formations identified from the borehole.
Topography map of the study area showing the location of the wells, presented with black circles. A total number of 12 boreholes were used for the experiment.
Content may be subject to copyright.
Content may be subject to copyright.
International Workshop in “Geoenvironment and 1
Geotechnics”, September 2005, Milos island, Greece
Application of seismic methods for geotechnical site characterization
Technological Educational Institute of Crete, Department of Natural Resources & Environment,
Laboratory of Geophysics & Seismology, Hania, Greece
C.B. Papazachos, G. Vargemezis and I. Fikos
Geophysical Laboratory, Aristotle University of Thessaloniki, Macedonia, Greece
There is an increasing requirement for geo-
physical surveys carried out during geotechnical
investigations to provide direct information
about rock quality or other geotechnical para-
meters. With the paucity of information to cor-
relate geophysical results with actual rock prop-
erties, this is still difficult to achieve and addi-
tional research effort needs to be performed to
address this issue. Nowadays, several research-
ers have been described detailed studies which
designed specifically to investigate this matter.
Generally, geophysical techniques which are
used to estimate seismic velocities in the subsur-
face focus on the low strain levels that are not
large enough to induce significant nonlinear,
nonelastic stress-strain behavior (Luna and Jadi,
2000), which is normally evaluated when ad-
dressing liquefaction potential of soils in the
shallow subsurface. Soil parameters relevant to
seismic ground response (Rechtien, 1996) are
density, relative density and void ratio, perme-
ability, shear modulus, water saturation, soil
fabric and stress history. Detailed characteriza-
tion of elastic properties near a major construc-
tion site (e.g. a bridge) is useful for near field
dynamic analysis of soil-structure interaction
(SSI) effects. The coupled effect of the bridge
foundation (piles, piers or abutments) and the
soil immediately surrounding these substructure
elements is essential for dynamic SSI analysis
of these critical bridge structures.
This paper presents a geophysical investiga-
tion performed along the under construction
highway of Egnatia Odos, approximately 13 km
west from the town of Xanthi in N. Greece.
Twelve geotechnical boreholes, drilled at the
maximum depth of 75 m, approximately located
20 m from the Nestos River. The objective of
the survey was to obtain the high-resolution
compressional and shear wave velocities of the
shallow subsurface for computation of elastic
engineering properties of the unconsolidated
material interposed between the investigated
boreholes. Joint interpretation of borehole logs
and velocity images obtained by P- and S-wave
traveltime inversions outlined shallow geologi-
The seismic method is a powerful geophysical
exploration technique that has been in wide-
spread use in ground engineering for more than
40 years and has been increasingly used since
1996 in geotechnical and environmental
applications, usually at depths shallower than 40
meters. The applicability of seismic methods
depends on the presence of acoustical contrasts
in the subsurface. In many cases the acoustical
contrasts occur at boundaries between geologi-
cal layers, although man-made boundaries such
as tunnels and mines also present contrasts.
Seismic survey is the geophysical method,
which is most closely related to rock and soil
mass properties, since seismic wave velocity
varies with the main mechanical properties,
such as Poisson’s ratios and others modules.
The earliest applications of the method primar-
ily concerned the determination of the depth to
bedrock beneath a soil cover. Later, the same
method was used successfully for the location of
“weak” zones, such as shear zones and faults.
Nowadays, seismic methods have been used in
connection with planning of dams (e.g. Klimis
... (1) Seismic, geophysical method that studies the properties of the soil mass of rock's influence is impossible to seismic waves as the main mechanical properties such as Poisson's ratio and other modules is obtained. (2) The application of geophysical methods in the study of Earth hazards such as earthquakes, landslides, etc. is increasing. (3) To assess stiffness after shear wave velocity, seismic site response, liquefaction potential, calibration location, soil stratigraphy, foundation and foundation settlement is necessary and useful. ...
... The results obtained from the geophysical investigation the results obtained will be used for acquisition of the geotechnical data, which would serve as the control for the entire subsurface characterization. According to Soupios, et al. [1], there is an increasing requirement for geophysical surveys conducted during geotechnical investigations so as to provide direct information about rock/soil quality and other geotechnical parameters that will be useful in correlating geophysical results with actual rock/soil properties. Bery and Saad [2] together with Karaman and Kesimal [3] proved that it is possible to study the P-wave velocities of materials both in the laboratory and the field. ...
... The results obtained from the geophysical investigation would be checked against the results of the geotechnical method, which would serve as the control for the entire subsurface characterization. According to Soupios, et al. [1], there is an increasing requirement for geophysical surveys conducted during geotechnical investigations so as to provide direct information about rock/soil quality and other geotechnical parameters that will be useful in correlating geophysical results with actual rock/soil properties. ...
Using a high power grounded dipole and surface and borehole receivers
The main purpose of the project is to check if biochar is suitable for textile wastewater and olive oil mill wastes treatment and SIP is sensitive to the remediation processes and can give signific ... [more]
The main purpose of this project is the use and integration of different geophysical methods, such as HVSR, MAM/MASW, special seismic arrays, TEM/AMT/CSAMT soundings with known geophysical and geol ... [more]
January 1990 · European Journal of Mineralogy
Levyclaudite, with simplified formula Pb8Sn7Cu3(Bi,Sb)3 S28, has been discovered in a sample from a drill hole in the Aghios Philippos Pb-Zn deposit (Kirki district, Greece). Associated sulphides are pyrite, sphalerite and kirkiite, with subordinated galena, tennantite and kesterite. The mineralogical, crystallographic and optical properties of levyclaudite are described. This mineral is named in ... [Show full abstract]
As part of a research project looking at the use of resources in Chalcolithic settlements in the region surrounding the site of Valencina de la Concepción, in the lower Guadalquivir Basin (Seville province, SW Spain) a new site named La Loma del Real Tesoro (henceforth LRT) is being investigated. It consists of two different sectors with LRT-I measuring 6ha and LRT-II 8ha. In 2015 and 2016 LRT-II ... [Show full abstract]
In the aftermath of the 2008 financial crisis a number of Eurozone countries, Cyprus, Greece, Ireland, Portugal and Spain faced significant balance of payments difficulties requiring severe domestic adjustments combined with support from the Eurozone and the IMF. As of 2017 the adjustment programs had been completed in all these countries except Greece. The chapter summarizes the origins of the ... [Show full abstract]
Douro River is one of the Iberian Peninsula's largest rivers, crossing east to west Portugal's northern territory, being of the utmost importance for this region's socio-economic development. For thirty years the navigation in the Portuguese territory has been established with the construction of several dams, and fluvial quays have been built, as Sabrosa's fluvial quay, located in the right bank ... [Show full abstract]
© 2008-2020 ResearchGate GmbH. All rights reserved.
Application of seismic methods for geotechnical site characterization
Seismic Methods | SpringerLink
Seismic Method - an overview | ScienceDirect Topics
Assessment of seismic safety for construction sites of earth dams
Seismic refraction modeling using finite difference method and its...
Реферат По Физре На Любую Тему
Трансакционный Анализ Реферат
Ожоговый Шок Реферат
Собрание Сочинений Сталина Скачать Бесплатно
Сочинение На Тему Время 9 Класс